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<h1 id="api-general-sensors">API - General Sensors<a class="headerlink" href="#api-general-sensors" title="Permanent link">&para;</a></h1>
<p>In this section the Python API reference for diverse sensors is described. This library is supported on both major versions
of Python: 2.x and 3.x.</p>
<p>In this section, the API for the following sensors is described:</p>
<ul>
<li><a href="http://wiki.seeedstudio.com/Grove-Temperature_Sensor_V1.2/">Grove Temperature Sensor</a></li>
<li><a href="https://www.seeedstudio.com/Grove-Ultrasonic-Ranger-p-960.html">Grove Ultrasonic Sensor</a></li>
<li><a href="http://wiki.seeedstudio.com/Grove-TemperatureAndHumidity_Sensor/">DHT11</a></li>
<li><a href="http://wiki.seeedstudio.com/Grove-Temperature_and_Humidity_Sensor_Pro/">DHT22</a></li>
<li><a href="https://www.seeedstudio.com/Grove-Infrared-Receiver-p-994.html">Grove IR Receiver</a> necessary for the <a href="https://www.dexterindustries.com/shop/infrared-remote/">Infrared Remote</a></li>
</ul>
<hr />
<p><strong>IMPORTANT</strong></p>
<p>This library and the other ones too are not thread-safe. You cannot call the GrovePi from multiple threads or processes
as that will put the GrovePi into a broken state.</p>
<p>In case you need to reset the GrovePi from your Raspberry Pi, <a href="../fw/#resetting-the-grovepi">check this section</a>.</p>
<p>The functions don't verify if the input parameters are valid and therefore the parameters have to be verified/validated before that.
Calling a function with improper parameters can result in an undefined behavior for the GrovePi.</p>
<hr />
<h2 id="grovepitemppin-model10"><code>grovepi.temp(pin, model='1.0')</code><a class="headerlink" href="#grovepitemppin-model10" title="Permanent link">&para;</a></h2>
<p>Read temperature from the <a href="http://wiki.seeedstudio.com/Grove-Temperature_Sensor_V1.2/">Grove Temperature Sensor</a> on the GrovePi.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> a number to identify the port (A0-A2) from which to do the reading</li>
<li><code>model {String}</code> <code>"1.0"</code>, <code>"1.1"</code>, <code>"1.2"</code> depending on the used model</li>
</ul>
<p><strong>Returns</strong>: <code>{Float}</code> number to represent the temperature in ºC</p>
<hr />
<h2 id="grovepiultrasonicreadpin"><code>grovepi.ultrasonicRead(pin)</code><a class="headerlink" href="#grovepiultrasonicreadpin" title="Permanent link">&para;</a></h2>
<p>Read the distance to an object with the <a href="https://www.seeedstudio.com/Grove-Ultrasonic-Ranger-p-960.html">Grove Ultrasonic Sensor</a> on the GrovePi.
The closer it is to the targeted object, the faster the sample rate and slower when it's farther.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> a number to identify the port (D2-D8) from which to do the reading</li>
</ul>
<p><strong>Returns</strong>: <code>{Integer}</code> number to represent the distance to the object in centimeters</p>
<hr />
<h2 id="grovepiversion"><code>grovepi.version()</code><a class="headerlink" href="#grovepiversion" title="Permanent link">&para;</a></h2>
<p>Read the version of the firmware.</p>
<p><strong>Returns</strong>: a <code>{String}</code> representing the firmware version (i.e. <code>"1.2.7"</code>)</p>
<hr />
<h2 id="grovepidhtpin-module_type"><code>grovepi.dht(pin, module_type)</code><a class="headerlink" href="#grovepidhtpin-module_type" title="Permanent link">&para;</a></h2>
<p>Read the temperature and humidity on the GrovePi with one of the given modules.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> a number to identify the port (D2-D8) from which to do the reading</li>
<li>
<p><code>module_type {Integer}</code> a number to identify the model</p>
<ul>
<li><code>0</code> for <a href="http://wiki.seeedstudio.com/Grove-TemperatureAndHumidity_Sensor/">DHT11</a></li>
<li><code>1</code> for <a href="http://wiki.seeedstudio.com/Grove-Temperature_and_Humidity_Sensor_Pro/">DHT22</a></li>
<li><code>2</code> for DHT21</li>
<li><code>3</code> for AM2301</li>
</ul>
</li>
</ul>
<p><strong>Returns</strong>: a <code>{(Float, Float}</code> list where the 1st parameter is the temperature in ºC and the 2nd one is the humidity as a percentage.</p>
<p><strong>On Error</strong>: it returns a <code>{(Float, Float)}</code> list containing <code>NaN</code>s. This happens when the sensor can't keep up with the demanded sample rate.</p>
<hr />
<h2 id="grovepiir_read_signal"><code>grovepi.ir_read_signal()</code><a class="headerlink" href="#grovepiir_read_signal" title="Permanent link">&para;</a></h2>
<p>Get the decoded value from the <a href="https://www.seeedstudio.com/Grove-Infrared-Receiver-p-994.html">Grove IR Receiver</a>. For this you need to use a remote control of any kind. The preferred one we use is the <a href="https://www.dexterindustries.com/shop/infrared-remote/">Infrared Remote</a>.</p>
<p>In order to use this function, you first need to call <a href="#grovepiir_recv_pinpin">grovepi.ir_recv_pin</a> function to bind the functionality to a given port.</p>
<p><strong>Parameters</strong>: None</p>
<p><strong>Returns</strong>: a 3-element list of this form <code>{(Integer, Integer, Integer)}</code></p>
<ul>
<li>
<p>The 1st element keeps an <code>{Integer}</code> corresponding to a certain brand:</p>
<ul>
<li><code>-1</code> for unknown and <code>0</code> for unused</li>
<li>RC2, RC5, NEC, SONY, PANASONIC, JVC, SAMSUNG, WHYNTER, AIWA_RC_T501, LG, SANYO, MITSUBISHI, DISH, SHARP, DENON, PRONTO, LEGO_PF having values from <code>1</code> to <code>17</code></li>
</ul>
</li>
<li>
<p>The 2nd element is a 16-bit address used by some Panasonic and Sharp remotes</p>
</li>
<li>The 3rd element is the 32-bit decoded value that can be used to identify which buttons were pressed - since there's no map for them you need to do it on a case-by-case basis</li>
</ul>
<hr />
<h2 id="grovepiir_recv_pinpin"><code>grovepi.ir_recv_pin(pin)</code><a class="headerlink" href="#grovepiir_recv_pinpin" title="Permanent link">&para;</a></h2>
<p>Enable the <a href="https://www.seeedstudio.com/Grove-Infrared-Receiver-p-994.html">Grove IR Receiver</a> on a given port. Used in conjunction with <a href="#grovepiir_read_signal">grovepi.ir_read_signal</a> and <a href="#grovepiir_is_data">grovepi.ir_is_data</a>.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> The port (D2-D8) to which the IR receiver gets connected to</li>
</ul>
<p><strong>Returns</strong>: None</p>
<hr />
<h2 id="grovepiir_is_data"><code>grovepi.ir_is_data()</code><a class="headerlink" href="#grovepiir_is_data" title="Permanent link">&para;</a></h2>
<p>Checks if there's available data coming from the <a href="https://www.seeedstudio.com/Grove-Infrared-Receiver-p-994.html">Grove IR Receiver</a>. Used in conjunction with <a href="#grovepiir_read_signal">grovepi.ir_read_signal</a> function.</p>
<p><strong>Parameters</strong>: None</p>
<p><strong>Returns</strong>: <code>True</code> or <code>False</code></p>
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<h1 id="api-gpio-functions">API - GPIO Functions<a class="headerlink" href="#api-gpio-functions" title="Permanent link">&para;</a></h1>
<p>In this section the Python API reference for GPIO functions is described. This library is supported on both major versions
of Python: 2.x and 3.x.</p>
<hr />
<p><strong>IMPORTANT</strong></p>
<p>This library and the other ones too are not thread-safe. You cannot call the GrovePi from multiple threads or processes
as that will put the GrovePi into a broken state.</p>
<p>In case you need to reset the GrovePi from your Raspberry Pi, <a href="../fw/#resetting-the-grovepi">check this section</a>.</p>
<p>The functions don't verify if the input parameters are valid and therefore the parameters have to be verified/validated before that.
Calling a function with improper parameters can result in an undefined behavior for the GrovePi.</p>
<hr />
<h2 id="grovepidigitalreadpin"><code>grovepi.digitalRead(pin)</code><a class="headerlink" href="#grovepidigitalreadpin" title="Permanent link">&para;</a></h2>
<p>Reads whether a port's input is set high or low on the GrovePi.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> a number to identify the port (D2-D8) from which to do the reading</li>
</ul>
<p><strong>Returns</strong>: <code>0</code> or <code>1</code> depending on the input value</p>
<hr />
<h2 id="grovepidigitalwritepin-value"><code>grovepi.digitalWrite(pin, value)</code><a class="headerlink" href="#grovepidigitalwritepin-value" title="Permanent link">&para;</a></h2>
<p>Sets the output value to either <code>0</code> or <code>1</code> to a digital port on the GrovePi.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> a number to identify the port (D2-D8) to which to do the writing</li>
<li><code>value {Integer}</code> either <code>0</code> for 0 volts or <code>1</code> for maximum output voltage (usually 5 volts)</li>
</ul>
<p><strong>Returns</strong>: <code>1</code> all the time</p>
<hr />
<h2 id="grovepianalogreadpin"><code>grovepi.analogRead(pin)</code><a class="headerlink" href="#grovepianalogreadpin" title="Permanent link">&para;</a></h2>
<p>Detect an input voltage as a value from a given port on the GrovePi.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> a number to identify the port (A0-A2) from which to do the reading</li>
</ul>
<p><strong>Returns</strong>: a 10-bit <code>{Integer}</code> number that maps to the input voltage on the port</p>
<hr />
<h2 id="grovepianalogwritepin-value"><code>grovepi.analogWrite(pin, value)</code><a class="headerlink" href="#grovepianalogwritepin-value" title="Permanent link">&para;</a></h2>
<p>Set an output voltage on a PWM-enabled port by mapping the value to the desired voltage on the GrovePi.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> a number to identify the port (ports 3, 5, 6, 9) to which to do the writing</li>
<li><code>value {Integer}</code> an 8-bit number that maps from 0V to the referenced voltage of the GrovePi (5V)</li>
</ul>
<p><strong>Returns</strong>: <code>1</code> all the time</p>
<hr />
<h2 id="grovepipinmodepin-mode"><code>grovepi.pinMode(pin, mode)</code><a class="headerlink" href="#grovepipinmodepin-mode" title="Permanent link">&para;</a></h2>
<p>Sets a port to be either an OUTPUT or an INPUT port on the GrovePi.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> a number to identify the port (D2-D8) to which to do the change</li>
<li><code>mode {String}</code> <code>"OUTPUT"</code> for writing values or <code>"INPUT"</code> for reading</li>
</ul>
<p><strong>Returns</strong>: <code>1</code> all the time</p>
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Interrupt-Based Devices
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<a href="#grovepiset_pin_interruptpin-ftype-interrupt_mode-period" title="grovepi.set_pin_interrupt(pin, ftype, interrupt_mode, period)" class="md-nav__link">
grovepi.set_pin_interrupt(pin, ftype, interrupt_mode, period)
</a>
</li>
<li class="md-nav__item">
<a href="#grovepiunset_pin_interruptpin" title="grovepi.unset_pin_interrupt(pin)" class="md-nav__link">
grovepi.unset_pin_interrupt(pin)
</a>
</li>
<li class="md-nav__item">
<a href="#grovepiunset_all_interrupts" title="grovepi.unset_all_interrupts()" class="md-nav__link">
grovepi.unset_all_interrupts()
</a>
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<li class="md-nav__item">
<a href="#grovepiis_interrupt_activepin" title="grovepi.is_interrupt_active(pin)" class="md-nav__link">
grovepi.is_interrupt_active(pin)
</a>
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<li class="md-nav__item">
<a href="#grovepiget_active_interrupts" title="grovepi.get_active_interrupts()" class="md-nav__link">
grovepi.get_active_interrupts()
</a>
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<li class="md-nav__item">
<a href="#grovepiread_interrupt_statepin" title="grovepi.read_interrupt_state(pin)" class="md-nav__link">
grovepi.read_interrupt_state(pin)
</a>
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<a href="#grovepidust_sensor_enpin-2-period-30000" title="grovepi.dust_sensor_en(pin = 2, period = 30000)" class="md-nav__link">
grovepi.dust_sensor_en(pin = 2, period = 30000)
</a>
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<a href="#grovepidust_sensor_dispin-2" title="grovepi.dust_sensor_dis(pin = 2)" class="md-nav__link">
grovepi.dust_sensor_dis(pin = 2)
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<a href="#grovepidust_sensor_readpin-2-period-30000" title="grovepi.dust_sensor_read(pin = 2, period = 30000)" class="md-nav__link">
grovepi.dust_sensor_read(pin = 2, period = 30000)
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<a href="#grovepiencoder_enpin-2-steps-32" title="grovepi.encoder_en(pin = 2, steps = 32)" class="md-nav__link">
grovepi.encoder_en(pin = 2, steps = 32)
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grovepi.encoder_dis(pin = 2)
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grovepi.flowEnable(pin = 2, period = 2000)
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grovepi.flowDisable(pin = 2)
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grovepi.flowRead(pin = 2)
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<a href="#grovepiset_pin_interruptpin-ftype-interrupt_mode-period" title="grovepi.set_pin_interrupt(pin, ftype, interrupt_mode, period)" class="md-nav__link">
grovepi.set_pin_interrupt(pin, ftype, interrupt_mode, period)
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grovepi.is_interrupt_active(pin)
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grovepi.get_active_interrupts()
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<a href="#grovepiread_interrupt_statepin" title="grovepi.read_interrupt_state(pin)" class="md-nav__link">
grovepi.read_interrupt_state(pin)
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<a href="#grovepidust_sensor_enpin-2-period-30000" title="grovepi.dust_sensor_en(pin = 2, period = 30000)" class="md-nav__link">
grovepi.dust_sensor_en(pin = 2, period = 30000)
</a>
</li>
<li class="md-nav__item">
<a href="#grovepidust_sensor_dispin-2" title="grovepi.dust_sensor_dis(pin = 2)" class="md-nav__link">
grovepi.dust_sensor_dis(pin = 2)
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<li class="md-nav__item">
<a href="#grovepidust_sensor_readpin-2-period-30000" title="grovepi.dust_sensor_read(pin = 2, period = 30000)" class="md-nav__link">
grovepi.dust_sensor_read(pin = 2, period = 30000)
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<a href="#grovepiencoder_enpin-2-steps-32" title="grovepi.encoder_en(pin = 2, steps = 32)" class="md-nav__link">
grovepi.encoder_en(pin = 2, steps = 32)
</a>
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<a href="#grovepiencoder_dispin-2" title="grovepi.encoder_dis(pin = 2)" class="md-nav__link">
grovepi.encoder_dis(pin = 2)
</a>
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<a href="#grovepiencoderreadpin-2" title="grovepi.encoderRead(pin = 2)" class="md-nav__link">
grovepi.encoderRead(pin = 2)
</a>
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<a href="#grovepiflowenablepin-2-period-2000" title="grovepi.flowEnable(pin = 2, period = 2000)" class="md-nav__link">
grovepi.flowEnable(pin = 2, period = 2000)
</a>
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<a href="#grovepiflowdisablepin-2" title="grovepi.flowDisable(pin = 2)" class="md-nav__link">
grovepi.flowDisable(pin = 2)
</a>
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grovepi.flowRead(pin = 2)
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<h1 id="api-interrupt-based-devices">API - Interrupt-Based Devices<a class="headerlink" href="#api-interrupt-based-devices" title="Permanent link">&para;</a></h1>
<p>In this section the Python API reference for interrupt-based devices is described. This library is supported on both major versions
of Python: 2.x and 3.x.</p>
<p>The API for the following sensors is described in this section:</p>
<ul>
<li><a href="https://www.seeedstudio.com/Grove-Dust-Sensor%EF%BC%88PPD42NS%EF%BC%89-p-1050.html">Grove Dust Sensor</a></li>
<li><a href="https://www.seeedstudio.com/Grove-Encoder-p-1352.html">Grove Encoder</a></li>
<li><a href="https://www.seeedstudio.com/M11%2A1.25-Water-Flow-Sensor-p-1345.html">Grove Water Flow Sensor</a> of whose functionality can be used in other applications too</li>
</ul>
<p>Apart from describing the API for the above sensors, there is also described a set of functions used to set interrupt events on the GrovePi. These functions are like the building blocks of the API of the above sensors and can be used for your own implementation, should it be applicable to your device.</p>
<hr />
<p><strong>IMPORTANT</strong></p>
<p>This library and the other ones too are not thread-safe. You cannot call the GrovePi from multiple threads or processes
as that will put the GrovePi into a broken state.</p>
<p>In case you need to reset the GrovePi from your Raspberry Pi, <a href="../../fw/#resetting-the-grovepi">check this section</a>.</p>
<p>The functions don't verify if the input parameters are valid and therefore the parameters have to be verified/validated before that.
Calling a function with improper parameters can result in an undefined behavior for the GrovePi.</p>
<hr />
<h2 id="grovepiset_pin_interruptpin-ftype-interrupt_mode-period"><code>grovepi.set_pin_interrupt(pin, ftype, interrupt_mode, period)</code><a class="headerlink" href="#grovepiset_pin_interruptpin-ftype-interrupt_mode-period" title="Permanent link">&para;</a></h2>
<p>Attach an interrupt event to a port.</p>
<p>Can be used to count pulses, duration of pulses, set different kinds of trigger modes (on change, rising or falling edges) all done within a given time period.</p>
<p>If there are subsequent calls to this set function without detaching the interrupt event first from a given pin, then it will overwrite the old setting and update it to reflect the latest one.</p>
<p>Also, setting this up disables the OUTPUT functionality on the selected pin. If the selected pin has to drive the output, then detach the interrupt event with <a href="#grovepiunset_pin_interruptpin">grovepi.unset_pin_interrupt</a>.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> can be pins D2-D8 to which the device is connected to</li>
<li><code>ftype {Integer}</code> the type of event/operation associated for the given pin. Can take values <code>grovepi.COUNT_CHANGES</code> (for counting the number of triggers) or <code>grovepi.COUNT_LOW_DURATION</code> (which measures how much time the signal stays low in a given period).</li>
<li><code>interrupt_mode {Integer}</code> triggering mode of the interrupt. It can be <code>grovepi.CHANGE</code>, <code>grovepi.FALLING</code> or <code>grovepi.RISING</code>, just like on the Arduino.</li>
<li><code>period {Integer}</code> specifying after how long the recorded value should be stored on the GrovePi to be subsequently read on the master device (Raspberry Pi). Measured in milliseconds. Minimum value shouldn't be too small (say under <em>5 ms</em>) and the maximum value is <em>65535 ms</em>.</li>
</ul>
<p><strong>Returns</strong>: None</p>
<hr />
<h2 id="grovepiunset_pin_interruptpin"><code>grovepi.unset_pin_interrupt(pin)</code><a class="headerlink" href="#grovepiunset_pin_interruptpin" title="Permanent link">&para;</a></h2>
<p>Detach an interrupt event from a given pin.</p>
<p>Necessary if you want to set output values to this pin with <a href="../gpio/#grovepidigitalwritepin-value">grovepi.digitalWrite</a> function.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> pins D2-D8 from which the interrupt is released from</li>
</ul>
<p><strong>Returns</strong>: None</p>
<hr />
<h2 id="grovepiunset_all_interrupts"><code>grovepi.unset_all_interrupts()</code><a class="headerlink" href="#grovepiunset_all_interrupts" title="Permanent link">&para;</a></h2>
<p>Detach all active interrupt events on all pins.</p>
<p><strong>Parameters</strong>: None</p>
<p><strong>Returns</strong>: None</p>
<hr />
<h2 id="grovepiis_interrupt_activepin"><code>grovepi.is_interrupt_active(pin)</code><a class="headerlink" href="#grovepiis_interrupt_activepin" title="Permanent link">&para;</a></h2>
<p>Check if a pin has an interrupt event associated.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> pin to check (D2-D8) if there's an associated interrupt event</li>
</ul>
<p><strong>Returns</strong>: <code>{Bool}</code> - <code>True</code> if it has an interrupt event associated and <code>False</code> if otherwise.</p>
<hr />
<h2 id="grovepiget_active_interrupts"><code>grovepi.get_active_interrupts()</code><a class="headerlink" href="#grovepiget_active_interrupts" title="Permanent link">&para;</a></h2>
<p>Get a list of all pins that have associated interrupt events.</p>
<p><strong>Parameters</strong>: None</p>
<p><strong>Returns</strong>: A list of integers representing the active pins that have interrupt events.</p>
<hr />
<h2 id="grovepiread_interrupt_statepin"><code>grovepi.read_interrupt_state(pin)</code><a class="headerlink" href="#grovepiread_interrupt_statepin" title="Permanent link">&para;</a></h2>
<p>Get the recorded value by the interrupt event on the given pin.</p>
<p>If an interrupt is set on pin D2 (D2 is taken as an example, it can be any other digital pin) with the type of operation set to <code>grovepi.COUNT_CHANGES</code> and mode of interrupt set to <code>grovepi.RISING</code> with a period set to <em>1000 ms</em>, then say if 567 rising edges are detected, then at the end of this period of <em>1000 ms</em>, this function will return for pin D2 value 567. And the returned value of this function on D2 pin will update every <em>1000 ms</em>, because that's the period that has been set for it. And the outcome varies depending on how the interrupt event is initially set.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> pin to check the recorded value for the associated interrupt event</li>
</ul>
<p><strong>Returns</strong>: <code>{Bool}</code> - <code>True</code> if it has an interrupt event associated and <code>False</code> if otherwise.</p>
<hr />
<h2 id="grovepidust_sensor_enpin-2-period-30000"><code>grovepi.dust_sensor_en(pin = 2, period = 30000)</code><a class="headerlink" href="#grovepidust_sensor_enpin-2-period-30000" title="Permanent link">&para;</a></h2>
<p>Enables the <a href="https://www.seeedstudio.com/Grove-Dust-Sensor%EF%BC%88PPD42NS%EF%BC%89-p-1050.html">Grove Dust Sensor</a>.</p>
<p>If there is another interrupt event set on this pin, calling this method will overwrite the previous setting. Check <a href="#grovepiset_pin_interruptpin-ftype-interrupt_mode-period">grovepi.set_pin_interrupt</a> to find out more. It's the same effect as with calling this after calling <a href="#grovepiencoder_enpin-2-steps-32">grovepi.encoder_en</a> or <a href="#grovepiflowenablepin-2-period-2000">grovepi.flowEnable</a>. </p>
<p>This function is the same as calling <code>set_pin_interrupt(pin, ftype=COUNT_LOW_DURATION, interrupt_mode=CHANGE, period=period)</code>.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> the pin (D2-D8) to which the dust sensor is assigned to</li>
<li><code>period {Integer}</code> refresh time frame for the dust sensor. Maximum value for this parameter is <em>65535</em> ms.</li>
</ul>
<p><strong>Returns</strong>: None</p>
<hr />
<h2 id="grovepidust_sensor_dispin-2"><code>grovepi.dust_sensor_dis(pin = 2)</code><a class="headerlink" href="#grovepidust_sensor_dispin-2" title="Permanent link">&para;</a></h2>
<p>Disables the <a href="https://www.seeedstudio.com/Grove-Dust-Sensor%EF%BC%88PPD42NS%EF%BC%89-p-1050.html">Grove Dust Sensor</a>.</p>
<p>To disable the dust sensor that sits on the given pin. It's the same as calling <a href="#grovepiunset_pin_interruptpin">unset_pin_interrupt</a> function. </p>
<p><em>This function will be removed from future versions and it's only kept for making the API backwards-compatible.</em></p>
<p><strong>Parameters</strong>:</p>
<ul>
<li><code>pin {Integer}</code> the pin (D2-D8) to which the dust sensor is connected to</li>
</ul>
<p><strong>Returns</strong>: None</p>
<hr />
<h2 id="grovepidust_sensor_readpin-2-period-30000"><code>grovepi.dust_sensor_read(pin = 2, period = 30000)</code><a class="headerlink" href="#grovepidust_sensor_readpin-2-period-30000" title="Permanent link">&para;</a></h2>
<p>Reads the low pulse occupancy of the <a href="https://www.seeedstudio.com/Grove-Dust-Sensor%EF%BC%88PPD42NS%EF%BC%89-p-1050.html">Grove Dust Sensor</a> in the given period of time as set with <a href="#grovepiset_pin_interruptpin-ftype-interrupt_mode-period">grovepi.set_pin_interrupt</a> function.</p>
<p><strong>Parameters</strong>: None</p>
<ul>
<li><code>pin {Integer}</code> - the pin (D2-D8) to which the dust sensor is connected to</li>
<li><code>period {Integer}</code> - refresh time frame for the dust sensor as set with <a href="#grovepiset_pin_interruptpin-ftype-interrupt_mode-period">grovepi.set_pin_interrupt</a> function. Maximum value for this parameter is <em>65535</em> ms.</li>
</ul>
<p><strong>Returns</strong>: <code>{(Integer, Float, Float)}</code> list</p>
<ul>
<li>1st element is the LPO time</li>
<li>the 2nd one is the percentage (LPO time divided by total period)</li>
<li>the 3rd is the concentration as measured in <em>pcs/283ml=0.01cf</em> where the particle size is over <em>1um</em></li>
</ul>
<p>The dust sensor's characteristics can be seen in the following graph.</p>
<p><img alt="Grove Dust Sensor Characteristics" src="../../img/dust_sensor_characteristics.jpg" /></p>
<hr />
<h2 id="grovepiencoder_enpin-2-steps-32"><code>grovepi.encoder_en(pin = 2, steps = 32)</code><a class="headerlink" href="#grovepiencoder_enpin-2-steps-32" title="Permanent link">&para;</a></h2>
<p>Enable the <a href="https://www.seeedstudio.com/Grove-Encoder-p-1352.html">Grove Encoder</a>.</p>
<p>If the pin already has an associated interrupt event, calling this method will overwrite the setting with the new change for the given pin.</p>
<p>Since the encoder needs two interrupt-enabled pins, when calling this function for a <em>pin</em>, it also attaches the next pin in line <em>pin + 1</em>. To see which pins have been attached, call <a href="#grovepiget_active_interrupts">get_active_interrupts</a> function.</p>
<p><strong>Parameters</strong>: </p>
<ul>
<li>
<p><code>pin {Integer}</code> the pin to which the encoder is connected to. It also attaches the pin right next up in its line <em>pin + 1</em>. Can be set for D2-D7 pins. Notice how the last one can't be used because there would have to be another pin available after it, but there isn't because it's the last one in the chain.</p>
</li>
<li>
<p><code>steps {Integer}</code> specifies the number of steps for the encoder</p>
</li>
</ul>
<p><strong>Returns</strong>: None</p>
<hr />
<h2 id="grovepiencoder_dispin-2"><code>grovepi.encoder_dis(pin = 2)</code><a class="headerlink" href="#grovepiencoder_dispin-2" title="Permanent link">&para;</a></h2>
<p>Disable the <a href="https://www.seeedstudio.com/Grove-Encoder-p-1352.html">Grove Encoder</a>.</p>
<p>Necessary if you want to set output values to this pin with <a href="../gpio/#grovepidigitalwritepin-value">grovepi.digitalWrite</a> function. It's the same as calling <a href="#grovepiunset_pin_interruptpin">unset_pin_interrupt</a> function for <em>pin</em> and <em>pin + 1</em>. </p>
<p><strong>Parameters</strong>:</p>
<ul>
<li><code>pin {Integer}</code> the pin (D2-D8) to which the flow sensor is connected to</li>
</ul>
<p><strong>Returns</strong>: None</p>
<hr />
<h2 id="grovepiencoderreadpin-2"><code>grovepi.encoderRead(pin = 2)</code><a class="headerlink" href="#grovepiencoderreadpin-2" title="Permanent link">&para;</a></h2>
<p>Read the data off of the <a href="https://www.seeedstudio.com/Grove-Encoder-p-1352.html">Grove Encoder</a>.</p>
<p><strong>Parameters</strong>:</p>
<ul>
<li><code>pin {Integer}</code> - the pin (D2-D7) to which the encoder is attached to.</li>
</ul>
<p><strong>Returns</strong>: <code>{Integer}</code> the current position of the encoder</p>
<hr />
<h2 id="grovepiflowenablepin-2-period-2000"><code>grovepi.flowEnable(pin = 2, period = 2000)</code><a class="headerlink" href="#grovepiflowenablepin-2-period-2000" title="Permanent link">&para;</a></h2>
<p>Enables the <a href="https://www.seeedstudio.com/M11%2A1.25-Water-Flow-Sensor-p-1345.html">Grove Water Flow Sensor</a>.</p>
<p>This function literally counts the number of rising pulses in the given time period. Because of that, calling this is the same as calling <code>set_pin_interrupt(pin, ftype=COUNT_CHANGES, interrupt_mode=RISING, period=period)</code> for <em>pin</em>.</p>
<p>If the pin already has an associated interrupt event, calling this method will overwrite the setting with the new change for the given pin.</p>
<p><em>This function will be removed from future versions and it's only kept for making the API backwards-compatible.</em></p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> the pin (D2-D8) to which the dust sensor is assigned to</li>
<li><code>period {Integer}</code> refresh time frame for the dust sensor. Maximum value for this parameter is <em>65535</em> ms.</li>
</ul>
<p><strong>Returns</strong>: None</p>
<hr />
<h2 id="grovepiflowdisablepin-2"><code>grovepi.flowDisable(pin = 2)</code><a class="headerlink" href="#grovepiflowdisablepin-2" title="Permanent link">&para;</a></h2>
<p>Disables the <a href="https://www.seeedstudio.com/M11%2A1.25-Water-Flow-Sensor-p-1345.html">Grove Water Flow Sensor</a>.</p>
<p>Necessary if you want to set output values to this pin with <a href="../gpio/#grovepidigitalwritepin-value">grovepi.digitalWrite</a> function. It's the same as calling <a href="#grovepiunset_pin_interruptpin">unset_pin_interrupt</a> function.</p>
<p><em>This function will be removed from future versions and it's only kept for making the API backwards-compatible.</em></p>
<p><strong>Parameters</strong>: </p>
<ul>
<li><code>pin {Integer}</code> the pin (D2-D8) to which the flow sensor is connected to</li>
</ul>
<p><strong>Returns</strong>: None</p>
<hr />
<h2 id="grovepiflowreadpin-2"><code>grovepi.flowRead(pin = 2)</code><a class="headerlink" href="#grovepiflowreadpin-2" title="Permanent link">&para;</a></h2>
<p>Enables the <a href="https://www.seeedstudio.com/M11%2A1.25-Water-Flow-Sensor-p-1345.html">Grove Water Flow Sensor</a>.</p>
<p>This function counts the number of rising pulses in the time period set with <a href="#grovepiflowenablepin-2-period-2000">grovepi.flowEnable</a>.</p>
<p>It's the same as calling <a href="#grovepiread_interrupt_statepin">grovepi.read_interrupt_state</a> for the given pin.</p>
<p><strong>Parameters</strong>:</p>
<ul>
<li><code>pin {Integer}</code> the pin (D2-D8) to which the flow sensor is connected to</li>
</ul>
<p><strong>Returns</strong>: <code>{Integer}</code> number of rising pulses that occurred within the given time frame</p>
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module.exports=require("./lunr.ja");

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FROM python:alpine3.7
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WORKDIR /docs
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<h1 id="development-notes">Development Notes<a class="headerlink" href="#development-notes" title="Permanent link">&para;</a></h1>
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<h1>Firmware Stuff</h1>
<h2 id="flashing-the-firmware">Flashing the Firmware<a class="headerlink" href="#flashing-the-firmware" title="Permanent link">&para;</a></h2>
<p>To flash the firmware, you must first have the GrovePi library/repository installed so for this you must follow the <a href="../quickstart/#how-to-install">Getting Started guide</a>.</p>
<p>Once the library is installed on the Raspberry Pi, run the following commands to have the firmware flashed onto the GrovePi:</p>
<div class="codehilite"><pre><span></span><span class="nb">cd</span> ~/Dexter/GrovePi/Firmware
bash firmware_update.sh
</pre></div>
<p>This updates you to the latest version of the firmware which is the <code>1.4.0</code>.</p>
<hr />
<p><strong>NOTE TO OTHER LIBRARIES</strong></p>
<p>Because the <code>1.3.0</code> firmware was recently released, lots of other libraries written in other languages other than Python are yet to be updated, so
they need to run on an older version of the firmware, specifically the <code>1.2.7</code>.</p>
<p>The <code>1.2.7</code> version can be found in <code>~/Dexter/GrovePi/Firmware/Archive</code> as <code>grove_pi_v1_2_7.cpp.hex</code>. If you need to run on this older version, follow these steps to burn the firmware:</p>
<div class="codehilite"><pre><span></span>mv ~/Dexter/GrovePi/Firmware/grove_pi_firmware.hex ~/Dexter/GrovePi/Firmware/grove_pi_v1_3_0.hex.bak
cp ~/Dexter/GrovePi/Firmware/Archive/grove_pi_v1_2_7.cpp.hex ~/Dexter/GrovePi/Firmware/grove_pi_firmware.hex
bash firmware_update.sh
</pre></div>
<hr />
<h2 id="running-tests">Running Tests<a class="headerlink" href="#running-tests" title="Permanent link">&para;</a></h2>
<p>To run the entire suite of tests for the GrovePi follow these bash instructions:</p>
<div class="codehilite"><pre><span></span><span class="nb">cd</span> ~/Dexter/GrovePi/Troubleshooting
sudo bash all_tests.sh
</pre></div>
<p>At the end of this process you'll get a <code>log.txt</code> file on your Desktop at <code>~/Desktop/log.txt</code>.</p>
<p>Also, to see with which version of the firmware the library installed on the Raspberry Pi works with you can go to <code>~/Dexter/GrovePi</code> directory and run:</p>
<div class="codehilite"><pre><span></span>python grovepi.py
</pre></div>
<p>This should output a version number (of the GrovePi's firmware). Older versions of the firmware (&lt;=<code>v1.2.7</code>) won't get displayed when calling <code>python grovepi.py</code>.</p>
<div class="codehilite"><pre><span></span>pi@raspberrypi:~ $ python grovepi.py
library supports this fw versions: <span class="m">1</span>.4.0
</pre></div>
<p>To see which is the version of the current firmware loaded on the GrovePi you can either run the above test (<code>... all_test.sh</code>) from the <code>Troubleshooting/</code> directory or you can run these commands:</p>
<div class="codehilite"><pre><span></span><span class="kn">import</span> <span class="nn">grovepi</span>
<span class="k">print</span><span class="p">(</span><span class="n">grovepi</span><span class="o">.</span><span class="n">version</span><span class="p">())</span>
</pre></div>
<p>There are also cases when the GrovePi doesn't respond to requests. In this situation, you would normally see an exception appearing in Python. More often than not, these can be the source of problems:</p>
<ul>
<li>A non-present firmware on the GrovePi.</li>
<li>A mismatch of versions between the firmware and the library on the Raspberry Pi.</li>
</ul>
<p>In both of these situations, re-flashing the firmware is all it's needed.</p>
<h2 id="building-the-firmware">Building the Firmware<a class="headerlink" href="#building-the-firmware" title="Permanent link">&para;</a></h2>
<p>There may be cases where additional modification to the firmware is required to accommodate someone's particular requirements. In this case,
building the firmware and then uploading it is crucial. During our production, we use <a href="https://platformio.org/">PlatformIO</a> along with <a href="https://atom.io/">Atom IDE</a>.</p>
<p>Once you get them both installed on your machine, open Atom IDE and add as a project the <code>/Firmware/Source/grovepi</code> directory. The added directory will have the following structure:</p>
<ul>
<li><code>lib/</code></li>
<li><code>src/</code></li>
<li><code>.gitignore</code></li>
<li><code>.travis.yml</code></li>
<li><code>extra_script.py</code></li>
<li><code>platformio.ini</code></li>
</ul>
<p>Next, click on the build button or use <strong>ALT-CTRL-B</strong> key combination to build the firmware with PlatformIO. Once that it's done, head over to <code>/Firmware/Source/grovepi/.pioenvs/grovepi</code> directory and notice the <code>firmware.hex</code>. That's the firmware that was just built. You can then burn that to your GrovePi.</p>
<h2 id="resetting-the-grovepi">Resetting the GrovePi<a class="headerlink" href="#resetting-the-grovepi" title="Permanent link">&para;</a></h2>
<p>To reset the GrovePi from your Raspberry Pi, run the following command provided you have installed the GrovePi library on your image:</p>
<div class="codehilite"><pre><span></span>avrdude -c gpio -p m328p
</pre></div>
<!-- ## Enabling Software I2C
The GrovePi and the Raspberry Pi communicate over an I2C connection, but the problem with the Raspberry Pi's HW implementation has to do with the clock stretching mechanism. This mechanism is badly implemented and can lead to corrupted transfers with the GrovePi.
More details on this issue can be found on these tickets: [raspberrypi/linux/issues/254](https://github.com/raspberrypi/linux/issues/254) and [dexterind/grovepi/issues/411](https://github.com/DexterInd/GrovePi/issues/411).
In order to avoid having problems caused by the clock-stretching mechanism, you can use our bit-bang implementation of the I2C that uses the [RPi.GPIO](https://pypi.org/project/RPi.GPIO/) library. In order to have this alternative software I2C used instead, install the [DI-Sensors library](http://di-sensors.readthedocs.io/en/master/quickstart.html#how-to-install-the-di-sensors).
To check which I2C you're using, you can import the `grovepi` module and then check the value of `grovepi.whichI2C` attribute. If it's set to `"periphery"` then it means the HW I2C is used and otherwise if it's set to `"software"` then it's using the DI-Sensors' one which is bit-banged. -->
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<h1>Hardware Ports</h1>
<p><img alt="GrovePi+ Ports" src="../img/rpi_hw.jpg" /></p>
<h2 id="port-layout">Port Layout<a class="headerlink" href="#port-layout" title="Permanent link">&para;</a></h2>
<p>The GrovePi+ has multiple types of ports:</p>
<ol>
<li>
<p><em>Analog</em> ports - <strong>A0</strong>, <strong>A1</strong>, <strong>A2</strong> - with these ports you can read the voltage output of sensors. In this diagram, these ports are coloured in blue.
When using the ports with our API, only use integers to designate the port of your choice such as <code>0</code>, <code>1</code> or <code>2</code>.</p>
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<li>
<p><em>Digital</em> ports - <strong>D2</strong>, <strong>D3</strong>, <strong>D4</strong>, <strong>D5</strong>, <strong>D6</strong>, <strong>D7</strong> ,<strong>D8</strong> - with these ports you can read and write digital values of 1 or 0. In the above
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</li>
<li>
<p><em>PWM</em> port - <strong>3</strong>, <strong>5</strong>, <strong>6</strong>, <strong>9</strong> - with these ports you can set a specific voltage output between 0V and 5V by using the concept of duty cycle / PWN / PPM.</p>
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<p><em>I2C</em> ports - which are coloured in yellow and have the SDA &amp; SCL acronyms written. The master of this connection is the Raspberry Pi.</p>
</li>
<li>
<p><em>Serial</em> ports - which are found in the bottom-left corner of the above diagram. <em>SERIAL</em> port is the GrovePi's port whereas <em>RPISER</em> is a bypass to the Raspberry Pi's port,
which has a level converter implemented to accept 5V signals.</p>
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<h2 id="numbering-system">Numbering System<a class="headerlink" href="#numbering-system" title="Permanent link">&para;</a></h2>
<p>Most of the sensors/actuators that we support have the signal line on the outwards of the grove port. For instance,
the <a href="https://www.seeedstudio.com/Grove-Red-LED-p-1142.html">Grove LED</a> has the signal line on the edge of the grove port which corresponds to port number 4 on port name <em>D4</em>,
so for us this was the reason why the port names we have given actually depend on where the signal lines mostly reside.</p>
<p>Looking at a typical grove cable that comes with any GrovePi kit, the signal line is generally the yellow wire and the white
wire is left unused. As you might have guessed, the yellow wire is the outermost wire of the grove cable.</p>
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<h1 id="grovepi-documentation">GrovePi Documentation<a class="headerlink" href="#grovepi-documentation" title="Permanent link">&para;</a></h1>
<p><img alt="DexterIndustries Logo" src="img/biglogo.jpg" /></p>
<p>The <a href="https://www.dexterindustries.com/grovepi/">GrovePi</a> is a <a href="https://www.dexterindustries.com">Dexter Industries</a> open-source platform for connecting Grove Sensors to the Raspberry Pi. With it you can
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<h1>Getting Started</h1>
<h2 id="stacking-it">Stacking It<a class="headerlink" href="#stacking-it" title="Permanent link">&para;</a></h2>
<p>To get the GrovePi up and running we first need to attach the GrovePi to the RaspberryPi. It's
a very simple process where it only needs to be stacked on top the GrovePi just like with any other hat.</p>
<p>Before powering the Pi up, you need to make sure there's no foam sticked to the headers as that
can trigger the Raspberry Pi to reboot. That's because the foam is electrically conductive and it
basically shorts the pins.</p>
<p>In the end the GrovePi will sit on the Raspberry Pi like in the following photo.</p>
<p><img alt="Stacked GrovePi" src="../img/stackedgrovepi.jpg" /></p>
<h2 id="how-to-install">How to Install<a class="headerlink" href="#how-to-install" title="Permanent link">&para;</a></h2>
<p>When it comes to installation there are 2 ways to do it:</p>
<ol>
<li>By using our pre-made image called <a href="https://sourceforge.net/projects/dexterindustriesraspbianflavor/">Raspbian For Robots</a>.</li>
<li>By using a fresh Raspbian image and running our install command.</li>
</ol>
<h4 id="for-raspbian-for-robots-image">For Raspbian For Robots Image<a class="headerlink" href="#for-raspbian-for-robots-image" title="Permanent link">&para;</a></h4>
<p>The benefit of using our image is that you don't have to worry about installing the GrovePi - because it's already on it.
Still after a while you will be required to run updates via the console or via our GUI app in order to get the latest.</p>
<h4 id="for-manual-installation">For Manual Installation<a class="headerlink" href="#for-manual-installation" title="Permanent link">&para;</a></h4>
<p>On the other hand, when using a fresh Raspbian image the initial installation takes some time, but subsequent updates take
way less. The disadvantage with method is that you don't get the other robots installed too, so if you don't want to use
other robots from our family then this method is the preferred one.</p>
<p>To install the GrovePi on a fresh image of Raspbian, run the following command:</p>
<div class="codehilite"><pre><span></span>curl -kL dexterindustries.com/update_grovepi <span class="p">|</span> bash
</pre></div>
<h4 id="how-to-update-to-a-newer-version">How to Update to a Newer Version<a class="headerlink" href="#how-to-update-to-a-newer-version" title="Permanent link">&para;</a></h4>
<p>Regardless of how you got the GrovePi installed (manually or by getting the Raspbian For Robots image), there's only one way to update
to the latest version:</p>
<div class="codehilite"><pre><span></span>curl -kL dexterindustries.com/update_grovepi <span class="p">|</span> bash
</pre></div>
<p>As you can see it's basically the same command used for installing the library on a fresh Raspbian image.</p>
<h2 id="where-is-it-installed">Where Is It Installed<a class="headerlink" href="#where-is-it-installed" title="Permanent link">&para;</a></h2>
<p>Upon installing the GrovePi or getting our flavored image the GrovePi library can be found in <code>/home/pi/Dexter/GrovePi</code> directory.</p>
<p>The <code>/home/pi/Dexter/GrovePi</code> is a mirrored version of <a href="https://github.com/DexterInd/GrovePi/tree/master">our GitHub repository</a> of the master branch.</p>
<h2 id="what-i2c-bus-to-use">What I2C Bus to Use<a class="headerlink" href="#what-i2c-bus-to-use" title="Permanent link">&para;</a></h2>
<p>By default, the GrovePi library is set to use the <code>RPI_1SW</code> bus, which is a software implementation of the I2C specifically built to circumvent
the issues with the hardware I2C of the Raspberry Pi. It's very fast and it doesn't use much CPU time at all. We recommend using this bus, thus,
when importing the <code>grovepi</code> module, you don't have to do anything.</p>
<p>There's also the <code>RPI_1</code>, the classic HW I2C of the Raspberry Pi, which is buggy and unreliable. We don't see any reason in using this one in any scenario. Period.</p>
<p>In order to change the bus, presumably to <code>RPI_1</code> bus, call <code>grovepi.set_bus("RPI_1")</code> or <code>grovepi.set_bus("RPI_1SW")</code> in case you've changed the default one.</p>
<h2 id="scratch-support">Scratch Support<a class="headerlink" href="#scratch-support" title="Permanent link">&para;</a></h2>
<p>Scratch support comes by default with our flavored image, Raspbian For Robots, but if you find yourself to be using the classic Raspbian then
you also need to run the following command after you have installed the GrovePi:</p>
<div class="codehilite"><pre><span></span>sudo bash /home/pi/Dexter/GrovePi/Script/install_scratch.sh
</pre></div>
<h2 id="community-support">Community Support<a class="headerlink" href="#community-support" title="Permanent link">&para;</a></h2>
<p>To find out more on the GrovePi you can visit our forum and check for threads with the <a href="https://forum.dexterindustries.com/tags/grovepi">grovepi tag</a>
or by going to the <a href="https://forum.dexterindustries.com/c/grovepi">GrovePi category</a>.</p>
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<h1 id="release-notes-for-the-firmware">Release Notes For the Firmware<a class="headerlink" href="#release-notes-for-the-firmware" title="Permanent link">&para;</a></h1>
<h2 id="maintenance-team">Maintenance Team<a class="headerlink" href="#maintenance-team" title="Permanent link">&para;</a></h2>
<p>The current and past members of the GrovePi team in alphabetical order are:</p>
<ul>
<li><a href="https://github.com/CleoQc">@CleoQc</a></li>
<li><a href="https://github.com/johnisanerd">@johnisanerd</a></li>
<li><a href="https://github.com/karan259">@karan259</a></li>
<li><a href="https://github.com/RobertLucian">@RobertLucian</a></li>
</ul>
<p>Also, we have a couple of notable contributors to the GrovePi but for other libraries:</p>
<ul>
<li><a href="https://github.com/marcellobarile">@marcellobarile</a> for the NodeJS library</li>
<li><a href="https://github.com/mcauser">@mcauser</a> for adding different new functionalities/bug fixes/examples to our current library</li>
<li><a href="https://github.com/lanselambor">@lanselambor</a></li>
<li><a href="https://github.com/nikkoura">@nikkoura</a></li>
<li><a href="https://github.com/lucavallin">@lucavallin</a> for coming with fixes to the Go library</li>
<li><a href="https://github.com/rpedersen">@rpedersen</a> for C# stuff</li>
<li><a href="https://github.com/k33g">@k33g</a> for Java library</li>
</ul>
<h2 id="version-140-27-april-2019">Version 1.4.0 - 27 April 2019<a class="headerlink" href="#version-140-27-april-2019" title="Permanent link">&para;</a></h2>
<ul>
<li>Add support for setting up interrupt events on each digital port of the GrovePi, thus breaking the limit of just two available hardware interrupts <a href="https://github.com/DexterInd/GrovePi/pull/446">#446</a></li>
<li>Enable the Grove Dust Sensor, the Grove Encoder and the Grove Flow Meter to work on any digital port of the GrovePi and support 7 or 3 or respectively 7 devices at the same time <a href="https://github.com/DexterInd/GrovePi/pull/446">#446</a></li>
</ul>
<h2 id="version-130-1-aug-2018"><a href="https://github.com/DexterInd/GrovePi/projects/2">Version 1.3.0</a> - 1 Aug 2018<a class="headerlink" href="#version-130-1-aug-2018" title="Permanent link">&para;</a></h2>
<ul>
<li>
<p>Fixed synchronization bugs which led to very small IO rates</p>
<ul>
<li>Also caused values to overlap on other ports <a href="https://github.com/DexterInd/GrovePi/issues/412">#412</a></li>
<li>Caused I2C errors when functions were called with no delay between them <a href="https://github.com/DexterInd/GrovePi/issues/409">#409</a></li>
</ul>
</li>
<li>
<p>Small refactorization of the code to something slightly better</p>
</li>
<li>Fixed the dust sensor <a href="https://github.com/DexterInd/GrovePi/issues/408">#408</a></li>
<li>Mitigated abnormality caused by the Raspberry Pi not supporting clock stretching on the I2C <a href="https://github.com/DexterInd/GrovePi/issues/411">#411</a></li>
<li>Debugged and sped up the rate of acquisition of the DHT sensor <a href="https://github.com/DexterInd/GrovePi/issues/418">#418</a></li>
<li>Add IR receiver functionality for any remote control and fix inherent issues with the library <a href="https://github.com/DexterInd/GrovePi/issues/416">#416</a></li>
<li>Add option to set the flow meter and the dust sensor on different ports other than D2 <a href="https://github.com/DexterInd/GrovePi/issues/421">#421</a></li>
</ul>
<h2 id="version-127-20-dec-2016">Version 1.2.7 - 20 Dec 2016<a class="headerlink" href="#version-127-20-dec-2016" title="Permanent link">&para;</a></h2>
<ul>
<li>Faster IO</li>
<li>Less IO Errors</li>
<li>RTC and MMA7xxx accelerometer code removed from the firmware</li>
</ul>
<h2 id="version-122-22-jan-2015">Version 1.2.2 - 22 Jan 2015<a class="headerlink" href="#version-122-22-jan-2015" title="Permanent link">&para;</a></h2>
<ul>
<li>Grove Chainable RGB LED added</li>
<li>Ability to persist a RGB color in memory for later use</li>
</ul>
<h2 id="version-121-30-dec-2014">Version 1.2.1 - 30 Dec 2014<a class="headerlink" href="#version-121-30-dec-2014" title="Permanent link">&para;</a></h2>
<ul>
<li>Grove 4 Digit Display added</li>
</ul>
<h2 id="version-120-29-dec-2014">Version 1.2.0 - 29 Dec 2014<a class="headerlink" href="#version-120-29-dec-2014" title="Permanent link">&para;</a></h2>
<ul>
<li>Grove LED Bar added</li>
<li>Firmware version made available</li>
</ul>
<h2 id="version-11-13-feb-2014">Version 1.1 - 13 Feb 2014<a class="headerlink" href="#version-11-13-feb-2014" title="Permanent link">&para;</a></h2>
<ul>
<li>DHT, ultrasonic, RTC code added</li>
<li>Support for multiple modules for same type added (Not tested)</li>
<li>Protocol made more robust</li>
</ul>
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<h1 id="supported-modules">Supported Modules<a class="headerlink" href="#supported-modules" title="Permanent link">&para;</a></h1>
<p>A <a href="https://www.dexterindustries.com/grovepi/">grid list of supported modules</a> (sensors and actuators) can be seen on our page somewhere in the middle of it - you need to scroll down quite a lot.
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<h1 id="di-sensors">DI-Sensors<a class="headerlink" href="#di-sensors" title="Permanent link">&para;</a></h1>
<p>The GrovePi can also be used along with our <a href="https://github.com/DexterInd/DI_Sensors/">DI-Sensors</a> that require an I2C interface. The GrovePi has 3 I2C ports which can be used for interfacing with these sensors. More can be found in the <a href="http://di-sensors.readthedocs.io">DI-Sensors Documentation</a>.</p>
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