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<h1>Hardware Ports</h1>
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<p><img alt="GrovePi+ Ports" src="../img/rpi_hw.jpg" /></p>
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<h2 id="port-layout">Port Layout<a class="headerlink" href="#port-layout" title="Permanent link">¶</a></h2>
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<p>The GrovePi+ has multiple types of ports:</p>
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<ol>
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<li>
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<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.
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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>
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<li>
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<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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diagram, these ports are coloured in orange. When using the ports with our API, only use integers to designate the port of your choice such as <code>2</code>, <code>3</code> ... <code>8</code>.</p>
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</li>
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<li>
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<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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</li>
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<li>
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<p><em>I2C</em> ports - which are coloured in yellow and have the SDA & SCL acronyms written. The master of this connection is the Raspberry Pi.</p>
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</li>
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<li>
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<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,
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which has a level converter implemented to accept 5V signals.</p>
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</ol>
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<h2 id="numbering-system">Numbering System<a class="headerlink" href="#numbering-system" title="Permanent link">¶</a></h2>
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<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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