28 lines
1.9 KiB
Markdown
28 lines
1.9 KiB
Markdown
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## Port Layout
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The GrovePi+ has multiple types of ports:
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1. _Analog_ ports - **A0**, **A1**, **A2** - 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 `0`, `1` or `2`.
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2. _Digital_ ports - **D2**, **D3**, **D4**, **D5**, **D6**, **D7** ,**D8** - 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 `2`, `3` ... `8`.
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3. _PWM_ port - **3**, **5**, **6**, **9** - with these ports you can set a specific voltage output between 0V and 5V by using the concept of duty cycle / PWN / PPM.
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4. _I2C_ ports - which are coloured in yellow and have the SDA & SCL acronyms written. The master of this connection is the Raspberry Pi.
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5. _Serial_ ports - which are found in the bottom-left corner of the above diagram. _SERIAL_ port is the GrovePi's port whereas _RPISER_ is a bypass to the Raspberry Pi's port,
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which has a level converter implemented to accept 5V signals.
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## Numbering System
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Most of the sensors/actuators that we support have the signal line on the outwards of the grove port. For instance,
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the [Grove LED](https://www.seeedstudio.com/Grove-Red-LED-p-1142.html) has the signal line on the edge of the grove port which corresponds to port number 4 on port name _D4_,
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so for us this was the reason why the port names we have given actually depend on where the signal lines mostly reside.
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Looking at a typical grove cable that comes with any GrovePi kit, the signal line is generally the yellow wire and the white
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wire is left unused. As you might have guessed, the yellow wire is the outermost wire of the grove cable.
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