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ACH Thumbstick Click RPi Demo

Rating:

4

Author: Andrew Hazelden

Last Updated: 2014-08-24

Category: Gaming and Fun

Downloaded: 388 times

Followed by: 2 users

The python based thumbstick.py demo allows you to read a MikroElektronika Thumbstick Click board on a Raspberry PI using the GPIO and SPI inputs via a Pi Click Shield. The Thumbstick Click board uses an SPI based MCP3204 module for reading the joystick axes and the joystick "center click" button is read using the GPIO input 17 on the Raspberry Pi.

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Library Blog

Raspberry Pi and Thumbstick Click Board

Raspberry Pi and Thumbstick Click Board

The Thumbstick Click board is connected to a Raspberry Pi using the MikroE Pi Click Shield. This shield connects to the Raspberry PI GPIO header pins and lets you attach MikroBus format (http://www.mikroe.com/mikrobus/) Click boards.

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Thumbstick Click

Thumbstick Click

The Thumbstick Click board uses an SPI based MCP3204 module for reading the joystick axes. The ADC0 channel is used for the y-axis and the ADC1 channel is used for the x-axis. The board is powered on 3.3 Volts from the GPIO header on the Raspberry PI.

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Thumbstick Click Button

Thumbstick Click Button

The joystick "center click" button is read using the GPIO input 17 on the Raspberry Pi and has an inverted logic state where the button clicked=0, and the button unclicked=1. If you take the rubber joystick cap off the thumbstick you can see

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Thumbstick.py Script

Thumbstick.py Script

Run the thumbstick.py demo script using " sudo python thumbstick.py". If the script runs correctly you will be presented with the following output in the terminal

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Webiopi GPIO Header

Webiopi GPIO Header

You can use the webiopi webGUI to read the current GPIO pin state from a web browser. This is interesting as you can see the input and output mapping and see the binary state of each of the GPIO pins.

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Webiopi Device Monitor

Webiopi Device Monitor

You can also watch the live values on the Thumbstick's 2 ADC channels (Joystick X & Y Axis) using the webiopi "Device Monitor" webpage.

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