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Similar to the previous example, this one shows how to use an external analog-to-digital convertor (Microchip MCP3008) to get additional inputs for axes. Check out Adafruit's MCP3008 CircuitPython ...
Example of connecting MCP3008 ADC chip using CircuitPython. The MCP3008 is an 8 channel 10 bit analog to digital converter and useful for Rasp Pi which does not have analog input pins. This circuit ...