A hardware SPI remake of the bit-banged Adafruit project: Analog Inputs for Raspberry Pi Using the MCP3008. Take a look at the Adafruit project and particularly the datasheet for the MCP3008 - what we’re making is a hardware volume control using a 10K potentiometer. Instead of using the GPIO pins and bit-banging the SPI protocol I’m using the proper SPI pins and the hardware driver.
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