
Many people like this board. A nice bonus was the onboard 40-pin connector for compatibility with other RPi projects. Unfortunately, the onboard ADC is hardwired to GPIOs 16, 20, and 21, and its power and chip select pins are also hardwired. This means it conflicts with PCM/I2S operation (which uses 18-21 GPIOs) on a standard (RPi) 40-pin header. This makes my RPi 3 B+ and RPi Zero W project incompatible with this board.

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