The name Fez was chosen since these boards are small hats but do not implement the required circuitry nor are they mechanically complient with the official Hat specifications from the Raspberry Pi Foundation.
This board adds a PCM5102A audio DAC to your Raspberry Pi of choice. This size fits perfect on an RPi Zero but it will work on full size Raspberry Pi boards as well. Some headers are provided to quickly add some IO and communicate over UART or I²C.
