OpenSprinkler › Forums › Hardware Questions › Want to add DAC to OSPI. Need access to GPIO pins? › Reply To: Want to add DAC to OSPI. Need access to GPIO pins?
Note that OSPi has a PCF8591 A/D D/A converter on-board, which provides 1 channel of DAC. Would this suffice for your need? I think it’s only 8-bit so I am not sure if the resolution is sufficient. PCF8591 uses I2C.
I am not familiar with I2S — did you mean I2C?