22. Advanced information
The following section is for more advanced users.
GPIO usage / Pin headers)
The IQaudIO range of sound cards for the Raspberry Pi take advantage of a number of Pi signals in
order to operate successfully. Some of these signals are solely for the use of the IQaudIO board and
some can be shared with other peripherals, sensors, etc. The information below covers the general
cases. For more Raspberry Pi GPIO information please see the excellent site: https://pinout.xyz
We expect the following Raspberry Pi GPIO to be used by IQaudIO audio boards
• ALL POWER PINS
• ALL GROUND PINS
• GPIO 2/3 (I2C)
• GPIO 18/19/20/21 (I2S)
If appropriate then the following are also used
• GPIO 22 (DigiAMP+ mute / unmute support)
• GPIO 23/24 for Rotary Encoder (physical volume control) or status LED (Pi-CodecZero)
• GPIO 25 for the IR Sensor.
• GPIO 27 for the Rotary Encoder push switch / Pi-CodeZero switch
Pi-DAC PRO, Pi-DAC+, Pi-DigiAMP+, Pi-DACZero, Pi-Codec+, Pi-CodecZero
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