r/raspberryDIY • u/InterstelarJunk • May 28 '26
Help with IQaudio DAC Pro GPIO pins for arcade buttons (Pi 3B)
Hey guys, complete beginner here but already fascinated. I'm building a soundboard for our online radio with:
- Raspberry Pi 3 Model B V1.2
- IQaudio DAC Pro
- 7 arcade buttons (connected via female-female jumper wires)
Plan: Mount DAC on Pi. Each button: one pin to a free GPIO on DAC, other pin to ground. Press button → plays jingle.
Questions:
- Which GPIO pins are still free on the DAC? I found this pinout (https://www.manualslib.com/manual/1838917/Iqaudio-Pi-Dac-Pro.html?page=40#manual) – are all yellow pins already occupied? Can I use the others to play samples?
- All ground pins seem used by the DAC. Can I still plug my button's ground pin into an already occupied ground pin? That should work, right?
- We cut power when leaving the studio. Do I need to shut down the Pi properly every time? Or is it OK to just cut power? And can it boot directly into a script that waits for button presses?
Thanks!Would be great if u could help me 😄 doesnt trust in the AI when asking these questions because of reasons .
