I have an audio amplifier board that I would like to mute and unmute by software. The board has two pins layed out to connect a button, which basically seems to just pull that specific pin to GND.
I tried to connect a Seeduino Xiao (pin 3, others also tested) and just do these lines to pull it to ground.
pinMode(3, OUTPUT); digitalWrite(3, LOW);
Strangely the amp just ignores this. If I connect the wire to the Xiaos GND pin the amp is muted...
What am I missing here? Hope someone can guide me in the right direction. Thank you!
Unforunately I could not find any datasheet for that amplifier module: ANGEEK TPA3118 PBTL 1x60W Mono Digital Audio Verstärker Board Amp Power Module für Arduino
Have a good day everybody,
// edit: just measured the board. Found a 1.1k pull up to VCC (in my case 12V) on the mute line.