I'm trying to figure out a way to controll a DFplayer mini mp3 player with ADkeys.
Because I only have two or three files to play at a fixed volume I find it easier to just use the ADkeys. https://wiki.dfrobot.com/DFPlayer_Mini_SKU_DFR0299#target_4
Lets say I want to use Segment 1 - Segment 3 (MP3 file 1 - MP3 file 3). I would then connect a resistor (or none in Segment 1) in between and to three pins on the Arduino.
But how can I make the pin neutral, so that it does not trigger everything at once?
As far as I can read the pins are grounded in Arduino if not "high".