Hi folks, for a uni project I’m creating a synth using an Arduino. I want to have at a minimum 8 buttons for an input but I’m restricted to using only 1 or 2 input pins. Therefore I wanted to use an ADC to convert the input to binary values.
I wanted to use no IC’s if possible so tried using an R2R DAC in reverse as an ADC but the issue I had was the buttons were floating and not grounded when open. I’ve tried using 10ohm resisters on each button which works but increases the load. However using too high resister values ruins the structure of the R2R
If anyone could help me with a schematic/solution it would be much appreciated.
I wanted to use no IC’s if possible so tried using an R2R DAC in reverse as an ADC but the issue I had was the buttons were floating and not grounded when open. I’ve tried using 10ohm resisters on each button which works but increases the load. However using too high resister values ruins the structure of the R2R
If anyone could help me with a schematic/solution it would be much appreciated.