Bounce Library, for Easily Reading Pushbuttons or Mechanical Sensors With Contacts That "Bounce"
pins - Multiple buttons on single interrupt, how to debounce? - Arduino Stack Exchange
How do you debounce a button without using delay? i separated my code to functions so i just call them in the loop, majority isnt started yet which one of them is
Arduino - Debounce
Embed With Elliot: Debounce Your Noisy Buttons, Part I | Hackaday
Switch library
Detecting Multiple Button Clicks in an Arduino Sketch