I am new to arduino and I am trying to make a cumulative countdown timer using my Arduino Uno to shut off a relay when the timer is up. I am able to get the relay working using the blinking LED code found online.
I want to use a push button so that every time it is pushed it will add 5sec to the countdown timer.
Like I said I am new to this but I have a little understating. Any help or insight would be a great help.