Hi... I have a little trouble, that is: I want to start a countdown (with a push button) and turn on 3 led in 3 different moment. What I have to do for starting the countdown? I have no idea of what kind of code I have to write. :-/

thanks in advance

when the button is pressedis pressed set a variable to the value returned by millis(), then each time through the main loop check if the current value of millis() is still less than the value of the variable + whatever time you want each of the leds on for (3 seperate tests) if it is not less, then turn the relevent led off