delay ( )
delay() tells the Arduino to wait for a certain amount of time. While waiting during a delay, Arduino doesn't do anything new. After waiting, it will follow the instruction on the next line of code.
It takes an input, which is an
int tells the Arduino how long to wait for. It's a number of milliseconds. 1000 milliseconds is the same as 1 second. So
delay(1000) will wait for 1 second.
delay() is lets you separate instructions by a certain amount of time. For example, you could turn the LED on, use
delay() to wait for one second, and then turn it off. This is helpful if you want to make the LED blink, or use the buzzer to play a song.