Need some help with and equasion to count down.

Forum 2005-2010 (read only) Software Syntax & Programs
1

Hey everyone, I need a little help with a timer project. I want to have a screen count down from 14min to 0min and then set off a buzzer. I know how to do that but I don't know how to count down without saying:

lcd.print("14:00");
delay(1000);
lcd.clear();
lcd.print("13:59");

and so on.
How could I have it count down using an equasion to count it down for me and then set off a buzzer?
I'm a little bit of a noobie but you dont have to go easy with me, ask for more detail if needed and thanks in advance!

2 
byte minutes = 14;
byte seconds = 0;

for (int m=minutes; m>=0; m--) {
      for (int s=seconds; s>=0; s--) {
            //print m and s
            delay(1000);
      }      
}

something along the lines of that, (the code is absolutely not tested) :slight_smile:

3

Wait until millis() reaches 1000, 2000 etc. It takes some number of milliseconds to print m and s, which will be implicitly added to the delay.