Start the timer via the quick links or set the timer via the keyboard. Simply check if 'seconds' is 60 or whatever, if it is, then execute your code. minutessecondsStop alarmOnline timerCountdown timer. The interrupt gets called every 1 second and adds 1 to 'seconds'. I tested its accuracy and it works consistently down to the microsecond. Here is a slightly modified program I made to easily set up timed interrupts. Use this timer to easily time 18 Minutes. Great to Relax or Sleep Timer Set a Timer from 1 second to over a year Big screen countdown. This code sets the prescaler to 1024, as slow as you can get.Ī prescaler of 1024 allows for a maximum time of 8388.608mS or ~8.3 seconds clockSelectBits = _BV(CS12) | _BV(CS10) Talking Clock Our Talking Clock is great for keeping track of the time Video Timers A Clock or Countdown with a video background. So, cycles is NOT less than RESOLUTION - 1, therefore it was more than maximum If(cycles < RESOLUTION) clockSelectBits = _BV(CS10) // no prescale, full xtalĮlse cycles = RESOLUTION - 1, clockSelectBits = _BV(CS12) | _BV(CS10) // request was out of bounds, set as maximum long cycles = (F_CPU / 2000000) * microseconds // the counter runs backwards after TOP, interrupt is at BOTTOM so divide microseconds by 2 Your code, which would have showed me the library you were usingĪnyway, here is what I found in the library I ASSUME you are using. I had to do alot of googling, which most people WILL NOT DO, simply because you failed to tell us basic things about your problem, such as: First of all, PLEASE read the How To Use This Forum thread before you post.
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