Simply check if 'seconds' is 60 or whatever, if it is, then execute your code. 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 30 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 and I specialise in the field of Mental Health for a number of years. 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. Create your timers with optional alarms and start/pause/stop them simultaneously or sequentially. Message from the Creator of Tick Tock Countdown TimerI am Tom C. 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: You choose how many hours, minutes or seconds the timer should last. Set the hour, minute, and second for the online countdown timer, and start. Set a countdown timer for 1 minute and 50 seconds and well alert you when it expires. ![]() Use this timer to easily time 57 Minutes. ![]() First of all, PLEASE read the How To Use This Forum thread before you post. It is a free and easy-to-use countdown timer. Talking Clock Our Talking Clock is great for keeping track of the time Video Timers A Clock or Countdown with a video background.
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