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. Great to Relax or Sleep Timer Set a Timer from 1 second to over a year Big screen countdown. Here is a slightly modified program I made to easily set up timed interrupts. Talking Clock Our Talking Clock is great for keeping track of the time Video Timers A Clock or Countdown with a video background. 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) 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 (days) (hours) (minutes) (seconds) START RESET Timer Settings. In 'timer settings' you can change the time for timer. 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. If you want to start again and set timer for 1 minute or set alarm for 1 minute, just press the 'reset' button. 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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