Simply check if 'seconds' is 60 or whatever, if it is, then execute your code. The online countdown timer alarms you with a sound in one minute. 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. 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 You can reset the timer at any time using the 'Reset' button. Use this timer to easily time 32 Minutes. Great to Relax or Sleep Timer Set a Timer from 1 second to over a year Big screen countdown. The timer will alert you when it expires. Talking Clock Our Talking Clock is great for keeping track of the time Video Timers A Clock or Countdown with a video background. You can also pause the timer at any time using the 'Pause' button. Use this timer to easily time 57 Minutes. The timer will alert you when it expires. Press the 'Start' button to start the timer. You can reset the timer at any time using the 'Reset' button. Talking Clock Our Talking Clock is great for keeping track of the time Video Timers A Clock or Countdown with a video background. You choose how many hours, minutes or seconds the timer should last.
Press the 'Start' button to start the timer. A countdown timer for 1 minute and 24 seconds.
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 A countdown timer for 1 hour and 16 minutes. 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. Use this timer to easily time 80 Minutes. 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: Talking Clock Our Talking Clock is great for keeping track of the time Video Timers A Clock or Countdown with a video background. First of all, PLEASE read the How To Use This Forum thread before you post.