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. Attempting to install timers in Seconds for iOS should be done through Safari. 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) You have reached the final lines about this 1 hour 30 minutes alert, and we hope our moving circles have been useful to you in counting the time down to zero. So, cycles is NOT less than RESOLUTION - 1, therefore it was more than maximum RESOLUTION is set to 65536 because Timer1 is a 16bit timer.Ĭycles = (16,000,000 / 2,000,000) * 60,000,000 = 480,000,000 Countdown Timer: It counts down from 1 Minute Timer to zero, allowing you to keep track of the time remaining for a task, break, or activity. Press the Start/Pause button to start/pause the timer count. ![]() 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 Click the hours,minutes and seconds textboxs to set the count time duration. 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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