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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'.
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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) When the timer is up, it will blink and sound an alarm. You can pause and resume this timer anytime by clicking the Pause or Resume buttons. This online countdown timer will alarm you with sound in 1 minute. So, cycles is NOT less than RESOLUTION - 1, therefore it was more than maximum This page is a 1 minute timer that counts down once you click Start. Then, just select the sound you want the alarm to make in 1. For instance, you could enter the message: wake me up in 1 minutes. You can enter a personal message for the timer alarm if you want to. RESOLUTION is set to 65536 because Timer1 is a 16bit timer.Ĭycles = (16,000,000 / 2,000,000) * 60,000,000 = 480,000,000 Absolutely This page makes it fast and easy to set a 1 minutes timer - for FREE In fact, a 1 minutes timer is already preset on this page.
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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.