12/30/2023 0 Comments 8 seconds 8 minute timer![]() ![]() I understand blogoo (OP) wanted to take his code and make it sleep for longer than the 8 second limit. How can you do that at the end of sleep time to reboot the controller? In your code: // Example of sleeping and saving power * Mode 0 - Do nothing - normal 16Mhz clock For delay(1000) with Mode 4, delay would be 16x longer. Here's what I'm using so far: // Example of sleeping and saving power Shouldn't I have my measurements taken during the awake phase (ie before the sleep phase starts)? Is that not between the digitalWrite HIGH and LOW in the code you gave (where it says "do stuff here")? Should those measurements be somewhere else in the code? If that's where you want to sleep, I suppose so. Sleep_mode() // now goes to Sleep and waits for the interrupt WDTCSR = 0b01000000 | interval // set WDIE, and appropriate delay WDTCSR |= 0b00011000 // see docs, set WDCE, WDE ![]() Void myWatchdogEnable(const byte interval) Yes, you have to do it multiple times to get more than 8 seconds, but it isn't that bad: // Example of sleeping and saving power Wdt_reset() // give me another second to do stuff (pat the dog)Īnd here is an example of using a watchdog to wake after sleep. Wdt_enable(WDTO_1S) // reset after one second, if no "pat the dog" received Here is an example of using a watchdog to reset you: #include * Enable the WD interrupt (note no reset). * set new watchdog timeout prescaler value */ * set WDCE (This will allow updates for 4 clock cycles). * In order to change WDE or the prescaler, we need to * Description: Setup for the serial comms and the Sleep_disable() /* First thing to do is disable sleep. * The program will continue from here after the WDT timeout*/ Set_sleep_mode(SLEEP_MODE_PWR_DOWN) /* EDIT: could also use SLEEP_MODE_PWR_DOWN for lowest power consumption. * Description: Enters the Arduino into sleep mode. ![]() * Description: Watchdog Interrupt Service. #define Set_prescaler(x) (CLKPR = (1 << CLKPCE), CLKPR = x) Is there a way to have the timer not wake up the system for 240 seconds (4 minutes) at a time? I've tried WHILE statements but that didn't work (i.e. I understand that the watchdog timer works well to wake up a system. I'm trying to create a system that will be in SLEEP_MODE_PWR_DOWN state for 4 minutes at a time, and then wake up and take measurements. ![]()
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