The code I copied is from this page: Low-Power Arduino Using the Watchdog Timer. Sleep_count ++ // keep track of how many sleep cycles have been completed. which will yeild a time-out interval of about 8.0 s. Set the watchdog timeout prescaler value to 1024 K Set the WDCE bit (bit 4) and the WDE bit (bit 3) of WDTCSR.
Clear the reset flag, the WDRF bit (bit 3) of MCUSR. Sleep_disable() // Disable sleep mode after waking. After waking from watchdog interrupt the code continues Set_sleep_mode(SLEEP_MODE_PWR_DOWN) // Set sleep mode. and continues to execute code when it wakes up GoToSleep() // ATmega328 goes to sleep for about 8 seconds Disable digital input buffers on all analog input pins by setting bits 0-5 to one. Disable the analog comparator by setting the ACD bit (bit 7) to one. I could use delay function, but i want to use millis function, because i dont want to block the code using delay in loop.
#Arduino millis catch overflow serial
ARDUINO Get access to all the training courses and exclusive community. Im trying to print in Serial screen the number 1 - 6, ONE number every 5 seconds (Im trying only with number 1 and number 2 for smaller and easier to undestand and modify code). Disable the ADC by setting the ADEN bit (bit 7) to zero. So how do we access this information Enter the millis. WatchdogOn() // Turn on the watch dog timer. needed before the interval defined above elapses. I didn't specifically understand what is meant by 'since. This number will overflow (go back to zero), after approximately 50 days. Volatile int sleep_count = 0 // Keep track of how many sleep cycles have been completed.Ĭonst int interval = 720 // Interval in minutes between waking and doing tasks.Ĭonst int sleep_total = (interval*60)/8 // Approximate number of sleep cycles In the explanation of millis () function it says Returns the number of milliseconds since the Arduino board began running the current program. This variable is made volatile because it is changed inside an interrupt function For that variable, temporarily, time froze :) In loop (), if you continuously call millis () you'll get an increasing value. You could use an extra variable to build a make-shift stopwatch like mechanism: In setup () would store the current millis () in a variable. When the timer overflow interrupt enable. Otherwise, it doesn't matter whether your MCU saves energy if your board doesn't. millis () returns the number of milliseconds since the arduino code started running. When a timer overflow interrupt occurs, the timer overflow bit TOVx will be set in the interrupt flag register TIFRx. That means you have to have a low quiescent voltage regulator instead of the usual regulators that equip the most common Arduino boards, such as the Uno. The overflow interrupt is already being used by the timing functions millis. You could use the watchdog interrupt and have your MCU sleep while waiting and save power.īut notice that you'll only save power if your board also saves it. get anything close to the millis() function from Arduino.
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