set up to handle interrupt from 1 Hz pinĪttachInterrupt (digitalPinToInterrupt (rtcTimerIntPin), rtc_interrupt, CHANGE) Rtc.writeSqwPinMode (DS3231_SquareWave1Hz) following line sets the RTC to the date & time this sketch was compiled Serial.println("RTC lost power, lets set the time!") While (!Serial) // for Leonardo/Micro/Zero
Arduino timer interrupt setup code#
Next, the 1 Hz output needs a pull-up resistor, so you should add that or make it INPUT_PULLUP like this: pinMode (rtcTimerIntPin, INPUT_PULLUP) Īdapting one of their examples, and putting in your interrupt code (with my modifications), it worked! #include I also made it a CHANGE interrupt so you get both the rising and falling pulse. This is correct: attachInterrupt (digitalPinToInterrupt (rtcTimerIntPin), rtc_interrupt, CHANGE) You need an interrupt number, not a pin number. I happened to have a DS3231 lying around so I made up a test.įirst, this is wrong in your code: attachInterrupt(rtcTimerIntPin, rtc_interrupt, RISING) This answer addresses the original question of why the interrupts didn't work.
Arduino timer interrupt setup serial#
Serial.println("Clock did not lose power") ĪttachInterrupt(rtcTimerIntPin, rtc_interrupt, RISING) ĭigitalWrite(LED_BUILTIN, HIGH) // flash the ledĭigitalClockDisplay() // this just prints time to serial portĭigitalWrite(LED_BUILTIN, LOW) // turn off ledįlag = false // clear the flag until timer sets it again Time_t newTime = cvt_date(_DATE_, _TIME_) Serial.println("Detected clock power loss - resetting RTC date") Serial.println("RTC has set the system time") Serial.println("Unable to sync with the RTC") SetSyncProvider(gRTC.get) // the function to get the time from the RTC Here is some simple code for a sketch that I think should trigger a 1 second interrupt and call my function: #include // I also added a led in the circuit to see if I could figure out something that way, but no dice.
I followed what I thought was the wiring diagram here and I tried to use the square wave to trigger a call back/interrupt, but it's not working for me. Can someone point me to a reference for this? I am able to set up one hz interrupts using millis and other timers, but would like to do it instead using the RTC I have attached ( DS3231)
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