![]() -This is where I expected the arduino to power off. PinMode(interruptPowerPin, INPUT_PULLUP) //Interrupt only works if pin goes LOWĪttachInterrupt(digitalPinToInterrupt(interruptPowerPin), interruptPower, LOW) // This only works for LOW Serial.println("Exiting doingTheThingLoop()") ĪttachInterrupt(digitalPinToInterrupt(interruptBlinkPin), interruptBlink, RISING) While(makeBlinkFlag) //If the makeBlink button has been pressed, do these instructions. If it's not, exit this function to return to loop. While(powerFlag) // If power is on, do next thing. Serial.println("Inside doingTheThingLoop()") Volatile boolean powerFlag = false // false = NO true = YESĭigitalWrite(LED_BUILTIN, HIGH) //Turn on LED_BUILTIN Volatile boolean makeBlinkFlag = false // false = NO true = YES * RGB LED is common cathode, 100ohm resistors connect pins 7-9 to leads. * - push button connects Vcc to pin 2 with 10k resistor to ground * - makes an RGB LED start & stop flashing in sequence. * - makes arduino go into/come out of low power mode #FREE42 FORUM CODE#* Code to make arduino go into and out of low power mode. #FREE42 FORUM SERIAL#This is on Serial Monitor: ⸮⸮iting doingTheThingLoop() I click the power button again to turn it back on. The arduino turns off and I see this on Serial Monitor: Now I click the power button again to turn it off. I can press the Blink button and the blinking starts and stops like it should. Just passed LowPower.powerDown(SLEEP_FOREVER, ADC_OFF, BOD_OFF) The LED_BUILTIN turns on for just a split second. Instead the arduino immediately goes into low power mode and I only see this on Serial Monitor: ⸮ I expect to see "Hello World!" and then "Starting loop()" on the Serial Monitor since the first instruction is in setup, and the second occurs before the LowPower instruction. Here's how it unfolds: I first upload the code. Second of all, after uploading the code the arduino goes to sleep before it finishes executing the setup code, even though the LowPower instruction doesn't appear until inside the loop function! (Is this something the LowPower library makes happen by default?) (More specifically, the code moves into a function and then falls asleep in the middle of printing characters to the Serial Monitor - see below.) After that line, it executes another few lines before falling asleep. #FREE42 FORUM HOW TO#Can anybody tell me what I'm doing wrong or how to improve it?įirst of all, I thought the arduino would sleep when it executes the LowPower.powerDown(SLEEP_FOREVER, ADC_OFF, BOD_OFF) instruction but it doesn't, at least not right away. I've got the code working but it's not behaving the way I expect. Is there an easier way to do this that I'm missing? Thank you! Why attach the interrupt in the loop? Won't that put the arduino back to sleep every time it goes through the loop? I guess I don't understand how this code is supposed to execute. Example: Read sensor, data logging, data transmission. Disable external pin interrupt on wake up pin. LowPower.powerDown(SLEEP_FOREVER, ADC_OFF, BOD_OFF) Enter power down state with ADC and BOD module disabled. Allow wake up pin to trigger interrupt on low. I found a different Low-Power library here but I can't seem to figure out its external interrupt example code - see below. I found this LowPowerExternalWakeup tutorial which sounded like what I wanted but it uses an "ArduinoLowPower.h" library that I can't find. I looked at using the Narcoleptic library but there's a bug report saying it doesn't work on a 3.3V 328 arduino I could use a SPST switch in the power supply, but I'd rather use a single push button to control the power, or at least, to put the arduino to sleep and then wake it back up. I'm making an altitude recorder to go in a model rocket, so I'm trying to reduce weight as much as possible. ![]()
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