Virtual pin to control momentary latch relay

Need Help With My Project
6

I believe the correct way of doing this would be…

#define outputPin 1
#define inputPin V1

No delays, garsh darnit or we kick your donkey :stuck_out_tongue_winking_eye: outta here (but we keep the Porch :house:).

Actually very short delays CAN be used, as long as they are not cumulative or large enough in of themselves to cause a heartbeat timeout (generally even 1-2 seconds can start causing potential issues)… @Jamin’s solution, while so condensed into uber coder shorthand as to be indistinguishable from magic :stuck_out_tongue_winking_eye: … would have better suited your needs, and allowed for a non-blocking relay latch ranging well into multiples of minutes/hours if needed.

Goober level coder translation follows :wink:

BLYNK_WRITE(inputPin) {
  if (param.asInt()) { // act only on the HIGH and not the LOW of the momentary
    digitalWrite(outputPin, !digitalRead(outputPin));  // invert pin state just once
    tripWire.setTimeout(1000L, [](){
      digitalWrite(outputPin, !digitalRead(outputPin));  // then invert it back after 1000ms
    });
  }
}

That == this…

#define outputPin 1
#define inputPin V1

BLYNK_WRITE(inputPin) {
  if (param.asInt() == 1) { // Run only when ON/HIGH state of button
    digitalWrite(outputPin, HIGH); // activate relay
    tripWire.setTimeout(1000L, DeactivateRelay);  // In 1 second, run the deactivate function call
  }
}

void DeactivateRelay() {
  digitalWrite(outputPin, LOW); // Deactivate relay
}

And, yes, I know it is pronounced Porsche… silly little cars… Lamborghini all the way!