Things used in this project

Hardware components:
Photon new
Particle Photon
×1
Wemos Relay Shield
×1
Liftmaster Garage Door Button
×1
Reed Switch
×1
micro usb Power Supply
Used an old bluetooth headset charging plug
×1
Software apps and online services:
Particle Build Environment
IFTTT Particle
SmartThings Developer Environment
Hand tools and fabrication machines:
09507 01
Soldering iron (generic)
Wire Strippers / crimpers (generic)
Wires (female to female pin connectors)

Schematics

Wiring diagram
Reed switch and relay connected to the Particle Photon, door button connected to the relay
Fritzing haj1mztp2x

Code

Photon GarageC/C++
Use build.particle.io to upload this to the Particle Photon of your choice (as long as it's the one connected to the garage door opener).
int openGarageDoor(String pin);
int closeGarageDoor(String pin);

int relayPin = D1;
int sensorPin = D4;
String state = "closed";

void setup() {
    // make functions visible to Particle
    Particle.function("openGarage", openGarageDoor);
    Particle.function("closeGarage", closeGarageDoor);
    // set pinModes
    pinMode(relayPin, OUTPUT);
    pinMode(sensorPin, INPUT_PULLUP);

}

void loop() {
  // tell Particle if the door opens
  if (state != "open") {
      if (digitalRead(sensorPin) == HIGH) {
          Particle.publish("Garage_Door_Status", "open");
          state = "open";
      }
  }
  // tell Particle if the door closes
  if (state != "closed") {
      if (digitalRead(sensorPin) == LOW) {
          Particle.publish("Garage_Door_Status", "closed");
          state = "closed";
      }
  }
}

int openGarageDoor(String pin) {
    if(state == "closed"){
        Particle.publish("Garage_Door_Status","opening");
        digitalWrite(relayPin, HIGH);
        delay(1000);
        digitalWrite(relayPin, LOW);
    }
return 0;
}

int closeGarageDoor(String pin) {
    if(state == "open"){
        Particle.publish("Garage_Door_Status","closing");
        digitalWrite(relayPin, HIGH);
        delay(1000);
        digitalWrite(relayPin, LOW);
    }
return 0;
}

Credits

5122f3c8245558d1be6fd4b74625f990
David Smyth

Electrically inclined mechanical engineer. Addicted to projects.

Contact

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