In this section, we will use the Particle Photon to send a notification using IFTTT. When the motion sensor detects something, it will send a notification. First, we will have the following diagram for this project:

The Particle.publish() event will later act as an IFTTT trigger.

The code for the motion sensor is as follows:

#define PIR_PIN D0 // Replace D0 with the pin you used 
#define MIN_TIME_BETWEEN_TRIGGERS 2000 // Time (in milliseconds) of no motion before a new trigger can occur 
void setup() { 
   pinMode(PIR_PIN, INPUT); 
} 
void loop() { 
   // PIR_PIN goes HIGH when motion is detected, stays HIGH for a few seconds 
   if (digitalRead(PIR_PIN)) { 
       Particle.publish("motion-detected"); 
       
       // store current time in variable 
       unsigned long motionTime = millis(); 
       
       // wait until no motion has been detected for MIN_TIME_BETWEEN_TRIGGERS milliseconds before a new trigger can occur 
       while(millis() - motionTime < MIN_TIME_BETWEEN_TRIGGERS) { 
           if (digitalRead(PIR_PIN)) motionTime = millis(); 
       } 
   } 
}