Andrea S.
Published © CC BY

Burglar at the Door!

Detect when someone is standing or kneeling close to my apartment door for a suspicious time.

BeginnerFull instructions provided6 hours256
Burglar at the Door!

Things used in this project

Hardware components

Proximity Sensor- Pyroelectric Infrared Sensor Module
KEMET Electronics Corporation Proximity Sensor- Pyroelectric Infrared Sensor Module
×1
Photon
Particle Photon
×1
Buzzer
Buzzer
This is optional
×1

Software apps and online services

Particle Build Web IDE
Particle Build Web IDE
Maker service
IFTTT Maker service

Story

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Code

Particle firmware (copy and paste in Particle IDE)

Arduino
You may want to adjust the variables at the beginning of the code to improve detection threshold
// -----------------------
// Burglar_PIR - Andrea S.
// 29/02/2020
// -----------------------

// Hardware
int pirPin = A5;
int blueLed = D7;
int buzzer = A2;                    // optional buzzer alarm
int debounceDelay = 100;            // signal must be high for at least 100 ms
// Motion detection
int countThreshold = 15;            // how many times must the PIR trigger to generate a detection
int decTime = 5000;                 // every 3 seconds the trigger count is decreased
int divider = 2;                    // how fast is the counter decreased after a detection
int motionCount = 0;                // number of triggers
int pirState = 0;
int ledTime = 150;                  // blink duration

// Timer to decrease trigger counts
Timer timerDec(decTime, decMotionCount);

void setup() {
    
    // Set pin modes
    pinMode(pirPin, INPUT);
    pinMode(blueLed, OUTPUT);
    pinMode(buzzer, OUTPUT);

    // Test tone
    tone(buzzer, 1800, 150);
    delay(200);
    tone(buzzer, 2500, 150);
  
    // Declare cloud variables
    Particle.variable("status", motionCount);
    // Start timer
    timerDec.start();
}

void loop() {
    // read the state of the PIR signal into a local variable:
    int reading = digitalRead(pirPin);
    
    // check to see if it is a true new detection:
    if (reading == HIGH) {
        delay(debounceDelay);
        reading = digitalRead(pirPin);
    }
    else {
        // PIR is not triggered
        pirState = LOW;
    }
    
    // trigger detected
    if (reading == HIGH && pirState == LOW) {
        motionCount++;
        pirState = HIGH;
    }

    if (motionCount > countThreshold) {
        // motion detected!
        blinkBlue(2);
        motionDetected();
        motionCount = motionCount / divider;
    }
}

void motionDetected() {
    // publish event
    Particle.publish("burglarPIR_motion", "motionDetected", 60, PUBLIC);
    // optional alarm sound
    tone(buzzer, 2500, 150);
    delay(150);
    tone(buzzer, 2500, 150);
}

void blinkBlue(int times) {
    for (int i=0; i<times; i++) {
        digitalWrite(blueLed, HIGH);
        delay(200);
        digitalWrite(blueLed, LOW);
        delay(100);
    }
}

void decMotionCount() {
    if (motionCount > 0)
        motionCount--;
}

Credits

Andrea S.

Andrea S.

4 projects • 11 followers
Technology enthusiast, problem solver, creative thinker and tinkerer!

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