Arduino with PIR

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Hi friends! I am back ones again to share with you my simple but useful project and step by step descriptive video to show you, how you can auto turn on the room Light when some come inside the room. It’s only work when someone moving in the room and after few second light will turn off automatically. To detect the motion I have used PIR Motion Sensor and program the arduino board to read the sensor signal and turn on the light for few second.

List of components to make this prototype:

• Arduino Uno
• PIR motion sensor
• LED
• Jumper wire
• PIR motion sensor with Arduino video tutorial

Arduino code for PIR Motion Sensor prototype

intcalibrationTime = 30;

//the time when the sensor outputs a low impulse

longunsigned intlowIn;

//the amount of milliseconds the sensor has to be low

//before we assume all motion has stopped

longunsigned intpause = 5000;

boolean lockLow = true;

boolean takeLowTime;

intpirPin = 12; //the digital pin connected to the PIR sensor's output

intledPin = 13;

////

//SETUP

voidsetup(){

Serial.begin(9600);

pinMode(pirPin, INPUT);

pinMode(ledPin, OUTPUT);

digitalWrite(pirPin, LOW);

//give the sensor some time to calibrate

Serial.print("calibrating sensor ");

for(inti = 0; i < calibrationTime; i++){

Serial.print(".");

delay(1000);

}

Serial.println(" done");

Serial.println("SENSOR ACTIVE");

delay(50);

}

//LOOP

voidloop(){

if(digitalRead(pirPin) == HIGH){

digitalWrite(ledPin, HIGH); //the led visualizes the sensors output pin state

if(lockLow){

lockLow = false;

Serial.println("---");

Serial.print("motion detected at ");

Serial.print(millis()/1000);

Serial.println(" sec");

delay(50);

}

takeLowTime = true;

}

if(digitalRead(pirPin) == LOW){

digitalWrite(ledPin, LOW); //the led visualizes the sensors output pin state

if(takeLowTime){

lowIn = millis(); //save the time of the transition from high to LOW

takeLowTime = false;

}

//if the sensor is low for more than the given pause,

//we assume that no more motion is going to happen

if(!lockLow && millis() - lowIn > pause){

//makes sure this block of code is only executed again after

//a new motion sequence has been detected

lockLow = true;

Serial.print("motion ended at "); //output

Serial.print((millis() - pause)/1000);

Serial.println(" sec");

delay(50);

}

}

}

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