Hi folks I am back once 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 someone come inside the room. It’s only work when someone moves in the room and after a few second lights 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 a few seconds.
List of components to make this prototype.
- Arduino UNO
- PIR Motion Sensor
- LED
- Jumper Wire
PIR Motion Sensor with Arduno Video tutorial.
Arduino code for PIR Motion Sensor prototype
//the time we give the sensor to calibrate (10-60 secs according to the datasheet) int calibrationTime = 30; //the time when the sensor outputs a low impulse long unsigned int lowIn; //the amount of milliseconds the sensor has to be low //before we assume all motion has stopped long unsigned int pause = 5000; boolean lockLow = true; boolean takeLowTime; int pirPin = 3; //the digital pin connected to the PIR sensor's output int ledPin = 13; ///////////////////////////// //SETUP void setup(){ Serial.begin(9600); pinMode(pirPin, INPUT); pinMode(ledPin, OUTPUT); digitalWrite(pirPin, LOW); //give the sensor some time to calibrate Serial.print("calibrating sensor "); for(int i = 0; i < calibrationTime; i++){ Serial.print("."); delay(1000); } Serial.println(" done"); Serial.println("SENSOR ACTIVE"); delay(50); } //////////////////////////// //LOOP void loop(){ if(digitalRead(pirPin) == HIGH){ digitalWrite(ledPin, HIGH); //the led visualizes the sensors output pin state if(lockLow){ //makes sure we wait for a transition to LOW before any further output is made: 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; //make sure this is only done at the start of a LOW phase } //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); } } }
sir its very urgent i made this project but the led is always on it is not turning off it shows motion detected at 30s but the motion never ends
hi aravind I think the pir sensor is spoilt. I had the same issue, bought a new pir sensor, plugged it in and now it works!
Hello, i would like to ask. after constructing all the component and upload the code into board.
there are no changes on led after calibrating, motion detected all the time.
covering the pir motion using cardboard, also did not response well.
the led doesnt blink just like demonstration video.
thank you.
hye, if i’m not using LED, how can i know the sensor detect motion or not?
you can see the light on the Arduino Uno board it have a light on it
hi sir
program error
56 digitalWrite(ledPin, LOW);
“LedPin was not declared in this scope”
you can guide me how to fix it?
thanks
you had to make the pins 3 and 13 integers
int pirPin = 3;
int ledPin = 13;
great tut. I want more
Cannot verify this program because Serial.printIn(“sec”); was error. So how?
if the led turns on then the PIR sensor senses motion and if it turns off then the PIR sensor doesn’t sense motion
mine will not program
it just says it is not allowed here
i need someone that is good at sensors in arduino helping me in my final project
bonus is offer!
Hi there, I’ve follow your step and use your code. But, the project doesn’t work as well, the PIR Motion Sensor doesn’t effect the LED even I’ve shake my hand to the sensor. Can you help me to solve this problem?
Can any one give code explanation for documentation
How to change the duration of light?
Hello sir, can u please suggest code for Send IR sensor data to live server(database)?
Which language is the code written in?
Thank you so much dude ı looked to much videos but its didnt work
But ı watched your video and its worked and you told very simple way
Why if i’m going to run this mesge appear “LockLow was not declared in this scope “
I am really struggling with my PIR Motion sensor! Using this code and set up my sensor correctly detected the motion of my hand 3 times, but after that, it seems to have stopped and no longer was detecting motion. Thoughts?
Sir i am running into an issue.
A pir sensor should go on when it detects an heat source.
The problem is when i throw a large karton box in front of it then it goes off.
How do i adjust it from motion sensor to Pir function.
I want it only when a human or a large dog goes off.
Not when my curtains are moving in the wind.