Control Light Room With Arduino and PIR Motion Sensor
Intro: Control Light Room With Arduino and PIR Motion Sensor
Today, we will see together how you can create an Arduino PIR motion sensor for your room in order to turn ON/OFF the light by detecting human movements.
PIR sensor:
The PIR sensor stands for Passive Infrared sensor. It is a low cost sensor which can detect the presence of Human beings or animals. There are two important materials present in the sensor one is the pyroelectric crystal which can detect the heat signatures from a living organism (humans/animals) and the other is a Fresnel lenses which can widen the range of the sensor. Also the PIR sensor modules provide us some options to adjust the working of the sensor as shown in above image.
STEP 1: Supplies
Pick up the supplies required :
1. Arduino Uno
2. PIR motion sensor
3. Relay module
4. Some Wires
5. Lamp
STEP 2: Connecting the Sensor and the Components
The PIR sensor has three pins :
1. VCC
2. GND
3. OUT
We have powered the PIR sensor using he 5V Rail of the Arduino. The output pin of the PIR Sensor is connected to the 4thdigital pin.Then, you have to wire the ''GND'' to the Arduino's ''GND''.
In this project, we use relay for controlling AC light because the Arduino cannot control high volt , but a relay can do this job, which is the sole design of it. so we are using relay as switch to control high power devices.
There are two ways to assembly the relay connection :
1. NC = Normally Closed Connection ( which I'm going to use ).
2. NO = Normally Open Connection.
so you have to wire the relay's ''OUT'' to the 8th digital pin of the arduino uno.Then the relay's ''GND'' to the arduino's ''GND'' and ''VCC'' to the ''VCC''.
NOTE: The wires are assembled as you see in the pictures above.
STEP 3: Watch
STEP 4: Programming
int lamp = 8; // choose the pin for the RELAY
int inputPin = 4; // choose the input pin (for PIR sensor)
int val = 0; // variable for reading the pin status
void setup() {
pinMode(lamp, OUTPUT); // declare lamp as output
pinMode(inputPin, INPUT); // declare sensor as input
Serial.begin(9600);
}
void loop(){
val = digitalRead(inputPin); // read input value
Serial.println(val);
if( val== 1) {
digitalWrite(lamp,HIGH); // turn ON the lamp
} else {
digitalWrite(lamp,LOW); // turn OFF the lamp
}
}
STEP 5: For Support
You can subscribe to the my YouTube channel for more tutorials and projects.
Subscribe for support. Thank you.
Go to my YouTube Channel -link https://goo.gl/EtQ2mp
14 Comments
andrewdixen2022 3 years ago
ArshadK21 4 years ago
hackplague 4 years ago
kadirciftci 4 years ago
I have Used on my garage.
bbianciot 6 years ago
Hello,
thank you to share with us this project.
I have a similar project. I would like to turn on a LED strip slowly with a kind of wave light intensity when someone comes near the sensor ? How can i do that. I have no experience but i'm willing to learn more.
Thank you for your help.
Bye
Baptiste
EmeraldS5 5 years ago
Have you had any luck? :)
maxwega 6 years ago
your image shows a diode/resistor connected between the relay and Arduino on the breadboard, but you have not mentioned about it in the article nor in the supply list. So just asking, what is it and do we need it?
Smart Technology 6 years ago
RajM85 5 years ago
oh thank god..i think its a photoregister..am i right?
RajM85 5 years ago
same question..
sidaqdeep1 6 years ago
WOULDNT AN nc(NORMALLY CLOSED CONNECTION BE ON ALL THE TIME AND turn off the light on motion?
FlyingDrMike 6 years ago
Yes you are correct. Mike
AakashR10 6 years ago
Smart Technology 6 years ago