D-0005
PIR Sensor
Description
PIR sensor called: PIR motion sensor.
PIR stands for passive infrared. This motion sensor consists of a fresnel lens, an infrared detector, and supporting detection circuitry.
The lens on the sensor focuses any infrared radiation present around it toward the infrared detector.
Our bodies generate infrared heat, and as a result, this heat is picked up by the motion sensor.
The sensor outputs a 5V signal for a period of one minute as soon as it detects the presence of a person.
It offers a tentative range of detection of about 6–7 meters and is highly sensitive.
When the PIR motion sensor detects a person, it outputs a 5V signal to the Raspberry Pi through its GPIO and we define what the Raspberry Pi should do as it detects an intruder through the Python coding.
Features
- Easy to assemble
- 5V signal
- Adjustable sensitivity
- Compatible with most MCU or Development Board
Specifications
Gallery
Package Includes
How to build a circuit
- Connect Raspberry Pi GPIO to the PIR motion sensor as per the connection diagram below:
How to code in Python
- Typing following code to install RPi.GPIO python liberary.
sudo apt-get update sudo apt-get -y install python3-RPi.GPIO or sudo pip3 install RPi.GPIO
- Edit a file named: pir.py and copy following code and save it.
import RPi.GPIO as GPIO import time GPIO.setwarnings(False) GPIO.setmode(GPIO.BOARD) GPIO.setup(11, GPIO.IN) #Read output from PIR motion sensor GPIO.setup(3, GPIO.OUT) #LED output pin while True: i=GPIO.input(11) if i==0: #When output from motion sensor is LOW print "No intruders",i GPIO.output(3, 0) #Turn OFF LED time.sleep(0.1) elif i==1: #When output from motion sensor is HIGH print "Intruder detected",i GPIO.output(3, 1) #Turn ON LED time.sleep(0.1)
- Run it in a terminal
python3 pir.py