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Working of Infrared (IR) Sensor

Interface Infrared (IR) Sensor often used as Obstacle Detecting Sensors or Proximity Sensors. An IR Sensor Module basically consists of three parts: an IR Transmitter, an IR Detector and a control circuit.

Usually, an IR LED is used as an IR Transmitter and a Photo Diode or a Photo Transistor (less often) is used as an IR Detector. The control circuit consists of a Comparator IC with necessary components.IR Sensor in IoT with Raspberry-PI training in Jaipur

Infrared (IR) Sensor Specification:

  • 5VDC Operating voltage
  • I/O pins are 5V and 3.3V compliant
  • ange: Up to 20cm
  • Adjustable Sensing range
  • Built-in Ambient Light Sensor
  • 20mA supply current
  • Mounting hole

Components of IR Sensor

  • Emitter: This component continuously emits the infrared signal
  • Receiver: It waits for the signal which is bounced back by obstacle
  • Indicator: On board LED to signal if obstacle is deducted by the sensor
  • Output: Could be used as Input for further processing of the signal
  • Ground: Ground/Negative point of the circuit
  • Voltage: Input voltage point of the circuit

 Infrared (IR) Sensor Pinout:

Pin Name

Description

VCC

Power Supply Input

GND

Power Supply Ground

OUT

Active High Output

 Connection: IR sensor to Raspberry-PI

IR Sensor connection with Raspberry-PI

  1.      Connect Vcc Pin of IR sensor to 5v Pin of Raspberry-pi (We are Using PIN 2)
  2.    Connect Ground Pin of IR sensor to Ground Pin of RASPBERRY-PI (We are Using PIN 6)
  3.     Connect Out PIN of IR sensor to GPIO PIN of Raspberry-PI (We are Using PIN 40) 

Python Program:


import RPi.GPIO as GPIO

import time

GPIO.setmode(GPIO.BOARD)

GPIO.setwarnings(False)

GPIO.setup(40,GPIO.IN)

while(1):

        state=GPIO.input(40)

        if state==False:

                time.sleep(1)

        else:

                print("Object Detected")

                time.sleep(1)

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