Question

Interface Infrared (IR) Sensor with Raspberry-Pi

Answer 1

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.

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

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:

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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)