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IR Sensor Infrared Obstacle Avoidance Module

Detection distance: 2 ~ 30cm
Detection angle: 35 °
Comparator chip: LM393
3mm screw holes for easy mounting

SKU: AB072 Categories: PIR / IR and Optical Sensor, Sensors Tag: Sale

35,00 EGP

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Description

Infrared Obstacle Avoidance IR Sensor Module (Active Low) has a pair of infrared transmitting and receiving tubes. When the transmitted light waves are reflected back, the reflected IR waves will be received by the receiver tube. The onboard comparator circuitry does the processing and the green indicator LED comes to life.

The module features a 3 wire interface with Vcc, GND, and an OUTPUT pin on its tail. It works fine with 3.3 to 5V levels. Upon hindrance/reflectance, the output pin gives out a digital signal (a low-level signal). The onboard preset helps to fine-tune the range of operation, the effective distance range is 2cm to 30cm.

Features:

Easy to assemble and use
Onboard detection indication
The effective distance range of 2cm to 30cm
A preset knob to fine-tune distance range
If there is an obstacle, the indicator lights on the circuit board.

Package Includes :

1 x Infrared Obstacle Avoidance IR Sensor Module (Active Low)

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Pin Connections

1 Table

Pin Connections Table 1

Arduino Uno	IR Obstacle Sensor	Connection Details
5V	VCC	Power supply for the IR sensor
GND	GND	Common ground
Digital Pin 2 (D2)	OUT / DO	Digital output signal from sensor (Supports Interrupts)

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IR Sensor Infrared Obstacle Avoidance Module

2 Examples • C/C++

Wrap Dark

Method 1: Basic Digital Polling

Method 2: Hardware Interrupts

Code Comments:

This section uses basic digitalRead() polling in the main loop to check the sensor state.

📄 File: method_1:_basic_digital_polling.inoArduino Uno

1268 characters

1/*

2 * ekostra.com

3 * ekostra electronics store in egypt

4 */

6// Define the pins connected to the IR sensor and LED

7const int irSensorPin = 2; // IR sensor OUT pin connected to Digital Pin 2

8const int ledPin = 13; // Built-in LED on Digital Pin 13

10// Variable to store the sensor state

11int sensorState = 0;

13void setup() {

14 // Initialize serial communication at 9600 bits per second

15 Serial.begin(9600);

17 // Set the IR sensor pin as an input to read signals

18 pinMode(irSensorPin, INPUT);

20 // Set the LED pin as an output for visual feedback

21 pinMode(ledPin, OUTPUT);

23 Serial.println("IR Sensor Polling Started");

24}

26void loop() {

27 // Read the current state of the IR sensor

28 // Note: Most IR obstacle sensors pull the line LOW when an obstacle is detected

29 sensorState = digitalRead(irSensorPin);

31 // Check if the sensor state is LOW (obstacle detected)

32 if (sensorState == LOW) {

33 // Turn on the built-in LED to indicate an obstacle is present

34 digitalWrite(ledPin, HIGH);

35 Serial.println("Obstacle Detected!");

36 } else {

37 // Turn off the LED when the path is clear

38 digitalWrite(ledPin, LOW);

39 Serial.println("Path Clear");

40 }

42 // Small delay to stabilize sensor readings and prevent serial flooding

43 delay(100);

44}

Code Comments:

This advanced method uses an Interrupt Service Routine (ISR) so the Arduino doesn't have to constantly poll the sensor in the main loop.

📄 File: method_2:_hardware_interrupts.inoArduino Uno

1524 characters

1/*

2 * ekostra.com

3 * ekostra electronics store in egypt

4 */

6// Define the pins

7// Pin 2 is used because it supports external hardware interrupts on the Arduino Uno

8const int irInterruptPin = 2;

9const int ledPin = 13;

11// Volatile boolean variable since it is modified inside an Interrupt Service Routine (ISR)

12volatile bool obstacleDetected = false;

14// Interrupt Service Routine (ISR) function

15// This function runs automatically independent of the main loop when the pin state changes

16void handleObstacle() {

17 // Read the pin state directly during the interrupt

18 if (digitalRead(irInterruptPin) == LOW) {

19 obstacleDetected = true; // Obstacle is currently present

20 } else {

21 obstacleDetected = false; // Obstacle has been removed

22 }

23}

25void setup() {

26 // Initialize serial monitor

27 Serial.begin(9600);

29 // Configure pins for input and output

30 pinMode(irInterruptPin, INPUT);

31 pinMode(ledPin, OUTPUT);

33 // Attach the interrupt to the sensor pin

34 // 'CHANGE' triggers the ISR whenever the pin toggles from HIGH to LOW or LOW to HIGH

35 attachInterrupt(digitalPinToInterrupt(irInterruptPin), handleObstacle, CHANGE);

37 Serial.println("IR Sensor Interrupt Mode Started");

38}

40void loop() {

41 // The main loop only checks the flag updated by the ISR

42 // This frees up the loop to run other non-blocking code!

43 if (obstacleDetected) {

44 digitalWrite(ledPin, HIGH);

45 } else {

46 digitalWrite(ledPin, LOW);

47 }

49 // Main loop logic can continue here without waiting for the sensor

50 delay(50);

51}

Project Notes:

This project demonstrates two methods for interfacing an IR Obstacle Avoidance sensor with an Arduino Uno: standard digital polling and hardware interrupts.

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Specification

General

WeightWeight	7,0000 g
Dimensions	4,8 × 14 × 8 cm
main-chip	LM393
operating-voltage-vdc	3.6 ~ 5
average-current-consumption-ma	0.06
detection-angle	35 Â°
distance-measuring-range-cm	2 ~ 30