IR Infrared 3 - 100cm Obstacle Detaction Sensor Module

The basic concept of IR(infrared) obstacle detection is to transmit the IR signal(radiation) in a direction and  a signal is received  at the IR receiver when the IR radiation bounces back from a surface of the object.

Features

Test subject (5V)

• White wall : 100cm
• Black laptop : 20cm
• Finger : 18cm
• Palm : 30cm
• Ball pen: 20cm

Connect to Arduino

• 5V => Arduino 5V
• GND => Arduino GND
• OUT => Arduino Digital Pin 13

// IR Obstacle Collision Detection Module

int LED = 13; // Use the onboard Uno LED
int isObstaclePin = 7; // This is our input pin
int isObstacle = HIGH; // HIGH MEANS NO OBSTACLE

void setup() {
    pinMode(LED, OUTPUT);
    pinMode(isObstaclePin, INPUT);
    Serial.begin(9600);
}

void loop() {
    isObstacle = digitalRead(isObstaclePin);
    if (isObstacle == LOW) {
        Serial.println("OBSTACLE!!, OBSTACLE!!");
        digitalWrite(LED, HIGH);
    } else {
        Serial.println("clear");
        digitalWrite(LED, LOW);
    }
    delay(200);
}

Move your hand towards the IR LEDs.  As you near them, the Output LED on the module and the LED for pin 13 on your Arduino will illuminate.  Open your serial monitor and vary the distance of your hand while viewing the serial monitor. The output should show "Clear" to "OBSTACLE!!, OBSTACLE!!".