Description
Transmitter launch a certain frequency infrared, when meet obstacle in the detection direction, the infrared receiver is reflected back by the receiver tube, after processing through the comparator circuit, the green indicator light will illuminate while the signal output interface output digital signal (a low-level signal) can be adjusted via potentiometer.
Specifications:
The module detects the distance 2 ~ 30cm, detection angle 35 °,
The sensor module output port OUT can be directly connected with the microcontroller
IO port can also be driven directly to a 5V relay
It uses a stable comparator which is LM393
The module is supplied with 3-5V DC power
OUT : digital output interfaces (0 and 1);
Getting started with the Obstacle Infrared Sensor module
The device consists of an Infrared Transmitter, an Infrared Detector, and support circuitry. It only requires three connections. When it detects an obstacle within range it will send an output low.
 
Hardware required
Obstacle Infrared Sensor module
Arduino UNO
Jumper wires
Obstacle Infrared Sensor module Pin Outs
 
Sample arduino codes 
Copy and Paste to your arduino IDE
 
//AMOTECH ELECTRONICS_Initiate,Integrate,Innovate
//Codes for obstacle detection
#define IRSensor 2  // IR Sensor output pin
 
void setup() {
  pinMode(IRSensor, INPUT);
  Serial.begin(9600);  // Initialize Serial Monitor
  Serial.println("IR Sensor Test Starting...");
}
 
void loop() {
  int sensorValue = digitalRead(IRSensor);
  if (sensorValue == LOW) { // Most IR sensors output LOW when object detected
    Serial.println("Object Detected!");
   
  }
  else {
    Serial.println("No Object Detected");
  }
 
  delay(500); // Adjust delay as needed
}
 

Test the Tutorial Sketch

Move your hand towards the Obstacle Infrared Sensor module . Open your serial monitor and vary the distance of your hand while viewing the serial monitor.
 
Package includes:
1×IR Infrared Obstacle Avoidance Sensor Module