Franklin Dattein

Plug it and Arduino can sense your presence of object by infrared!

Original post on Ebay

The Infrared Reflectance Sensor Module carries a single infrared LED and phototransistor pair in an inexpensive, tiny module that can be mounted almost anywhere and is great for obstacle detection of robot and home alert system. The optimal sensing distance is within 50cm (20 inches).

Building interactive work is as easy as piling bricks, just plug it to our Arduino Sensor Shield with a buckled cable, and make it looks professional and neat.

The Infrared Reflectance Sensor Module simply gives a digital signal when it detects infrared reflection from a person or object, so the code is exactly as the one we would use for a pushbutton. Please be noted that, when reflection is detected, it gives a “low” value.

int ledPin = 13;       // choose pin for the LED
int inputPin = 2;      // choose input pin (for Infrared sensor)
int val = 0;           // variable for reading the pin status

void setup() {
  pinMode(ledPin, OUTPUT);   // declare LED as output
  pinMode(inputPin, INPUT);  // declare Infrared sensor as input
}

void loop(){
  val = digitalRead(inputPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    digitalWrite(ledPin, LOW);  // turn LED OFF
  } else {
    digitalWrite(ledPin, HIGH); // turn LED ON
  }
}








red light at the back to show presence of object