Infrared Sensor

In this lesson, we will use the ubiquitous Infrared Receiver and remote control to send signals to our Arduino Uno.

When we get a signal we will blink an LED and output the signal code to the serial monitor so we can record it for later interpretation.

Code

/*
 Read an IR remote and print the code for each button.

 IR receiver: signal to pin 2, plus 5V and GND.
 Written for version 4 of the IRremote library
 (install it from the Library Manager).
*/

#include <IRremote.hpp>

#define RECV_PIN 2

void setup()
{
  Serial.begin(115200);

  // Start the receiver. ENABLE_LED_FEEDBACK flashes
  // the built-in LED (pin 13) whenever a signal arrives.
  IrReceiver.begin(RECV_PIN, ENABLE_LED_FEEDBACK);

  Serial.println("Ready: point a remote at the receiver and press a button");
}

void loop()
{
  if (IrReceiver.decode())
  {
    // One line per signal: protocol, address and command
    IrReceiver.printIRResultShort(&Serial);

    // The command is the short code we use to recognise
    // each button in the remote control lesson
    Serial.print("Command: 0x");
    Serial.println(IrReceiver.decodedIRData.command, HEX);

    // Get ready for the next signal
    IrReceiver.resume();
  }
}

Infrared Sensor

Code

Robot Course Lessons