Introduction

Today, we're going to learn about the Infrared Transmitter. 

In this guide, we will program an Arduino and use it with an IR transmitter to play a prank! We will get it to turn a TV off. 

After completing this guide, you will gain familiarity with the IR transmitter and can go on to use it in further projects! 
    • Insert your Infrared Transmitter into your breadboard so that the cathode (short leg) is on the left-hand side and the anode (long leg) is on the right-hand side.

    • Insert your 220 Ohm resistor so that one of it's legs vertically in line with the LED's anode (long leg).

    • Run a jumper wire from an Arduino Ground Pin (GND) to the IR Transmitter cathode.

    • Run another jumper wire from pin 3 so that it's vertically in line with the resistor's other leg.

    • Install the IRremote Library.

  1. #include <IRremote.h>
    
    IRsend irsend;
    
    void setup()
    {
    
    }
    
    void loop() {
    	for (int i = 0; i < 3; i++) {
    		irsend.sendSony(0xa90, 12);
    		//irsend.sendSAMSUNG(0xE0E040BF, 32);
    		//irsend.sendNEC(0xF4BA2988, 32);
    		//irsend.sendPanasonic(0x4004, 0x100BCBD);
    		//irsend.sendLG(0x880094D, 28);
    
    		delay(40);
    	}
    	delay(5000); //5 second delay between each signal burst
    }
    • This code will by default send a command to turn on and off a Sony television. Uncomment out your brand of Television to make the code work for your TV.

    • Upload the code to your Arduino and bring your Arduino close to your TV (you might want to use the battery connector).