DIY IR Remote Control Switch

 

Project 7: DIY IR Remote Control Switch

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Objective:

To build a DIY Infrared (IR) remote control switch that can turn ON/OFF an LED (or appliance) using a TV/DVD remote.

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Components Required:

1. IR Receiver Module (TSOP1738)
2. Arduino Uno (or ATtiny85 for a compact design)
3. NPN Transistor (BC547)
4. Resistors – 220Ω, 1KΩ, 10KΩ
5. Relay Module (5V)
6. LED (or appliance)
7. Power Supply (9V Battery / 5V Adapter)
8. Breadboard & Wires
9. Any IR Remote (TV, DVD, etc.)

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Circuit Diagram:

(A schematic can be designed in Fritzing or Tinkercad.)

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Step-by-Step Instructions:

Step 1: Connect the IR Receiver Module

• TSOP1738 has 3 pins:
  • VCC → 5V
  • GND → GND
  • OUT → Arduino Digital Pin (D2)

Step 2: Decode the Remote Signals

• Upload an IR decoding sketch to Arduino using the IRremote library.
• Open the Serial Monitor and press buttons on the remote.
• Note down the unique HEX codes of the buttons.

Step 3: Control the LED/Relay

• Program Arduino to toggle the LED/Relay when a specific IR code is received.

Step 4: Power the Circuit

• Use a 9V battery or 5V adapter for stable operation.

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Code for Arduino:

cpp
#include <IRremote.h>

int RECV_PIN = 2;
int LED = 7;
IRrecv irrecv(RECV_PIN);
decode_results results;

void setup() {
  Serial.begin(9600);
  irrecv.enableIRIn();  
  pinMode(LED, OUTPUT);
}

void loop() {
  if (irrecv.decode(&results)) {
    Serial.println(results.value, HEX);
    if (results.value == 0xFFA25D) { // Replace with your remote's button code
      digitalWrite(LED, !digitalRead(LED)); // Toggle LED
    }
    irrecv.resume();
  }
}

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How It Works:

1. The IR receiver detects remote signals.
2. Arduino decodes the signal and checks the button code.
3. If the button matches, it toggles the LED/Relay ON or OFF.
4. The appliance/light operates like a remote-controlled switch.

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Customization Ideas:

💡 Control multiple appliances using different remote buttons.
💡 Use ATtiny85 for a compact and low-power version.
💡 Add a display to show which device is ON/OFF.

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