Are you tired of juggling multiple remotes for your classic TV and sound system? Want the convenience of Alexa voice control without shelling out for expensive smart plugs or replacing your perfectly functional equipment?
Components You Will Need
- 1. ESP32 board https://amzn.to/437V6aN
- 2.USB cable for ESP32 https://amzn.to/47VZj3U
- 3. IR Receiver module https://amzn.to/4qPWrgk
- 4. IR LED Module https://amzn.to/4oXJhfs
- 5. Jumper wires https://amzn.to/47WBjN9
- 6. Amazon Alexa (Echo Dot or any Echo) https://amzn.to/43hMCOd
Step-by-Step Guide: Making Your Devices Voice-Controlled
1. Capturing Your Remote’s IR Codes
The first and most crucial step is to teach the ESP32 the “language” (hex codes) of your TV and soundbar remotes.
- Set up the Arduino IDE: Connect your ESP32 to your computer and open the Arduino IDE. Install the IR remote library.
- Initial Hardware Setup: Place the IR Receiver module on your breadboard.
- Connect the positive leg of the 2.2 microfarad capacitor to the IR receiver’s VCC and the negative leg to GND
- Connect the IR Receiver’s Signal Pin to Pin 15 of the ESP32.
- Complete the power connections: VCC to the ESP32’s 3.3V pin and GND to the Ground pin.
- Capture the Codes:
- Upload the initial code (mentioned below as CODE 1) to the ESP32.
- Open the Serial Monitor, ensuring the baud rate is set to 115200.
- Point your TV remote at the IR Receiver and press the Power Button. The hexadecimal code for that command will appear on the screen.
- Crucially, note down this code and repeat the process for your soundbar remote.
2: Alexa and ESP32 Integration
With the codes saved, it’s time to integrate Alexa.
- Install the ESP Alexa Library
- Update the Main Code: Open the main ESP Alexa example sketch. You will need to edit the code to include your Wi-Fi network credentials and, most importantly, the hexadecimal IR codes you just collected.
- Final Hardware Connections: Remove the IR Receiver and connect the IR Transmitter for the final setup.
- Connect the Signal Pin to Pin 4 of the ESP32.
- Connect the Positive pin to 3.3V and the Ground pin to the Ground pin of the ESP32.
- Upload the Code to the ESP32.
The Final Result
Your DIY smart hub is now complete! You can now use voice commands like “Alexa, switch on the soundbar” or “Alexa, switch off the TV” to control your previously “dumb” devices.
This project proves that with a little code and an affordable microcontroller, you can create a truly DIY Smart Home without relying on expensive, limited commercial products.