Using an ESP-32 Devkit to control a relay module over the internet is pretty straightforward. Here’s a quick rundown:

1. Wiring Up: First, connect your relay module to the ESP-32. Hook up the relay’s VCC and GND to the ESP-32’s 3.3V and GND. Then, connect the relay’s input pin to one of the ESP-32’s GPIO pins, like GPIO 23.

2. Setting Up: Install the Arduino IDE on your computer and add the ESP-32 board support. Write a simple program that connects the ESP-32 to your Wi-Fi and sets up a basic web server.

3. Coding: In your code, create a web page with buttons to control the relay. When you open this page in your browser, you’ll be able to switch the relay on or off.

4. Testing: Upload the code to your ESP-32 and open the web page. Click the buttons to see the relay control whatever device you have plugged in.

It’s a neat way to control devices remotely, giving you automation right from your phone or computer!

Hope this helps 😉