Building a simple web server on ESP32 to remotely control two LEDs in either Access Point or Station mode.
Displaying temperature and humidity readings from a DHT sensor on a self-refreshing web page generated by an ESP32 board.
Using a relay module to control mains-voltage devices via a low-voltage Arduino signal, with important safety notes.
Wiring an addressable WS2812B strip with just three wires, and controlling each LED's color and brightness via the FastLED library.