So, to use the ESP-01 Wi-Fi Relay, you must first program the ESP module that comes with the kit. After programming, you can plug your ESP module correctly on the ESP socket of the relay board. In the ...

In a recent article in Elektor magazine, [Clemens Valens] describes the construction and software for an ESP32 walkie-talkie system that uses ESP-NOW for the wireless connection between units, alon… ...