In essence, you connect a common 433 MHz receiver module to an ESP32 or ESP8266 microcontroller ... have it toggle a relay hooked up to a loud siren. Even if you aren’t looking to make your ...

This is demonstrated once again, this time on the ESP32 by [aquaticus] with a library that generates PAL/SECAM and NTSC composite signals. As a finishing touch on the hardware side, [aqaticus ...