There’s a huge market for 433 MHz alarm ... some code. In his latest video, [Aaron Christophel] shows how easy it can be. In essence, you connect a common 433 MHz receiver module to an ESP32 ...

But instead of getting a whole new system, he decided to upgrade his circa 1993 Gardiner Gardtec 800 alarm with an ESP32. As it so ... be able to use his source code and circuit schematics to ...