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 ...

The ESP32 series of microcontrollers have been with us for quite a few years now, providing a powerful processor and wireless connectivity for not a huge outlay. We’ve seen a bunch of versions ...

The 4 channel smart relay board is powered by a ESP32 WROOM providing the ability to safely control up to four appliances or devices on a load of 110-250 VAC/7A, 30 VDC/10A depending on your needs.