uDomotic is a simple small controller for home automation.

It uses an esp8266 to control any load (using relays) and receives opto-isolated 12v inputs.

I/O can be expanded over the i2c bus using pcf8574-based expansion cards. The board fully supports ESPHOME and any other esp8266-based firmware.

The main board, without expansions, can already be used as a standalone anti-theft system by connecting several motion sensors or window sensors in series using the 12v input, and with the output connected to an anti-theft siren.

Alternatively, the system can be installed on electrical panels and, through the additional modules, command the relays used to control the lights in the house.