Hi
I need three 16A (240VAC) smart relays and a couple of temperature sensors for a project.
Shelly can support something similar (especially with addons), but I need to access both the "normally open" and "normally close" terminals of the relay.

I can't find any product that provides that, so my idea now is to get some "basic esp32" board that can be connect to AC and add a relay module to it.

Alternatively I could get an AC/DC transformer and a dev board, but it would probably be easier to start with something already built if it exists.

I'm considering a shelly anyway, and just opening it and using for the main feature - and accessing some unused IO pins for the relays/sensors after flashing it with Tasmota.

Any other more suitable ideas?

Thanks!

 

You can use DIN-rail-mounted industrial relays (e.g., Schneider, Siemens) for robust 16A handling. Pair them with an ESP32 board. Use the ESP32 for control signals to drive relay coils (via transistors or a relay driver IC like ULN2803A).