Hi, I would like to chime in here (pun intended
I am renewing the making smart of my old dumb doorbell, which works on 8V AC.
What i did a several years ago, was to add a Finder relay (22.21.8.008.4000 → NO) in series with the doorbell circuit. That finder Relay has dry output contacts, with a 433 sender attached to it.
Result: when the doorbell was pushed, the 2 existing chimes worked, and as an extra, the Finder relay closed so the sender (433Mhz) sent a signal to an extra wirelsess chime, and the signal was also picked up by my RFXCom.
I would like to eliminate the RFXCom, and the 433 MHz protocol, by adding a Shelly Uni Plus.
The Shelly has its power from the 8VAC doorbell trafo, that works good.
I would now like the dry contacts from the Finder relay as input for the Shelly, to detect the Doorbell push. I used the GND (green, 7th wire) and the IN1 (orange, 9th wire) for that, but that gives me a constant push.
Has someone an idea how to wire a simple short circuit (like a button press) as input for the shelly uni plus?
I can also see in HA events happening.
The issue I have is that the sender device for 433 MHZ is also still connected (attached them in parallel), but that device keeps getting continuous signal, like it 's short circuited fulltime, that’s what makes me think this is not ok.
I manually shorted Gnd and IN1, that gives me 3 events in HomeAssistant…
