The Nova receiver has a 10A 220V AC rated relay which you wire NO as the light switch (but for this you obviously need a separate permanently connected 12V supply for the receiver at the light). Have a Nova receiver paired with the "alarm light remote" at/near your light. Wire an actual button remote (like a nova, 1/2/4 button remote) again on the alarm output (those tiny remote batteries are 12v so I think 12V from the alarm should not kill the remote (like it will if you wire it directly to a sonoff which runs 3.3V). Stepping down the alarm's 12v to 3.3V and bypassing the Nova receiver completely could also be an option. a second sonoff acting as your light switch receives input, via home assistant that a button was pressed which requires sonoff2 to switch on. In short, get a remote receiver like a Centurion Nova receiver, wire the alarm output as 12V power source to the receiver, adapt a basic sonoff so that you have wires from the sonoff's physical button to the Nova Receiver relay wired as Normally Closed - when the alarm output triggers, it powers up the Nova Receiver and with the relay wired a NC it "presses" the button on the sonoff. I do think it will trigger the light more reliably than option 2. I do not see it working without more parts. One option would be WiFi switches like the sonoffs and such, but without going full tilt and adding home assistant (running on a RPi etc). I am pretty sure there are likely neat out of the box options or much more elegant ways from the more electronically gifted but if wanting to MaCgyver/Frankenstein it I would have tried the following (you will need to have 12V close to you light though and/or 230V close to the alarm output and solder a wire or two). How do i use this signal to switch on the lights? The system would have to operate wireless. The alarm system (Paradox) has programmable PGM outputs (12V 700mA) i could use to generate the required "on" signal. I would like the alarm system to switch on the outside lights if an alarm is triggered.
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