Alarm bell box with A16 outputs

[Knightrider]

I have just ordered an A16 to replace my wired ESP32-based alarm system (using home assistant and ESPHome).

My alarm bell box has a constant 12v supply, and activates the siren by pulling the trigger to ground:

https://www.amazon.co.uk/External-Wired-...PAHGN6WB8C

Currently, I use low level outputs from the ESP32 board to trigger 5v relays to pull to ground.

If I am correct, the A16 outputs at 12v.  In order to achieve the same result (pulling the siren trigger to ground) am I correct in thinking that I would need to replace the relays with ones that trigger at 12v?

Is anyone using the A16 already with a typical Bell box as the one shown?

[admin]

KC868-A16 digital input short with GND = trigger. then you can make IFTTT let OUTPUT voltage to your siren.

[twostar]

Got the same issue, just set the output you're using to "invert output" to trigger the siren.

One thing to be aware of however is that this setting doesn't take effect until the board has booted, so whenever you restart it the alarm will sound for a few seconds until it's finished booting.

[Knightrider]

Got the same issue, just set the output you're using to "invert output" to trigger the siren.

One thing to be aware of however is that this setting doesn't take effect until the board has booted, so whenever you restart it the alarm will sound for a few seconds until it's finished booting.

That's really helpful - thanks.  Would be good to avoid any external relays of not needed . My existing setup has the same behaviour - alarm sounds briefly when booting.  Not really too much of an issue.