Has anyone looked into hardwiring anything on the back of their ADT Smartthings Panel? It’s clearly not designed for this, but probing around on the back of the circuit board it looks like there are a few inputs and outputs that could be utilized with a little bit of soldering work.
I was specifically looking to integrate a second siren to the panel since the built-in one is too quiet, and I’m replacing a panel that already had an auxilliary siren installed. I realize I can do a z-wave or zigbee siren, but it would be nice to have a siren that is not dependent on the cloud, just like the built-in siren.
I noticed there was bell + and bell - on the back, but I’m measuring 13.5VDC when there is no alarm active, and 14.0VDC when the siren is active. However I haven’t played around enough to know whether the 13.5VDC is ghost voltage and would disappear when a minimal load is applied.
Before I spend too much time on this, I’d like to know if anyone has looked into this.
I did also notice that the zone 1 and zone 2 have 5VDC relative to COM, so it’s possible that they might be useful with hardwired sensors. But I haven’t looked further on those either.