I have a SmartThings network with a number of Fibaro sensors used for home security (window sensors and PIRs). One device I’ve struggled to find is a compatible external siren. I’ve found internal sirens and I know people use a switched mains socket to activate an external siren. But I want to go a little further and have the external sired on all the time, so the LEDs are working.
I’ve bought a Honeywell external siren (HWAG6S) which a needs a 12v supply to work and needs to be continually powered to work (you interrupt the negative supply to activate the alarm), I understand I need a dry contact relay to activate this through SmartThings. Other than the expensive Fortrezz MIMOlite I haven’t found a way of doing this. Well that was until I discovered Fibaro’s FGS-222 relay switch. Whilst I think it’s intended to switch 110v or 220v the switching contacts appear dry contacts (if you don’t feed the ‘IN’ supply with 110v or 220v) -I’ve tested / proved this on the bench with a multi-meter.
So my question to the forum is… would there be any reason why I couldn’t use the Fibaro relay to activate my alarm sounder? I know I’d need to get a project box to install the 220v > 12v transformer and relay in.