My house came with 28 sensors, contacts, motions, smokes, etc…
It was actually one of my first custom ventures that started off with just a, “it would be so cool if I could arm/disarm the DSC Alarm System via SmartThings”… A few searches later, I came across this thread:
In hind-site, it was super easy to setup. Just needed a Pi3 and the EVL-4 module and some knowledge of working with custom codes. However, I had Zero knowledge working in Linux and/or custom codes.
That’s where this awesome forum come into play!
After I got it up and running, I was SUPER excited because it also gave me full access to everything including the Smokes, COs and Glass-breaks.
So full professional monitoring and 28 useable sensors for $100 was well worth the learning curve.
IMHO, custom apps and custom handlers is what makes ST so darn powerful. Once you get your head around it, the sky is the limit.