Firstly, I am a beginner with arduino. I have done some research and tutorials and want to know if this project is feasible.
I have an existing security system that usually contacts a switchboard through a landline when triggered, I want an arduino to notify me when the system is triggered.
Here's my theory, a closed circuit window magnet reads 24 VDC at the security panel, when the circuit is opened (the window is open) it reads an infinite voltage on my multimeter.
If I run a wire from the security panel to a pin on the arduino and use a rising interrupt when a voltage over 24 VDC is detected, I can have the arduino send an email/SMS.
Questions: Is this feasible? Do I need to reduce the 24 VDC coming from the panel?
Sorry if this is a completely ridiculous post, I'm learning :)