I want to hook my home security system's alarm into my Raspi, so whenever the alarm is triggered, my Raspi sends me a text message.
The gentleman who installed the system said whenever the siren goes off, current is running through pins 3 and 4. According to the attached picture (wiring diagram) this looks correct.
My Question :
Based on the wiring diagram, would It be ok to attach wires from Pins 3 & 4, directly to the Raspi 2 pins? Notice It says 12.5vdc to 10.9vdc, and something that looks to be a value of 2.2k. What do I need to do to safely read/get the voltages into the Raspi?
I appreciate any help In advance!