Hello,
I have a project that I would like to work on that would eventually allow me to monitor and control my home alarm from a remote PC or mobile phone. My alarm panel is a Paradox brand (1728 board) from 2002 that cannot communicate with the outside world except through some Ademco format using a land line.
I am at the very beginning stages of trying to open up this box to a raspberry pi. Not even sure how to do it yet. Would like to have the raspberry pi connect like a keypad on the four wire communication bus. I think the four wires are power, gnd, clock and data.
One of the biggest issues is the voltage difference between the RPI 3.3v and the Alarm 12v. I saw an interesting writeup on using optocouplers to transfer the signal, but that was only one way. This may be the best solution and I was wondering if anyone was familiar with an IC that may already include these ( or some other components ) in a pre-built, 2 way communication.
I have a project that I would like to work on that would eventually allow me to monitor and control my home alarm from a remote PC or mobile phone. My alarm panel is a Paradox brand (1728 board) from 2002 that cannot communicate with the outside world except through some Ademco format using a land line.
I am at the very beginning stages of trying to open up this box to a raspberry pi. Not even sure how to do it yet. Would like to have the raspberry pi connect like a keypad on the four wire communication bus. I think the four wires are power, gnd, clock and data.
One of the biggest issues is the voltage difference between the RPI 3.3v and the Alarm 12v. I saw an interesting writeup on using optocouplers to transfer the signal, but that was only one way. This may be the best solution and I was wondering if anyone was familiar with an IC that may already include these ( or some other components ) in a pre-built, 2 way communication.