Further inspection revealed that the data line sometimes transitions on falling and other times on rising CLK signal. There are ‘packets’ of data with different sizes, these are clearly visible in the zoomed out window. So obviously the yellow line is a clock one, going at 1Khz, 50% duty cycle. Hooked those to the oscilloscope to see this: I checked the keypad’s wiring and knew that I’d be looking at the green and yellow wires. The MCU is an ATMega16U4. I was expecting the alarm to kick in, but it turns out there is no tamper detection on these. So I wasn’t sure where to start with and took apart one of the keypads that is located in my garage. Of course Paradox offers product to do exactly this, but where is the joy of hacking things? I need R/O access to these, not bi-directional access, that makes the whole setup much easier. Zone statuses would provide me knowledge about indoor movement and help with automation tasks. I can use the alarm status to send myself SMS when the system becomes armed/disarmed or the alarm goes on. I am most interested in its status (armed, disarmed) and the zone statuses. I have a Paradox home security system and I have long wanted to interface with it.
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