Questions about interfacing a device with my arduino mega

Projects General Guidance
1

i recently moved into a house with an old security system with a broken controller. the only thing that works is the keypad. I'm wondering if i can rebuild the system by using my arduino as the controller and the keypad as a remote to tell the system what to do. or at least see what the keypad is up to using serial monitor. Oh and he keypad is this Ademco 6127 Keypad [Honeywell 6127] - $0.00 : AlarmSuperStore.com, Your One Stop Alarm Shop

2

With enough tinkering you probably could… what matters is not really the keypad but what gets out of it and also how the alarm reports and status checks are performed for your sensors

3

First I’d get the manual for you existing system and see what’s wrong - it could be something simple like a failed backup battery or loose connection . Bell boxes often have batteries too .

I wouldn’t worry about resuming the keypad , that’s probably the easy bit and can be replaced .
There are a lot of alarm projects about from Mr google .
Honeywell do a range of alarm systems that aren’t so expensive as well which are packaged , work well and are reliable .( £100)

4

i'm talking the proccessor in the control panel is broken. and i can't find the plug to attemp to see if it works.

5

as mentioned, that "processor" was handling all the sensors. You will know how they work, report status, etc if you want to use an arduino to do that part of the job. The keypad is a nice to have you can solve for later in my view...

6

I have the sensor protocol figured out and i can communicate with them but i can't communicate with the keypad

7

time to get the scope out :slight_smile:

what does the interface look like? how many wires?

can you share pictures?

8

i don't have a scope or camera but it's just power +- and two data lines. one in and one out

9

oh and here is something that might help: it's not a Wiegand interface that uses 0 and 1 lines for send-only data.

10

do you have a DMM?

without any tool it's hard to know what's the protocol used on those 2 wires or even if they are compatible with your Arduino pins...

12

i could probably use my other arduino(s) as a scope

13

You need first to ensure it’s not 12V or AC

14

it's 5v

15

and dc

16

You could try then with a 5V arduino and see if it’s a binary or analog communication

17

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