the lazy man's window control/rainy day lifesaver!

Author: Joel.Gomez
Created: 2014-04-30
Microcontroller: Digispark
Project: MB Comfort Closure

Monitors OEM fob messages via RS232 from remote engine starter black box and
activates window roll-up on second lock press only if car is already locked.

The remote start black box communicates to the car's ECUs over CAN bus, and offers both control over body functions such as locking/unlocking doors, controlling windows, etc. and can also communicate a status change of the car's inputs. The Digispark monitors the RS232 port of the remote start black box and listens for the message that the car has been locked using the remote key fob. If the Digispark detects that two consecutive lock requests have been sent from the key fob within a short window of time, the Digispark will send the window roll-up request to the black box, and the black box will actuate the windows and moonroof until they are all closed.

Pin 0 - future use
Pin 1 - On Board LED (HIGH = ON)
Pin 2 - future use
Pin 3 - *1.5K pull-up resistor in parallel
Pin 4 - RS232 TX (Blue)
Pin 5 - RS232 RX (Green)

***Note: RS232 data and baud rate have been redacted from source code in an effort to protect any IP rights of the black box manufacturer, but with the right tools, it shouldn't be difficult to reverse engineer this info for your application.

2014-04-30
-first release, includes comfort closure on 2nd lock press