The car alarm I developed for my TR7 lies within what appears to be a bit of a mess of circuits and wiring seen in the picture left. The actual circuit is under the buzzer near the middle.
The system and the other bits and pieces are located in a tray which I have made to fit under the dash on the driver’s side (the car is LHD by the way). The original idea was to tidy up the messy collection of odometer and clock reset controls, the bonnet release and the choke which hang under the dash in a rather un-
However, the story behind the alarm system is quite straight forward. A soft top is a very insecure car and I felt a few security measures were justified. For example the door buttons are so easy to access by just un-
The system uses an Arduino linked to an ultrasonic alarm module. I also use the same Arduino to operate the flashers and hazards so it was no problem to link in the alarm. I also fitted a remote switching module utilising a key-
The original reason for converting to electronics for the flashers and hazards was that I wanted to change the existing switch gear for old-
Circuit diagram and software is next.