Operation of the Device

The alarm operates as follows: 

Button

Function

Arm

- An LED in the car is turned on

- Display lights flash in a sequence to show that the car is armed

- Power to the ignition is cut off via a relay

Panic

- The hazard lights are turned on and the horn is honked repeatedly

Disable

- Turns off the alarm and the panic lights and returns power to the ignition

Table 1:  Alarm Buttons 

There are sensors on the two front doors in the prototype.  This is easily extended to all doors.  When the car is armed and the perpetrator opens one of the doors the alarm is tripped.  This causes the hazard lights to go on and the horn to honk repeatedly.