Self-arming alarm


Posted on Oct 10, 2012

The circuit has a built-in, self-arming feature. The driver turns off the ignition, presses the arm button on theComputalarm, and leaves the car. Within 20 seconds, the alarm arms itself—all automatically! The circuit will then detect the opening of any monitored door, the trunk lid, or the hood on the car. Once activated, the circuit remains dormant for 10 seconds. When the 10-second time delay has run out, the circuit will close the car`s horn relay and sound the horn in periodic blasts (approximately 1 to 2 seconds apart) for a period of one minute. Then the Computalarm automatically shuts itself off (to -save your battery) and rearms


Self-arming alarm
Click here to download the full size of the above Circuit.

If a door, the trunk lid, or the hood remains ajar, the alarm circuit retriggers and another period of horn blasts occurs. The Computalarm has a "key" switch by which the driver can disarm the alarm circuit within a 10-second period after he enters the door. The key switch consists of a closed circuit jack, Jl, and a mating miniature plug.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Lithium charger circuit
Low Loss Step Down Converter
1976 dodge aspen wiring diagram
light activated relay
pipe descaler schematics
LM1881 LM1881 Video Sync Separator
FM Crystal Controlled Transmitter DPT
Interesting Wiring Schematic



Top