COMPUTALARM

Published:2009/6/22 23:25:00 Author:Jessie | From:SeekIC

The circuit has a built-in, self-arming feature. The driver turns off the ignition, presses the arm button on the Computalarm, 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 acti-vated, the circuit remains dormant for 10 sec-onds. When the 10-second time delay has run out, the circuit will close the car's horn relay and sound the ham in periodic blasts (approxi-mately 1 to 2 seconds apart) for a period of one minute. Then the Computalarm automatically shuts itself off (to save your battery) and re-arms. If a door, the trunk lid, or the hood re-mains ajar, the alarm circuit retriggers and another period of horn blasts occurs. The Com-putalarm 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, J1, and a mating miniature plug.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Control_Circuit/COMPUTALARM.html

Print this Page | Comments | Reading(3)