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Anti-theft alert system design for vehicles

Posted: 09 Jul 2012 ?? ?Print Version ?Bookmark and Share

Keywords:transmitter? receiver? antitheft alert?

Here's a design idea that presents a simple circuit that consists of a transmitter/receiver pair and functions as an automobile antitheft alert system. The premise for the design is straightforward. You place the transmitter in a vehicle parked outside your home and leave the receiver in your house. When the vehicle leaves the area, this circuit sounds an alarm because the distance between the transmitter and receiver increases and the received power level falls below a predetermined level (threshold). The circuit is, in effect, warning of a potential auto theft. This circuit can also be applied to other applications for security purposes, such as securing USB flash drives or monitoring a child's presence.

View the PDF document for more information.

Originally published by Maxim Integrated Products at as "ASK Transmitter/Receiver Pair Serves as an Automotive Antitheft Alert System".

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