This is a very simple circuit to make using a 555 component and is recommended for the electronics beginner.
This page outlines how to make a simple theft detterant which may be just as effective. The idea is to have a flashing red led indicate that your car is protected. This device can protect your vehicle from potential thieves – it makes it look like your car has an armed alarm system installed, which causes thieves to pass by your car in search of an easier target.
This tutorial will guide you through the process of creating your first Microchip PIC microcontroller based circuit.
It will cover everything that needs to be done in order to write a simple program that will blink a LED, in a step-by-step “hands-on” method. All the software used in this tutorial is absolutely free. All you need is a simple JDM programmer (read on for detials), and you are good to go!