Intruder Alarm

Having gained some experience from my Electronic charity box project, I used the same methods and techniques before to make another circuit. This time I made it with the intention of knowing when someone had entered my room. I took apart an intruder alarm used for Garages to try to guage an understanding of exsiting products and how they could work.

After generating some design ideas, I began to identify some inputs, processes and outputs and simulated some designs on circuit Wizard.

I Breadboarded some of the early circuit designs

This is the PCB made for the final circuit

I carried out the same process of making this circuit as I did for the Electronic charity box, Please look there for a closer look. However here is the final circuit board made.