Burglar circuit use laser or infrared

[hoachealsea]

Hi, I see burglar circuit use laser or infrared a lot of in internet. But i do not know which one will work. I need circuit diagrams in detail: laser or infrared, components.I do not know much about the circuit please help me.

 

[Misterbenn]

they both will work but achieve completely different things. So you need to work out what you want to do?

laser = trip wire type arrangement for detecting an intrusion
IR = movement detection with large area coverage

A simple google search and you will find circuits / DIY development kits for both types.