I've found an laser alarms system diagram on the internet but I am not sure how to test or use it on a breadboard. I need some help converting the diagram to something physical on the breadboard.
Heres the link to the diagram:
http://www.instructables.com/file/FHEWL9TFD80BUXE/
Heres the link to the diagram:
http://www.instructables.com/file/FHEWL9TFD80BUXE/