(laser diode used by the author) (laser beam sender circuit diagram) Laser Beam Receiver Circuit. Forepart of this circuit section is a 5mm photoresistor (LDR).This component is used to trigger the ...

As a preview of his latest book, Arduino Project Handbook: 25 Practical Projects to Get You Started, Mark Geddes takes us through the project to create a simple laser trip wire alarm. You've probably ...