As the ultimate anti-theft alarm device in sci-fi movies, laser alarm device has its invisible infrared ray available for experience and utilization, allowing you to catch the thief easily… Actually, it can be also used in this way.
Your pet at home may be disobedient or go to a prohibited place. Why not making a laser anti-theft alarm emitter if you have no time to guard it?
Today, I will introduce a simple laser alarm device model to you.
Principle: A laser emitter sends a light beam and another laser receiver receives the laser beam. When the connection is established, the alarm will be triggered if any object blocks the laser beam.
Measure relevant dimensions of laser emitter and receiver with vernier caliper and record such dimensions for using during user modeling.
Support of laser reception terminal
Base of laser reception terminal
Finished installation of reception terminal
Installation of receiver
Support of laser emission terminal
Support base of laser emission terminal
Support and support base
Insertion of support into the support base
Completion of emitter terminal
If you think one is not enough, you may make multiple alarm devices!
read original artical:https://www.dfrobot.com/forum/viewtopic.php?f=2&t=2906