An Arduino Laser Security System! Bah, Bah, Bah,Baaaaaaaahhh! It uses simple electronic components, and an easy-to-use sketch. Basically what happens, is the laser shines on a photoresistor that sends an output to the Arduino. When the beam is interrupted, the arduino tells the buzzer to buzz, and the LED to light. So, without further ado, lets get started!
P.S. I wuz having trouble getting a video on here if it doent work, go to this link:
Step 1: Materials
Altoids Tin x 2 (one big, one small)
3 volt button cell battery
Wire (any gauge will do)
Stay-on push button
Hot glue gun/glue sticks