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Laser beam Sensor

2014-11-01 22:43  
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The sensor has two parts: a transmitter and a detector. They can be placed on opposite sides of your victim's path, or they can both be on the same side using a mirror to reflect the beam back. They should be placed 6 to 12 inches from the floor/ground to prevent their being seen. visit page.Laser beam Sensor - schematic
Adjust the time period with R2 (Radio Shack #271-211 $1.50) which shortens the time period by charging C1 faster, or leave out R2 and simply change the size of C1. A 470uF capacitor (Radio Shack #272-1018 $1) can give up to 60 seconds, but that will vary visit page.