Schematic DIY KitPhotocell For alarm systems, and to Geschindigkeitsmessung
A classical project of optoelectronics is the light barrier. The police are used as sensors to measure the speed of a vehicle. But also as a sensor of an alarm system has proved itself light barriers or curtains of light interlaced. Here is a selection of links to photoelectric schematics

Here you will find Schematic Circuit Diagram for DIY and further information on Photocell
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Mousetrap with sensor
Velocity measurements for model cars

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