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The best thing I have made recently are couple of sensors for my elevator project.
I took a IR sensor, Photo Transistor, couple of resistors, NPN and a LED to make a circuit. Where If i interrupt the beam of light emitting from the IR to the PT, the output will be a LOW '0'.
Applications where this is useful:
parking garage so if someone trying to break into your garage to get to your car, you can use these sensors to set off an alarm ( silent one is preferable)
My elevator: So i can use it to sense what floor my car is on
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