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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Hi. I have a vending machine which dispenses vending cups. I noticed sensors which look like LEDS on either side of the cup holder. How do these sensors work, as I would like to use them in a project later on.
More than likley one is an LED the other is a photo transistor or a photo diode.
If the detector can't see the light coming from the LED it knows there's something blocking the space between which it assumes is the cup. Pretty basic.
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