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Slot sensor - optocoupler GP1A57HRJ00F - SparkFun SEN-09299
Sensor with an infrared emitter on one side and a screen infrared detector on the other. By emitting a beam of infrared light, it can detect when an object passes between the posts, breaking the beam . The width of the slot is 10 mm. The supply voltage is from 4.5 V to 17 V.
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