Proximity Sensor
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A light barrier requires a lamp (or a white LED) and a phototransistor. Would it be possible to combine both in a single element?
The answer is the proximity sensor, which combines an infrared LED with an infrared phototransistor. |
Video
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The 1st attempt didn't work, because direct sunlight blurred the sensor.
So I added a protection and following attempts were all successful. Even direct spotlight didn't alter the sensor. |
Conclusion
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Provided some protection from direct spotlight or sunlight, the sensor is capable.
Combining multiple sensors, eg. 4 of them, could provide a highly accurate and sophisticated trace reader. Proximity sensor key benefits are:
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