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The signal detection is not sensitive enough, please help us to see, thank you.

Hardware design
enero 14, 2021 by Emery 1178

The purpose is to allow the dust or small particles to pass between the infrared pairs of tubes, the dust_sense terminal can detect the level changes. The problem is that this is not sensitive enough. Can you help me see how to change it?

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Brennan Publicado en January 14, 2021

U6-B, you can use the op amp as a comparator, and the problem will be the problem. The rising slope is relatively slow (also called slew rate). Replace this place with a comparator, the effect is better

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Ronald Publicado en January 14, 2021

Personally, infrared photoelectric is not suitable for dust or small particle detection. Infrared light has a long wavelength, which is related to the relative size of dust particles and covers the light path. Optoelectronic devices are easily obscured by dust and reduce accuracy. , And even fail.

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Alec Publicado en January 14, 2021

This is dust sensor。
buy a sharp dust sensor like GP2Y1014  or GP2Y1026AF02,compare it. it is quite sensor


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