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Topic: can TSL235R be used to estimate distance? (Read 32 times) previous topic - next topic


Hi folks, I'm absolutely new to the forum and Arduino world would really appreciate if you can help and teach me sth :)
I was reading about this sensor here:


It says It out puts a square wave proportional to the light intensity. So if I have a laser emitter (1mW) am I able to use inverse-square law to estimate the distance of an object with it?
I can clearly see the leaser beam gets larger in the far field distance and did a bit study it seems real world lasers have "Laser irradiance"(not sure but I guess and I don't know the model of my laser but it is 1mW red laser AFAIK).

laser inverse square law

Could you please teach me a bit about why it is/is not possible?

Thank you so much :)


I can understand your idea.
Varying ambient light will be a problem.  The laser beem may be too bright when close.  I think you will find this "not plactical", but give it a shot @$3

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