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how to recognize that the fist is open or not?

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hamidkavianathar

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hi guys
I want to find out that my fist is open or not. is it possible to do it with PIR sensor? if not, do you know another solution?
thank you.
 

thanks for your attention. using a flex sensor is very good option but it's a little expensive.
is there any cheaper sensor?
 

Suppose you put a magnet on fingertips, and a reed switch in the palm? Closing the fist brings one close to the other.

You want a reed switch that isn't made from a glass bulb. It may require some searching.
 
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