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Rotary Shaft coder design

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baby_1

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hello dears
i want to design a RPM meter with avr and rotary shaft coder
i have some questions;
1-what is the best rotary shaft coder(with high accurate) for 4000 RPM?
2-how can we find the rpm with that?
 

chuckey

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Accuracy is not a problem. What could be a problem is what sort of environment it has to cope with. the easiest way is just to put a white segment on a black shaft or disc. Shine a LED on this disc and use a photoelectric cell/photodiode to get a higher light reflection from the white bit. Or drill a hole through the disc and shine the light through this. Amplify the output from the PE cell/photodiode and turn it into a square pulse wave form. Now you want to measure the frequency of this waveform. How you do this is dependent on how precise you want your readings to be, i.e. 4000RPM +-1% you can analogue methods and display the output on a moving coil meter, higher precision then this and you must use a digital counter whereby you could read the RPM to 1 part in 10,000,000.
Frank
 

baby_1

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i have a question
you assume that i create a rotary speed meter with photocoupling.if i put it on shaft it does have a same speed with when i put it on the round (such as as fan)?
 

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