Electronics > Microcontrollers

Quadrature Decoder - For Reference

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ehughes:
Hello:

I found this .pdf and posting it here for future archival and reference.    The approach is quite simple and easily implement in an MCU or FPGA with just a few lines of code.   I have tested it personally (using a simple shift register and LUTs) and it is quite robust.   I also have tested with a high speed optical encoder.

All credit goes to the author.

Enjoy

http://www.mkesc.co.uk/ise.pdf

chris_leyson:
Found the same method used here: https://www.circuitsathome.com/mcu/reading-rotary-encoder-on-arduino/. I used a PIC and interrupt on change and found the method to be very robust.

FrankBuss:
I didn't know the paper, but the concept is obvious, I implemented it some years ago exactly like described, with 4 bits and a table:

http://www.instructables.com/id/Using-a-Quadrature-Encoder-with-an-ATtiny-2313-and/

See step 3 for details of the microcontroller program.

MarkF:
This pdf shows the technique I use. No lookup table required.

Benta:
In my opinion, overengineered.

Using one of the quadrature input signals as interrupt/clock, simply sampling the other input at this point will give you direction information.
The first input will give you relative position and speed.

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