The shaft encoder is a photo interrupter with a disc - 100 steps per revolution.
I made the disc myself so I can adjust the number of steps quite easily.
I did a sanity check on the shaft encoder but counting the number of steps per second using a simple COUNT routine and displaying the result on the LCD. I then compared the result with a non-contact hand-held digital tacho. The two results were near identical - I was very happy with the accuracy of my system.

I have just finished assembling the PCB (see attached) and hope to do some testing on it tonight.


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Cheers
Barry