Let's Make Robots!

Stepper motor as encoder

Uses current generated on coils in stepper to act as an encoder

Pretty simple circuit I found, you may have to play with the resistor values to get the output to logic level depending on your steppper.

It uses two voltage comparators to convert the output to a square wave form to be read by micros, it will output the rate and direction of rotation based on the sequence it spits out high values.

 

Try it out!

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hey, whatever became of this project?

did the encoder work out?

will be handy some day! whats the little arrow on the - lead of the top comparator?
I'd guess ground.
yup
Bipolars only by the way