In the other direction, the lead pulse will be reversed. There’s code to let an Arduino read the pulses. And here’s plenty of code that will read quadrature on an Arduino or other processors.

I needed a rotary encoder — I pulled a cheap one out of one of those “49 boards for Arduino” kits you see around. Not the finest encoder in the land, I’m sure, but it should do the job.

Relative rotary encoder The relative rotary encoder, also known as incremental encoder, is an applied optical encoding methodology. Generally, the rotary encoder utilizes a patterned spinning disc ...

10:02 am August 16, 2018 By Julian Horsey Makers, developers and Arduino enthusiasts searching for silent stepper drivers with high resolution encoders which are also Arduino compatible.

Motor rpm is found by measuring the time between pulses. Divide 60 by the product of the encoder PPR and the period of time between output pulses in seconds to determine rpm: rpm = 60/ (PPR t).

Quadrature encoder wisdom If you are a novice to rotary encoders for human-machine interface, there is a potential pit-fall. Otherwise called quadrature encoders, they deliver two-bit gray-scale ...

The quadrature encoder with acceleration would seem easiest, but it still needs coding. My bright (I claim…) idea is to use two potentiometers connected to two analogue arduino inputs (method below), ...

By Glen Young, Actel September 11, 2007 -- pldesignline.com Precisely tracking speed, acceleration, and position of a motor's rotor is an essential requirement for many motor control applications ...