Quadrature encoders for motor control

[electricgeek]

How do i make a quadrature encoder? I want to make two motors rotate at the same speed by using quad encoders. And can i, without anything else, make a robot move on a circle track using only quad encoders?

 

[FvM]

If the motor moves only one direction, or you know it's direction and don't need to track the position across reversals, a single channel incremental encoder would be sufficient. Otherwise a code wheel and two opto-interrupters mounted with an offset of one quarter of the codewheel resolution make a quadrature encoder.

 

[Sudarsan_EDA]

PIC18F4431 family MCU's feature a MFM (Motion FeedBack Module) to monitor velocity and position activity for motors. This QEI peripheral supports 2 or 3 channels encoders, A, B & Index.

or If you are looking for independent QEI module this link may helpful.
https://groups.csail.mit.edu/drl/courses/cs54-2001s/pdf/hctl2000.pdf

 

[electricgeek]

My motor has to move in one direction only.

**broken link removed**

Will I be able to use this to achieve my task? Will it go on the back shaft of my motors?

What is the angle of throw? And how do i determine which one i need?

@Sudarsan_EDA: Does the PIC18f4520 have MFM?