1 How to use linear encoders with Arduino. hardware, code, and demo.
Recommended as a clear explanation of how salvaged printer optical encoder strips produce quadrature signals you can read for position and direction.
Topic
optical encoders
2 videos. Ranked by independent recommendations, not by views.
2 Rotary encoder - sensor arrangement
Recommended as a clear account of how rotary encoders work, with enough detail to build one yourself; the ideas carry over to linear encoders and other boards.
