Acceleration comparisons

[RPS69]

Originally Posted by MaxGunz

Distance from the magnet is not how to get linear angle from a Hall sensor! The Hall reads only on 1 axis. You align the axis dead center over the magnet center between N and S poles. When the magnet turns, the strength of the field along the Hall axis changes. That is what you measure.
Try the other way, you will need more than 1 magnet and the fields will affect each other, merge, and you won't get good results.

You wrong! believe me! just one sensor is enough.

Optical... a lot can be done using laser-printed transparency graphics you can get printed at most any office store.

Have you ever looked at how ball mice track motion? Or used a vernier?

I have read that working with the dimensions of a Young's double-slit can yield a high number of interference bands. Perhaps diffraction from a single slit can also be used.

Really, the number of ways is a study in itself.

There are many optical encoder devices available, and I have tried them. Magnetic is better.

This is a good topic on itself, meybe we start it into another thread, or we may end hijacking this one.