sansa e200 scroll wheel and tact switches

[grossaffe]

Anyone have any idea how the scroll-wheel works on the sandisk sansa e200? I'm trying to replace the scroll wheel with tacts but I don't understand how the thing works. here's the guts of the wheel:
http://www.joustin.com/sansa/images/0010.jpg

I don't understand how it differentiates a left and right turn and how I'd do that with tacts.

[jjhammerstein]

this is totally out of my ass, but I think it might tell direction and speed using electrical fields. That would explain the evenly spaced plates.

I don't think you can recreate that very easily.

[tom61]

What's the disc side look like?

My guess is that it makes connection between two of the connectors you see, and since there are three or four sets, it can tell which direction it is being spun by keeping track of the order of connections.

[grossaffe]

Well I finally got around to looking this over again and I've figured it out:



connect the cyan colored area to the red area and it will scroll once counter-clockwise. connect the cyan to the Yellow and it will scroll once clockwise.

that's all there is to it. place a tact between cyan and each of those colors and you've got yourself buttons for the scroll.

[palmertech]

Yo, I helped too.

Glad it works, hope you finish your project.

[grossaffe]

Yo, I helped too.

Glad it works, hope you finish your project.

I'm sorry


yeah, palmer wouldn't let me go without making me play with it with wires.