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Topic: Incremental rotary encoder knob? (Read 2 times) previous topic - next topic

cyberstudio

Ya...  :( I need to go back and study elementary math again...

but anyway, this is the cheapest product I can find so far... some capacitive rotary encoder...

http://www.amtencoder.com/Product/AMT103

jraskell

A 24 tick per rev encoder would give you 3600 ticks per rev with 150:1 gear reduction on the turntable, and that is certainly feasible so I'm not sure why you think you couldn't get enough gear reduction to use it.

Korman

A few other ideas:

If it's for a fairly large knob like a turntable, why not mount an linear encoder along the outer edge and measure the linear speed of the rim. If you want to be really cheap, use an optical mouse sensor.

Use some form of gears to speed up the movement of your rotary encoder. You for example use from a turn table the power train and mount a regular rotary encoder instead of the motor.

And if it's for scratching, an accelerometer might also give natural input values.

Korman



binooetomo

The cheapest way you can achieve is using encoder wheel.

First, go --> http://www.mindspring.com/~tom2000/Delphi/Codewheel.html
You can find a link to the basic knowledge of encoder wheel.

There is also a software that will generate a wheel patern for you to cut.

But for that resolution you want .. you'll need to go to the laser cut shop .. and they can not accept the bitmap format generated by the software above.

Here it come the help for that situation
Go --> http://www.thingiverse.com/thing:1527
It have a poscript file that you can edit with text editor , preview it in gimp, and bring to laser cut shop.


Now , the limit is your ability to align the optical parts.

Have a nice hack (errrgghh .. alignment)

Sincerely
-bino-

fkeel



If it's for a fairly large knob like a turntable, why not mount an linear encoder along the outer edge and measure the linear speed of the rim. If you want to be really cheap, use an optical mouse sensor.



Was gonna suggest that imho its probably the best way to go.

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