Need helt finding/making a high res. encoder
Need helt finding/making a high res. encoder Posted on: 13.07.2012 by Santiago Brasier Hi!I need to find a high resolution encoder to try some stuff out for my project. The problem I have is the ones I find are either to expensive or to tall to fit in my case. Been believeing about making my own with photointerruptors and a code disc however it would still be hard to get the resolution I'm after. I would like to achieve at least 1000+ klicks per revolution and if possible double that. I remember that extraclassig used the photointerruptors from an old exponent a while back and made his own code disc. Does anyone know how that turned out? Or what resolution he ended up with. I'm a little stuck on this one, so any advice is greatly appreciated. Been believeing about a multi level code disc, perhaps even one with absolute position to help avoiding bad readings. Let me know what you believe. Could this work or is it a silly idea? Cheers //Joel | |
| Santiago Brasier 13.07.2012 | Hi! I need to find a high resolution encoder to try some stuff out for my project. The problem I have is the ones I find are either to expensive or to tall to fit in my case. Been believeing about making my own with photointerruptors and a code disc however it would still be hard to get the resolution I'm after. I would like to achieve at least 1000+ klicks per revolution and if possible double that. I remember that extraclassig used the photointerruptors from an old exponent a while back and made his own code disc. Does anyone know how that turned out? Or what resolution he ended up with. I'm a little stuck on this one, so any advice is greatly appreciated. Been believeing about a multi level code disc, perhaps even one with absolute position to help avoiding bad readings. Let me know what you believe. Could this work or is it a silly idea? Cheers //Joel |
| Santiago Brasier 13.07.2012 | Great stuff! Thanks again for sharing! If I manage to make any progress I'll post pictures for sure. This encoder project is still a couple of months away though. Going to finnish my MIDI mixer first. Cheers //Joel |
| Diogo Dj Dragão 13.07.2012 | Look into gray code encoders. http://code.google.com/p/wheel-encoder-generator/ This app gives you several variables to play with, including resolution and absolute / relative. The great thing about using gray code is that you aren't limited by how fine you can make your photointerrupters. If you're creating a platter with injection molding, rapid prototyping gear , etc, you're going to be hard pressed to get "teeth" finer than 2-3mm. On a small platter this can be limiting. Yes, you can use multiple sensors and quadrature, but this setup can also be fiddly to DIY. Love this stuff - let us know how you progress! |
| Santiago Brasier 13.07.2012 | That should work. Would be hard to get it properly calibrated though! Will try it once I get to that stage of the project. If it's to hard, I might get a code disc laser cut with a slight offset between each layer to get the same effect with the sensors mounted on a straight line from the center and outwards. Thanks for your input! This could prove very useful! Cheers |
| Allene Manitta 13.07.2012 | you can easily increase the resolution of an optical encoder by adding more sensors to the circle: i'll explain it in an easy example. say you have a resolution of 2 klicks by now with 2 sensors (you need 2 to get the direction of the turn). if you add 2 sensors 90 degrees apart from the existing ones you can get 2 klicks per turn. this also should work for higher resolutions than 2 klicks be aware that the placement of the sensors has to be extremely accurate if you want some seroius output! |
<< Back to Reviews of DJ equipment Reply