ajlelectronics
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Here is the matrix with least crosstalk susceptibility.
These probably came from "the cash" in Dundee, otherwise known as NCR.Those LDRs are still being sold atached to Chinese light sensor modules for the Arduino etc.
I think I can easily do them in that order as a sample macro I got basically just defines the Inputs for each position so I could make them suit my requirements.
Yes, not really suitable for trhis application but at least I know what they are now, never likely to use them thoughORP12 response times are very slow
That doesn't look very wide, you might be better off combining two sensors on the same wheel by dividing the perimeter of the wheel into 16 segments, offset the marks on second wheel by 22.5 degrees and fit them on the first wheel, then the second sensor can be placed at 22.5 (+45*n degrees) and reduce the hub down to just two wheels, or even only use 3 wheels as Daleyd says and fit them all on one big wheel divided into 24 with the sensors each 15 degrees out of phase?Just looking at the model I did when designing the turret and I think I can probably fit the reflective sensors inside the housing and make up a disc from black delrin with white inserts and fit that to the main sliding coupling. That would mean everything is enclosed and it is reading from the final stage of the drive so no broken belts or couplings would interfere with the readings. Pic below of the cutaway of where they should fit.
Best bit is it is only 4 cap screws and the whole housing/gearbox/motor etc comes off so access is easy
View attachment 163668
Won’t you only need 3 inputs to get 8 positions? Eg
000
001
010
011
100
101
110
111
Just finished doing a mock up, seems to be plenty of roomThat doesn't look very wide, you might be better off combining two sensors on the same wheel by dividing the perimeter of the wheel into 16 segments, offset the marks on second wheel by 22.5 degrees and fit them on the first wheel, then the second sensor can be placed at 22.5 (+45*n degrees) and reduce the hub down to just two wheels.
Oh I see, I was picturing the sensors looking at the edge of some wheels as on page one rather than the face, this way does make more sense.
Now I am just wondering if I could have a white disc with cutouts rather than a black disc with white inserts. It would mean the opposite state on the reflective switches but it would do the same job as long as the control knows whether they are meant to be true or false.
Wonder though if that would make it more prone to faults not being seen properly? will have to ponder over that one
You have never seen my painting, either way it would be very artistic, just one would be very abstractA black disc with white or silver paint. Unless you want it to be a work of art, rather than just functional?
Well I have just got into the same "dewy eyed" frame of mind, raked in the drawer and found the switch part of the mouse but not the wheel/disc part. I did however find a Barton CPU, a BIOS chip from and AN7 mobo which contained my backup OC settings and a nice Washita slip stone I had forgotten I had.Yeah more of a delta counter in spec but you could adapt in software easily enough to make it absolute. To be honest man I missed the absolute positioning requirement after I got dewy-eyed over the old tech