Originally Posted by Al_The_Man  Did you happen to test the 50mm 500 line? How successful was it?
The usual problem is the line density is too high for a conventional photo cell arrangement to read.
For example the line spacing on 500 line, 50mm disc will be around .0065" or .165mm.
This is going to make it almost impossible for common photocell transmitter/receiver to distinguish between the lines.
Al. |
It is a long time ago.
I used CNY37 led barriers.
And i got a sinus like signal floating somewhere between 0 and 5 volt.
A comparator made it into a square wave.
There was instability in the signal, never found out if it mattered.
Then i stopped experimenting, other priorities :-)
It never was used to actually control a servo motor.
Still interesting puzzle to make a encoder, my hobby hart itches again, but lots of other things to do. :-)
Could a laser from a old cd player be used ?
It has a much narrower beam, i think.
Vroemm.