RE: [CAD_CAM_EDM_DRO] Re: HP printer encoders

Why not just "study" how the encoder is connected in the original hardware?
This can tell you much.

Alan KM6VV

>
> I've stripped the bits out of many printers and have always wondered
> about the HP encoders, it might be possible to work out which is the
> light source by using the diode checker function of a multimeter, of
> course you may get similar readings on other pins but you might strike
> it lucky. Then tentatively apply voltage while measuring current,
> observe the LED with a digital camera as these pick up IR which it may
> well be.
>
> After that, I guess you try what seems logical and compare the pin
> layout to anything else you find. Considering the resolution of some
> of these printers if you can hack the encoders they would be quite a
> cheap solution as I'm always seeing HPs in dumpsters/skips.
>
> Cheers,
>
> Graham