Re: [CAD_CAM_EDM_DRO] XY joystick jogging

Hi Tom,

I didn't even draw up a schematic for it, it's that simple! I use the
+5 and ground from the DB15 connector to power the encoder, the ENC A
and ENC B wires out of the encoder go to the A and B switches for the
1st joystick.

Read the "port" for the joystick, return the lower four bits, which are
the four switches.

The two bits for the encoder are watched in a loop, and as the edges
change through their quadrature cycles, CW or CCW "steps" are
recognized.
On each CW or CCW "event", you do something (like issue step pulses)!

Alan KM6VV


Tom Eldredge wrote:

>
> Alan,
>
> How do you use the game port for a shaft encoder? Please give a little more
> detail. I can't picture this.
>
> Tom
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