Re: [CAD_CAM_EDM_DRO] Quadrature Decoder - I asked for the wrong thing

onecooltoolfool wrote:

> I was in the middle of building Mariss' quadrature decoder with the
> 4077 chip when I realized that this won't do what I want.
> I really need to take the quadrature signals from the encoder and
> send them to the PC as jog signals from the keyboard.
> If I did what I wanted to initially, the controller would loose track
> of the machine coordinate system since I would be sending step/dir
> signals without the controller's knowledge.

Right, I was wondering if this was what you really wanted to do.

> Can anyone point to the "way" to emulate keystrokes from quadrature
> signals? I plan on having a switch that will enable/disable the
> keyboard in favor of the pulse generator during jogging. This way
> the control stays "in control"

If you can get "count up" and "count down" signals from the circuit,
then you want to make one key contact for each count pulse, on the
right key. Attaching reed relays across the key switches of the appropriate
keys will mostly do it. The computer may miss some pulses, however.
Another way is to use one of those keyswitch array controllers that
simulate a keyboard. There was even one that was specifically designed to
decode hand encoders and send the coordinates to the PC.

Jon