Re: home switches

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Peter Homann"
<peter.homann@a...> wrote:

> Hi,
>
> The technique I use on my TurboTaig board is to combine the home switch
> input with the 'home' (phase 0) signal from the stepper driver. I

checked

> the datasheet for the 5804 and it doesn't have this output. The 3977

or the

> ST L297 does though. This output on these components is there to solve
> exactly your problem.
>

Peter,

thanks. I suppose I could make my own phase0 signal with some TTL
logic based on the outputs from the 5804? If I recall correctly they
are grounded when the given coil is activated. I'm not sure whan they
do in the inactive state, float to the supply voltage? I'm a bit
rusty on the electronics since I finished the board months ago and
have been mainly working on the mechanics.

Is the basic idea here that the home signal = actual position in steps
modulo 8? that's fine if your switch error is usually within an 8
step range but what if it is more? get a precision switch I guess.



dave