Re: Pixie error connection

Mark,

Do you still think the resistor is important and that 10K would be
fine? Also, I think the original idea of the darlington array IC was
that the resistors were already incorporated for 5v TTL level logic.
The ULN2803 has a 2.7K resistor.

Thanks,
Keith

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Mark Vaughan" <mark@...> wrote:
>
> Hi Graham
>
> It's for his Estop to trigger it upon a servo position error
>
> Regs Mark
>
>
>
> Dr. Mark Vaughan Ph'D. B.Eng. M0VAU
>
> Managing Director
>
> Vaughan Industries Ltd, reg in UK no 2561068
>
> Water Care Technology Ltd, reg in UK no 4129351
>
> Addr Unit3, Sydney House, Blackwater, Truro, Cornwall, TR4 8HH, UK.
> Phone/Fax 44 1872 561288
>
> RSGB DRM111(Cornwall)
>
> _____
>
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Graham Stabler
> Sent: 16 July 2007 10:43
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Pixie error connection
>
>
>
> --- In CAD_CAM_EDM_ <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> DRO@yahoogroups.com, "Graham Stabler" <grezmos@>
> wrote:
> >
> > --- In CAD_CAM_EDM_ <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> DRO@yahoogroups.com, "toolspindoctor"
> > <clarkfamily5@> wrote:
> > >
> > > I gave it a try and connected +5v to the + of the relay and Pixie
> > > error to the - of the relay and it does not trip the relay so I
assume
> > > it is still going to 0 volts. Guess I'll need to go the transistor
> > > route...
> > > Thanks
> > > Keith
> >
> > Tripping the relay requires error to go to 0v, it should only trip if
> > there is an error.
> >
> > Graham
> >
>
> Ah after looking at Tom's post I think I get it, you want the Relay to
> be normally on and off if there is an error, I didn't know that part
> mattered thinking you would just change the software to suit.
>
> Graham
>
>
>
>
>
> [Non-text portions of this message have been removed]
>