I haven't used the 16HV540 personally but from what you have described I would
be more concerned about your 150 feet of cable acting as a receiving antenna
for external noise.

If your system does generate noise then presumably it would only occur when a
button
changes state, if this happens then slow the edges down with a C.

Nigel

On Wednesday, January 09, 2002 10:28 AM, Rod Phillips
[SMTP:rphillip@NETINS.NET] wrote:
> Hello to all,
>
> I have a question for the experts.  I want to use a 16HV540 to read manual
> switch positions with about 150 feet of cable between the switches and the
> pic.  The power through the switches is a clean 12vdc and will be going to
> the hv inputs on port_b.  My question is, is it possible that the pic could
> generate noise on the long cable that would interfere with other systems?  I
> may need to use a port_b pin or two for output but the outputs won't be on
> this cable.  Thanks in advance for your help.
>
>                      Rod
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.