RE: Electronics question

["Justin" <justin@xxxxxxx>]

Thank you John.

Justin.

> -----Original Message-----
> From: Dr John Tankard [mailto:john@xxxxxxx]
> Sent: 21 May 2002 11:28 AM
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Electronics question
>
>
> For a input this means that the device is sinking current (very small)
> through the resister. If you had not got the input connected to
anything
> ie via a switch then the board input sees 0v though the 4.7k (if that
> was not there the voltage would float). When you close your switch
with
> say 5v on the other side the board input would see 5v bacause the 4.7k
> would not be able to pull it down bing a high resistance
>
> John
>
> ----input pin-------board input
>
>
>                 4
>                 .
>                 7
>                 k
>
>
>                 ground/0v
>
>
>
>
> > -----Original Message-----
> > From: Justin [mailto:justin@xxxxxxx]
> > Sent: 21 May 2002 11:19
> > To: Ukha_D
> > Subject: [ukha_d] Electronics question
> >
> >
> > I am thinking of getting one of these:
> > http://www.controlanything.com/cgi-bin/miva?Merchant2/merchant
> > .mv+Screen=PRO
> > D&Store_Code=NCD&Product_Code=NCD205 as it looks like
quite a
> > nifty way of getting data into HomeSeer. The data sheet says
> > all inputs should be tied low with a 4.7K resistor. What does
> > that mean?
> >
> > Cheers,
> > Justin.