The reed relay would not require any other components, no resistors, no
transistors, nothing but the relay from +5 to a PIC pin (the snubber
diode is built into the relay I mentioned (Digi-Key #HE101-ND)).  It
gives you a nice isolated mechanical switch for $2.70.  That is hard to
beat, but if you look around you might find a cheaper relay.

Sherpa Doug

> -----Original Message-----
> From: Nick Veys [mailto:nick@VEYS.COM]
> Sent: Thursday, August 02, 2001 4:24 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: Solid state relay difficulty
>
>
> I think everyone is missing my point... I was hesistant to say I was
> connecting +5 to Gnd because then I would get the "use a transistor"
> message.  And a real relay is great, but I don't like the
> extra hardware
> involved, I'm looking for something simple, all I'm doing is shorting
> leads!
>
> I would think there would be some kind of solid state relay
> that can do
> this but apparently not?
>
> nick@veys.com | www.veys.com/nick
>
> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Roman Black
> > Sent: Thursday, August 02, 2001 2:19 PM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: Re: [EE]: Solid state relay difficulty
> >
> >
> > Mike Mansheim wrote:
> > >
> > > > Have you considered a relay? A "real" relay that
> > > > is! :o) Simple to drive with your PIC and should
> > > > work your AC fan load ok since you say it is low
> > > > power.
> > >
> > > Last time I went looking for a relay to run with a pic,
> > > I ended up using a solid state relay because the
> > > mechanical relays needed more drive current than the
> > > pic could do directly.  Of course, I limited my selection
> > > to whatever was listed in Digikey.
> > > So, does a solid state relay count as "real"?
> >
> > No. :o)
> > Try using a real relay with the coil driven by
> > a cheap 10 cent transistor like a BC337 or equiv,
> > and a diode across the relay coil, this can give
> > advantages over a solid state relay because of
> > the total isolation of the relay contacts from
> > the coil and PIC.
> >
> > Solid state relays are fine in many cases, but
> > "real" relays have their place, and are good
> > safe hardware for newbies.
> > -Roman
> >
> > --
> > 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
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>
>
>

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