Searching \ for '[PIC]: Project Idea, anyone done it already?' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/microchip/devices.htm?key=pic
Search entire site for: 'Project Idea, anyone done it already?'.

Exact match. Not showing close matches.
PICList Thread
'[PIC]: Project Idea, anyone done it already?'
2000\10\16@171055 by Carl Ranson

flavicon
face
Hi all,

I've thought of what I think would be a good project for a pic. I would like
to have a 8 channel relay board that is controlled through a standard serial
interface.

ie. PC->Serial->Pic->8*Relay

It would also be nice to have the Pic able to report the status of each
relay back to the host.

Has anyone done a circuit like this already?

Thanks,

Carl Ranson

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




2000\10\16@174628 by Dale Botkin

flavicon
face
On Tue, 17 Oct 2000, Carl Ranson wrote:

> Hi all,
>
> I've thought of what I think would be a good project for a pic. I would like
> to have a 8 channel relay board that is controlled through a standard serial
> interface.
>
> ie. PC->Serial->Pic->8*Relay
>
> It would also be nice to have the Pic able to report the status of each
> relay back to the host.
>
> Has anyone done a circuit like this already?

I worked up the hardware design a few months ago for one for a friend.
He's got a Linux machine (modified I-Opener) in his car and wanted it to
be able to control doors, windows, etc.  I did write some code for it, but
it was for the BS2, so I'd want to rewrite it in C instead.  The hardware
is, of course, dead simple...  all you're doing is turning on relays.  The
details depend on how much current/voltage you plan to switch, which
determines (to some degree) how big the relays are, which determines
(again, to some degree) what the drive requirements are.

Dale
---
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
               -- Isaac Asimov

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




2000\10\16@182758 by Olin Lathrop

flavicon
face
> I've thought of what I think would be a good project for a pic. I would
like
> to have a 8 channel relay board that is controlled through a standard
serial
> interface.
>
> ie. PC->Serial->Pic->8*Relay
>
> It would also be nice to have the Pic able to report the status of each
> relay back to the host.
>
> Has anyone done a circuit like this already?

Yes, I have.  But before we get too far, is this a commercial project (in
other words a real budget) or a one-off hobby project?  (Sorry, but I've
gotten caught on this before, especially on this PIC list.  After spending
time with several emails back and forth sending descriptions, specs, and the
like, I finally discover that the other person is expecting code for free
and never had an intention to pay for anything).

Not quite a year ago we created a custom system for sequencing power to a
piece of industrial equipment that has lots of individual DC supplies and
other things that need to be separately switched.  We deliberately kept it
general so that it would be applicable in a variety of applications.  It has
switched AC outputs, digital outputs, digital inputs, and configurable
analog window detection inputs for sensing of DC power supply outputs.  It
can be controlled from a host via a serial line, but the sequence of
operations can also be programmed into the unit and saved in EEPROM.  The
unit also reports current status, operations, and failures back to the host.

Let me know if you want more detail.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, spam_OUTolinTakeThisOuTspamcognivis.com, http://www.cognivis.com

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




2000\10\16@183828 by Andy Howard

picon face
> From: "Carl Ranson" <.....Carl.RansonKILLspamspam@spam@TURING.CO.NZ>

> Hi all,
> I've thought of what I think would be a good project for a pic. I would
like
> to have a 8 channel relay board that is controlled through a standard
serial
> interface.
> ie. PC->Serial->Pic->8*Relay
> It would also be nice to have the Pic able to report the status of each
> relay back to the host.
> Has anyone done a circuit like this already?

There's a PICBASIC one on http://www.rentron.com/PIC16F84.HTM which might
give you a few ideas to get started.
From that one you could drive a high sensitivity relay directly or a
standard pcb one via a driver such as one of the ULN 2xxx chips







.

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




2000\10\16@184041 by Carl Ranson

flavicon
face
{Quote hidden}

No, strictly a personal hobby project. I'm a software developer by trade so
the code is the easy part as far as I'm concerned.

Surely someone can point me to freely available source for doing the comms
part? (or is that overly optomistic)

{Quote hidden}

Sounds pretty cool but more than I need.
Do you sell these? How much?

Thanks for the reply.
CR

{Quote hidden}

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




2000\10\17@085434 by Olin Lathrop

flavicon
face
> > Not quite a year ago we created a custom system for
> > sequencing power to a
> > piece of industrial equipment that has lots of individual DC
> > supplies and
> > other things that need to be separately switched.  We
> > deliberately kept it
> > general so that it would be applicable in a variety of
> > applications.  It has
> > switched AC outputs, digital outputs, digital inputs, and configurable
> > analog window detection inputs for sensing of DC power supply
> > outputs.  It
> > can be controlled from a host via a serial line, but the sequence of
> > operations can also be programmed into the unit and saved in
> > EEPROM.  The
> > unit also reports current status, operations, and failures
> > back to the host.
>
> Sounds pretty cool but more than I need.
> Do you sell these? How much?

Yes, we could sell these.  We don't have a standard price because I imagine
there would be customizations desired for different applications.  If
someone wanted a bunch of these exactly like we've already made them, the
price would probably be in the low K$.  This may seem like a lot, but this
particular configuration comes with one rack mounted box where all the
switching occurs, a separate "user panel" box which has the ON and OFF
buttons and status lights, a 50 foot cable between the two boxes, an RS-232
cable to the host computer, and a bunch of host computer software.  There
are also other features I didn't mention, like two gel cells for emergency
lighting, and circuitry and accompanying hardware to test and verify just
about everything this box can do.  For example, shorted or open relays can
be detected.  Of course lots of attention to safety, which includes UL, CSE,
220/110 volts, 50/60 Hz, etc.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, olinspamspam_OUTcognivis.com, http://www.cognivis.com

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
use @spam@listservKILLspamspammitvma.mit.edu?body=SET%20PICList%20DIGEST




More... (looser matching)
- Last day of these posts
- In 2000 , 2001 only
- Today
- New search...