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'[PIC:] My First Project'
2004\04\13@163602 by Matt Marsh

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Reposting with subject tag... sorry guys :(

Hi guys,

I've just recently managed to get my first PIC project up and
running, yay! It's nothing too complex, just a bunch of LEDs (19
of them) arranged in a star formation (1 in the center and then 3
going out to each of 6 points of the star). A single push button
allows the user to cycle through four different sequence
patterns.

It seems to work ok, but no doubt there are plenty of
improvements I could make both to the hardware design and to the
code. If anyone would like to take a look at the code and/or
schematic I'd be more than grateful to receive any feedback...
I've put them up at:

http://www.mattmarsh.net/tmp/pic/ledstar.asm
http://www.mattmarsh.net/tmp/pic/led-star.png

I've had great fun playing around with electronics and getting
this thing up and running... now onto project number two!

Matt

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2004\04\13@234842 by Robert L Cochran

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Hi, what software did you draw the diagram with? I'd like to try the
same software myself. You did a nice job of drawing the actual diagram
and I'd like to try doing circuit diagrams myself.

Some suggestions about rendering and printing the diagram. Your diagram
is hard to read, at least on Internet Explorer. It does render a lot
better on Mozilla 1.7b on the Fedora Core 2 Test 2 beta. Also it is hard
to print, even in landscape mode on 8.5X11 paper: the right edge
including the title block truncates off the page and text doesn't show
up clearly.

But don't take these comments wrong, your diagram is very nice, and I'm
impressed with this "first effort" project as compared to my own. (Do
you have a photograph of your finished project?)

Thanks

Bob Cochran

Matt Marsh wrote:

{Quote hidden}

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2004\04\14@015900 by Matt Marsh

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Hi,

On Wednesday 14 April 2004 04:47, Robert L Cochran wrote:
> Hi, what software did you draw the diagram with? I'd like to try
> the same software myself. You did a nice job of drawing the
> actual diagram and I'd like to try doing circuit diagrams myself.

I used "Eagle", which I believe is fairly well used by people on
here. It's free for hobby use (with some limitations on the
circuit, number of layers etc) and seems rather nice for my
purposes at least. It runs on Linux too which is great for me. You
can download it at: http://www.cadsoft.de/

> Some suggestions about rendering and printing the diagram. Your
> diagram is hard to read, at least on Internet Explorer. It does
> render a lot better on Mozilla 1.7b on the Fedora Core 2 Test 2
> beta. Also it is hard to print, even in landscape mode on 8.5X11
> paper: the right edge including the title block truncates off the
> page and text doesn't show up clearly.

I guess that this is mainly due to the size that I exported the
image to when I created it as a .png file. If I print from within
Eagle itself, it comes out just fine, fitting nicely on one page.
When exporting to .png you have to specify what dpi you want to use
to control the size, I should have perhaps picked something a
little lower so sorry about that.

> But don't take these comments wrong, your diagram is very nice,
> and I'm impressed with this "first effort" project as compared to
> my own. (Do you have a photograph of your finished project?)

I have a photograph of the almost-finished project bread-boarded up,
with everything except for the push-button linked in. Take a look
at: http://www.mattmarsh.net/tmp/pic/picleds.jpg

Thanks,
Matt

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2004\04\14@020521 by Matt Marsh

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> Some suggestions about rendering and printing the diagram. Your
> diagram is hard to read, at least on Internet Explorer. It does
> render a lot better on Mozilla 1.7b on the Fedora Core 2 Test 2
> beta. Also it is hard to print, even in landscape mode on 8.5X11
> paper: the right edge including the title block truncates off the
> page and text doesn't show up clearly.

Just a thought about it not rendering properly on some browsers...
is this because the browser is scaling it down to fit the width of
the browser window? Some browsers do this. Sometimes if you hover
your mouse over the image, an icon will appear in the bottom right
of the image allowing you to expand the image to full size - that
might help the on screen rendering. Failing that, downloading the
image and viewing in an image viewer should also work. Sorry for
the excessive size of the image!

Matt

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2004\04\14@030619 by Bob Barr

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On Wed, 14 Apr 2004 06:59:06 +0100, Matt Marsh wrote:

>I guess that this is mainly due to the size that I exported the
>image to when I created it as a .png file. If I print from within
>Eagle itself, it comes out just fine, fitting nicely on one page.
>When exporting to .png you have to specify what dpi you want to use
>to control the size, I should have perhaps picked something a
>little lower so sorry about that.


One way to create a file for your schematic is to print to a file
using a Postscript printer driver. You don't need to install a
Postscript printer, just the driver.

You can then use this website:

http://www.ps2pdf.com

to convert it into a PDF file.


Regards, Bob

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2004\04\14@031656 by David Duffy

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Bob Barr wrote:

{Quote hidden}

The pdf995 driver http://www.pdf995.com/  is free as long as you don't
mind the nag screen. I bought the licence (~ $20 IIRC) to stop it though.
You just print straight to pdf - can't get any easier than that! :-)
David...

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2004\04\14@033359 by Jan-Erik Soderholm

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Matt Marsh wrote :

> It seems to work ok, but no doubt there are plenty of
> improvements I could make both to the hardware design...

One thing you could think about, would be to use a more
modern and easy to use PIC then your current 16F84A.

Perhaps for "Your Second Project" :-)

Have you seen : http://www.voti.nl/swp/index.html ?

Best Regards,
Jan-Erik.

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2004\04\14@033812 by Matt Marsh

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> On Wed, 14 Apr 2004 06:59:06 +0100, Matt Marsh wrote:
>
>>I guess that this is mainly due to the size that I exported the
>>image to when I created it as a .png file. If I print from within Eagle
>>itself, it comes out just fine, fitting nicely on one page. When
>>exporting to .png you have to specify what dpi you want to use to
>>control the size, I should have perhaps picked something a
>>little lower so sorry about that.
>
>
> One way to create a file for your schematic is to print to a file
> using a Postscript printer driver. You don't need to install a
> Postscript printer, just the driver.
>
> You can then use this website:
>
> http://www.ps2pdf.com
>
> to convert it into a PDF file.

You're right, a PDF would have been much better, and would have
been easy enough to do from Linux anyway. I did look to see if
Eagle supported exporting directly to PDF which would have been
nice, but yeah could have gone via postscript instead. I shall
do that next time.

Thanks,
Matt

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2004\04\14@035301 by Matt Marsh

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Hi,

>> It seems to work ok, but no doubt there are plenty of
>> improvements I could make both to the hardware design...
>
> One thing you could think about, would be to use a more
> modern and easy to use PIC then your current 16F84A.
>
> Perhaps for "Your Second Project" :-)
>
> Have you seen : http://www.voti.nl/swp/index.html ?

Yeah, read and absorbed :-) And yes, shall indeed be
switching to some non-obsolete chips for my next
project :-)

Thanks,
Matt

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2004\04\14@041211 by Rob Hamerling

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>>Perhaps for "Your Second Project" :-)
>>
>>Have you seen : http://www.voti.nl/swp/index.html ?
>

Matt Marsh wrote:
> Yeah, read and absorbed :-) And yes, shall indeed be
> switching to some non-obsolete chips for my next
> project :-)

And even the 16F628 is not in the MicroChip Product Selector Guide (1st
half 2004) anymore...  16F648A and 16F88 seem pretty attractive.

Regards Rob.


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2004\04\14@052734 by Jake Anderson

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take a look at cute pdf printer
installs itself as a printer you pick it hit print and out it comes
freeware

{Original Message removed}

2004\04\14@101842 by Matt Marsh

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> Hi,
>
> On Wednesday 14 April 2004 04:47, Robert L Cochran wrote:
>> Hi, what software did you draw the diagram with? I'd like to try the
>> same software myself. You did a nice job of drawing the
>> actual diagram and I'd like to try doing circuit diagrams myself.
>
> I used "Eagle", which I believe is fairly well used by people on
> here. It's free for hobby use (with some limitations on the
> circuit, number of layers etc) and seems rather nice for my
> purposes at least. It runs on Linux too which is great for me. You  can
> download it at: http://www.cadsoft.de/

One thing I forgot to mention - if you do decide to give
Eagle a try, I'd recommend downloading the tutorial
document and working through it. It wont take long and
it really got me up to speed on drawing the schematic very
quickly. Now I need to go on to do the pcb design part!

Matt

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2004\04\14@220754 by Robert L Cochran

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Matt,

What do you think of the Dia drawing application on Fedora Core 2 Best
(Test 2)? It seems to have some circuit diagramming capability.

Bob


Matt Marsh wrote:

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2004\04\15@034714 by Matt Marsh

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Hi Bob,

> What do you think of the Dia drawing application on Fedora Core 2 Best
> (Test 2)? It seems to have some circuit diagramming capability.

I haven't really played with "Dia" much. I've just had a look
at their website ( http://www.lysator.liu.se/~alla/dia/ ) and
as I understand it, Dia is a diagramming tool which happens to
have some libraries with electronic components etc.

I'm sure that you could create some ok diagrams with it, but
I suspect that it will be far inferior compared to Eagle which
is a dedicated electronics schematic and pcb layout tool. For
example, I'm presuming that Dia will just have a fairly limited
number of electronic components eg. diode, transister, resistor,
ic, capacitor, etc. where as Eagle has a vast library of
components that you can choose from where you can pick an
individual ic, eg. pic16f84a or whatever, and there will be a
diagram of it with labeled pins etc for you to connect nets to
and has all manner of labeling options for naming components,
giving them values and having it all be displayed correctly etc.
Naturally Eagle will also then let you take your schematic and
use that as a basis for a pcb layout though that's not something
I've used it for.

I'm sure that you could use Dia for creating some nice enough
diagrams of basic circuits, but I'm sure you'd find Eagle to
be far superior. Is there any particular reason you'd rather
use Dia than Eagle?

If you do create some circuit diagrams in Dia, post them up,
I'd be interested to see what results are achievable.

Matt


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