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'[PIC:] Which pic to use? - Calculator Project'
2004\04\05@001015 by Arron McLaughlin

picon face
Hi,
I'm making a really powerful scientific calculator and I need to know which
kind of PIC to use.
I posted a message a little while ago that may have been a bit vague, but I
now know exactly what I'm looking for!

The program I'm writing is fairly big (a whole equation parser, lots of
other stuff) - maybe about 15 pages long and is in (mostly) C.
The pic needs I2C for serial eeprom i/o, enough i/o for a small lcd and a
large matrix keypad (8x5) which i think should'nt be an issue just fitting
my code
in.
It also needs to be under $10.
Will my program fit on a Pic16xxx?

[edited : i got an error message from the original post, please ignore this
one if the older version got through ok (im on digest mode :P ) ]

Thanks,
Arron

_________________________________________________________________
There s never been a better time to get Xtra JetStream @
http://xtra.co.nz/jetstream

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2004\04\05@003054 by D. Jay Newman

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face
> The program I'm writing is fairly big (a whole equation parser, lots of
> other stuff) - maybe about 15 pages long and is in (mostly) C.
> The pic needs I2C for serial eeprom i/o, enough i/o for a small lcd and a
> large matrix keypad (8x5) which i think should'nt be an issue just fitting
> my code
> in.
> It also needs to be under $10.
> Will my program fit on a Pic16xxx?

I believe that the 18F452 is under $10.00 ($9.32 in quantities of 1 at
Digikey).
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2004\04\05@121602 by Spehro Pefhany

picon face
At 04:01 AM 4/5/2004 +0000, you wrote:
>Hi,
>I'm making a really powerful scientific calculator and I need to know which
>kind of PIC to use.
>I posted a message a little while ago that may have been a bit vague, but I
>now know exactly what I'm looking for!
>
>The program I'm writing is fairly big (a whole equation parser, lots of
>other stuff) - maybe about 15 pages long and is in (mostly) C.
>The pic needs I2C for serial eeprom i/o, enough i/o for a small lcd and a
>large matrix keypad (8x5) which i think should'nt be an issue just fitting
>my code
>in.
>It also needs to be under $10.
>Will my program fit on a Pic16xxx?

How about you compile the C code you have and see how much assembly code
is emitted? You might find a $15 or $18 (qty 1) chip that will take all your
code more valuable than a $9 one that will only take half of it, if it comes
down to that.

It makes a LOT more sense than us trying to guess how much assembly will
be generated by 15 pages of unknown C code..

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
.....speffKILLspamspam.....interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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2004\04\05@122636 by Jan-Erik Soderholm

face picon face
> Hi,
> I'm making a really powerful scientific calculator and I
> need to know which kind of PIC to use.

I must be missing something here...

I can go downtown and by me a "powerful scientific
calculator" for *less* then a blank high-range PIC18...

What are you doing ?
And what are the TI's, Casio's, whatever missing ?

Or is this simply just joke ?

Jan-Erik.

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2004\04\05@124712 by Ken Pergola

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face
Jan-Erik Soderholm wrote:

> I must be missing something here...
>
> I can go downtown and by me a "powerful scientific
> calculator" for *less* then a blank high-range PIC18...
>
> What are you doing ?
> And what are the TI's, Casio's, whatever missing ?
>
> Or is this simply just joke ?


Hi Jan-Erik,

My guess is that this person is doing this for the educational experience,
and my hat is off to him.
If you look at it from the angle of how much this person will learn by going
through this exercise, I think it will make better sense.

Best regards,

Ken Pergola

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2004\04\06@104126 by llile

flavicon
face
>Or is this simply just joke ?


Not at all, Jan-Erik!  Most of my PIC projects fall into one of three
catagories:

1.  Stuff I could go out and buy for less money and no effort
2. Stuff someone else has already made that I am making for my company for
a "me-too" product
3. Actual innovative products that haven't been made before

90% of my work falls into the first two categories.  90% of my hobby
projects fall into the first category.  I would consider making a
scientific calculator to be a very interesting and useful project.  Often
I take on hobby projects just to keep my skills sharp, when design work
gets slow at work (I do a lot of testing for weeks on end).  These allow
me to keep sharp enough to rapidly develop a lab one-off when my lab need
some gizmo that can't be bought off the shelf for any money.

How many times have any of us made an LED blinky?  I can't count them -
that is often the first step in a prototype, it proves that the PIC is all
correctly hooked up, the timers are set right,  later it gives me a visual
heartbeat watchdog on the PIC's health, and sometimes in the middle of a
project when a PIC refuses to work at all  the whole thing grinds to a
halt and I go back to a BLinky to see if the basics are working right.  I
put a Blinky on my bicycle helmet to keep from getting killed in traffic,
which I could have gone out and bought for less money (mine is better
though) Yet the Blinky is considered the "merit badge" of PIC projects,
pretty good for a boy scout but not worth much otherwise.



-- Lawrence Lile
Senior Project Engineer
Toastmaster, Inc.
Division of Salton, Inc.
573-446-5661 voice
573-446-5676 fax




Jan-Erik Soderholm <KILLspamjan-erik.soderholmKILLspamspamTELIA.COM>
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04/05/2004 11:27 AM
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> Hi,
> I'm making a really powerful scientific calculator and I
> need to know which kind of PIC to use.

I must be missing something here...

I can go downtown and by me a "powerful scientific
calculator" for *less* then a blank high-range PIC18...

What are you doing ?
And what are the TI's, Casio's, whatever missing ?

Or is this simply just joke ?

Jan-Erik.

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2004\04\06@122859 by David VanHorn

flavicon
face
>
>How many times have any of us made an LED blinky?  I can't count them -
>that is often the first step in a prototype, it proves that the PIC is all
>correctly hooked up, the timers are set right,  later it gives me a visual
>heartbeat watchdog on the PIC's health, and sometimes in the middle of a
>project when a PIC refuses to work at all  the whole thing grinds to a
>halt and I go back to a BLinky to see if the basics are working right.  I
>put a Blinky on my bicycle helmet to keep from getting killed in traffic,
>which I could have gone out and bought for less money (mine is better
>though) Yet the Blinky is considered the "merit badge" of PIC projects,
>pretty good for a boy scout but not worth much otherwise.

http://shop.store.yahoo.com/sirennet/whelslimmver.html

Not bad, for a LED blinky.
I did a clone in the AVR, with some extra features like sending an SOS blink if you power up with the pattern button down.



Lots more here.
http://shop.store.yahoo.com/sirennet/grbomo.html

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