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PICList Thread
'driving bargraph LED with PIC16C54A'
1998\10\22@223007 by mutlu dagdelen

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First of all, greetings to all the subscribers as a new one on this
list.

I am new in the subject "PIC".
I need help for a term project based on PIC16C54A. The proposal of the
project is that,
i have to drive two bargraph LEDs with 32 levels, according to output
data packages, consisting of
address, data, max val., min val.,CRC
each of 1 bytes respectively.
the data byte part of the package corresponds to the level to be
displayed on one 32-level bargraph LED.
max and min values correspond to two seperate levels in the second
bargraph LED and these levels should flash when min or max is exceeded.

I would like to hear from those who could recommend some useful online
documentation that i would need and should have, as soon as possible.
Thanks a lot.

1998\10\23@003609 by James Cameron

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mutlu dagdelen wrote:
> I would like to hear from those who could recommend some useful online
> documentation that i would need and should have, as soon as possible.

Obtain the PIC16C54A data sheet from http://www.microchip.com/
Obtain a PDF viewer if you don't have one.

Data on the LEDs would be useful.

If you want books on programming PICs, others have pointers.

--
James Cameron                                    (spam_OUTcameronTakeThisOuTspamstl.dec.com)
Digital Equipment Corporation (Australia) Pty. Ltd. A.C.N. 000 446 800

1998\10\23@083642 by mutlu dagdelen

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James Cameron wrote:
>
> mutlu dagdelen wrote:
> > I would like to hear from those who could recommend some useful online
> > documentation that i would need and should have, as soon as possible.
>
> Obtain the PIC16C54A data sheet from http://www.microchip.com/
> Obtain a PDF viewer if you don't have one.

i have that one, it helped me grasp the pin layouts and instruction set
but what i need is something dependent on my project, something more
basic.

Thanks for your help.

1998\10\23@115236 by andre

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Mutlu,

I have done bar graph with 8 LED's based on 16C71 mono
I can easily modify it to stereo 2 channels multiplexed method
but if you want to make it 32 LED's on each channel then you need to add
same external IC's and modify the code for that. Let me ask you this
why did you pick 54 if you are going to use it in analog environment. you
can
still be able to use digital input as analog input by measuring capacitor's

discharge time but easy way to go is 71 or 7x.

Andre



mutlu dagdelen wrote:

{Quote hidden}

1998\10\24@011813 by Russell McMahon

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A useful chop for driving discrete LEDs or 7 segment displays are the
National MM545x series IC's. These are an old design and 40 pin dip
package but if you can stand this you get up to 35 LED segments
driven, 2 lines to control them, easy interface (much simpler than eg
IIC) and LED current control so no segment resistors needed and they
look after segment control so you don't need to multiplex with the
PIC. They are static for up to 35 segments so EMI is minimised. With
little effort you can drive more segments if you multiplex the data
from the PIC. The MM5453 drives LCD segments (about 32 as I recall)
and has inbuilt backplane oscillator. I am using this IC (5451) using
a PIC and PICBASIC(!) - its really easy to drive.



{Original Message removed}

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