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PICList Thread
'[PIC]: Building a Servo PIC16F628'
2001\08\09@142752 by Mike Kendall

   Being that I'm one of those 2,000plus readers I've paid attention to
this and previous mentions of the newer/more-enhanced PIC16F628.  I'm a
believer in the addages "If the spoke is broke fix it" and "if it's not
broken, don't fix it".  This saying meaning sometimes it's better to replace
the entire wheel than to fix the spoke, but if it's not broken in the first
place....  Anyways, I've been gearing up for quite some time on a project
that will use a digital frequency readout.  I've seen alot of existing
plans/code  for frequency counters with displays that use pre-scalers.  One,
in particular uses a $3 digikey prescaler chip (cant remember the chip right
now) and is claimed to work up to 2.4ghz.  I would not need to go anywhere
near that high as a counter for this project.  With this in mind, I wonder
what code exists as "freeware" to use as a counter with the newer PIC16F628
or if the older F84 code will work on these newer chips?  I'm guessing the
code won't because of the differences in the clock speed.  My display will
consist of 4 digit LiteOn  LED's that were origionally intended for clock
diplays as there is a colon in the middle of the display.  It can easily be
used as a simple 4digit LED just the same.  Reason for these LED's is that
I've got over 650 of them to use up. I'd rather not have to write code for
this project at my present level of PIC expertise.
Mike Kendall
----- Original Message -----
From: "Bob Ammerman" <.....RAMMERMANKILLspamspam@spam@PRODIGY.NET>
Sent: Thursday, August 09, 2001 6:01 PM
Subject: Re: [PIC]: Building a Servo

> Herbert,
> You are certainly welcome to use the F84 for your project (and it should
> work just fine). However, remember there are 2000+ others reading the
> PICLIST and it would be a disservice to them not to let them know the
> 'better' alternatives.
> The answer you receive today will be going into the archives where
{Quote hidden}

> > has decided on using a certain part? Why does it matter that I have
> decided
> > to use a part that might not be optimal but should work anyways? True
{Quote hidden}

> > wants to use something and you get dozens of messages asking why not
> > part and why not that part. Maybe I'm the only one annoyed by this, so
> > it. TTYL
> >
> > > {Original Message removed}

2001\08\09@153816 by Bob Ammerman

picon face

In many respects the F628 is just a better F84. There have already been a
few threads on the gotcha's when subbing the former for the latter.

One thing to watch out for with the clock displays: depending on the chip
they were intended to work with they may multiplex in very interesting ways.
(As in the the old Chinese curse: 'may you have an interesting life'). I
have some such displays which have only two cathodes and something like 14
anodes, wired in a funny scrambled sort of way. I had to build some pretty
tricky code/tables to translate from the desired output to the correct
output pin states. Also be aware that a lot of these displays are not a true
4 digit display. Often the high order digit contains only the segments
needed for a 1 (or sometimes a 1 and a 2).

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level

{Original Message removed}

2001\08\09@160406 by Mike Kendall

   Thanks for thePICinfo.  I'll look for those 16F628 threads on the
listserv to try  to learn more. I think these LED's may just work for PIC
use.  Luckily they are the Lite-On LTC-3710series that have  all 4 digits.
The LTC-3718 series have the 1 as the 4th digit as you described on the same
data sheet as the 3710's.  Here is a URL link for the data sheet:   By the way, there is an auction on ebay for 672
pieces (same as what I got) that is presently going for $26 if anyone is
looking for PIC LED displays
{Original Message removed}

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