wb lcd display

[Dave Mumert]

Hi

I checked over the drawing very briefly.  I have used the LCD driver before
and it works good and is easy to program.  Have you thought of using a boot
loader for the 16F877?  Check at
http://www.xs4all.nl/~wf/wouter/pic/wloader/index.html  for a list.  If
people were to buy the PIC with the bootloader pre-loaded they would need no
other hardware to program it with their own code.

You might consider using one of the National regulators specifically
designed for automotive use.  They are protected against reversed batteries,
double battery boosts and 60V load dumps.  I have been using the LM2931, it
is cheap and comes in several packages, the only downside is the requirement
for a 100uF cap on the output.  This regulator along with the appropriate
transorbs should work well.

Dave Mumert

> > For the 12 -> 5v p/s, I would do something close to how
> > the WB UEGO circuit is powered. Just change the 78L08
> > out for a run-of-the-mill 7805 regulator chip. Maybe add
> > a 1N4001 diode in series with the input.


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