John Payson wrote:
>
> An alternative design will drive 8 digits (no DP's) with eight port pins,
> eight transistors, eight resistors, and no external chips.  The transistors
> are wired as emitter-followers on the PIC's eight port pins and feed the
> commons on the eight digits.  Each digit's segment wires connect to the seven
> port pins that don't drive that digit's common.  The eight resistors, between
> the port pins and the segments, limit the display current.

I've just finished a serial input six digit (I only needed six)
led display using John's great post.

I am using two digits for speed (kmh) and four for rev's (rpm)
I wrote it in basic, compiled with PBC and it's running on a 16c84
I am using a second 16c84 to compute the speed, rev's, oil
and later anything else that comes to mind

In case anyone is wondering it's for my daughters toy (50cc)
car and as she's only six, two digits for the speed will be
sufficent for a few years to come

Anyone interested in the source code
it's your's

Thanks John

--
Peter Cousens
email: peter@cousens.her.forthnet.gr  phone: + 3081 324450, 380534
snailmail:  Folia, Agia Fotini, Karteros, Heraklion  Crete, Greece.