ECM Bench Problem

[thergen at svn.net]

Hi Bruce,

Another possible hardware only solution that doesn't have all the LEDs
would be to use two 74LS161 counters that drive a 2732 eprom (or larger
eprom).  A table could be programmed into the eprom that would drive an
output high at specific counts.  Another eprom output would be used to
preload the counters at a specific count and result in a 36 count
repeating sequence.

This solution would involve wiring together two 16 pin chips and one 24/28
pin chip and would probably be easier than a using a bunch of decoders or
shift registers.

Let me know if you're interested and I could probably post a design on the
ftp site in the next couple days.

Tom

On Thu, 9 Dec 1999 thergen at svn.net wrote:

> Hi Bruce,
> 
> Are you looking for something that will drive 36 LEDs in *sequence* (1 of
> 36 on at any time)?  Perhaps a zero software solution that has a
> clock input that causes next LED in the sequence to light in
> response to each clock pulse?  
> 
> Tom
> 
> On Thu, 9 Dec 1999, Bruce Plecan wrote:
> 
> > 
> > | Not sure what you're asking for, can you describe it a little more?
> > 
> > The crank sensor reads 7 notches in the crankshaft,  6 are 60d apart, and
> > the 7th is 10d offset from the first.
> > 
> > So the timing for the pulses are    0d, 10d, 60d, 120d, 180, 240, 300, and
> > then repeat that pattern....
> > Bruce
> > |
> > | --steve
> > |
> > | Bruce Plecan wrote:
> > | >
> > | > Anyone know of a very simple cheap electronic way to illuminate 36 leds
> > in
> > | > sync.
> > | >
> > | > I need to pick the signal off of the 1-3-6-12-18-24-30,
> > | > Like for a 2.8/3.1L, DIS,  crank sensor would generate.
> > | > Grumpy
> > | >   Data Dictionary avaliable till midnight, (12/9/99), after that you'll
> > have
> > | > to find someone with a copy....
> > |
> > | --
> > | Steve Ravet
> > | steve.ravet at arm.com
> > | Advanced Risc Machines, Inc.
> > | www.arm.com
> > |
> > 
> 
>