ECM Bench Problem

[Roger Heflin]

On Thu, 9 Dec 1999, 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.

Use  a pic?  That seems to be the answer for almost anything.

Using discrete logic you owuld want to use a
parallel-in/parallel-out shift register.  You would need 4-8bt ones,
and 1 4-bit one, or 9 4-bit ones.   Use th parallel in to load the
initial state and the parallel out for the signal you want to out.
The shift-in/shift-out is cascaded from the previous to the next one
and each time the input clock triggers it willl shift if setup
correctly.  That is if you can still get discrete logic.  You will
also have to carefully setup hte LEDs to not sink too much current
into the outputs.

				Roger