Pic Power

[Davidpower]

Hi Guys & Dolls!

i got an electronic problem and don´t know if it could be solved by a single PIC or if I have to use two.
Heres the Problem concerning an automobile ignition circuit:
I got pulses with a frequency ratio of about 20 to 1 : from ca. 150 ms (engine cranking) to 2 ms. The coil needs 1 ms for charging.
first process: measuring pulse lenght (pulsin could do that)
second: starting charging the coil after "pulse lenght - 1 ms" that leaves the one ms and the follows the ignition .
this has to be done real fast! and the pulse lenght changes often.

do I need two pics?or three? is PBP fast enough?
tried this with a 12F629 without success because i need one loop for pulsin and a second one for the output.

can anyone help? Hi mister_e! (did me a favor two weeks ago)

[Acetronics2]

Hi,

I do not wear skirts ...

but have realized such an electronic ignition device aboard 12F629/16F84 ...

Using assembler ... works really fine . and there's room left !!!

Using PbP( with a touch of assembler ... ) ... did not give - to the day - really usable results for a 0° crank detector setting.

research is in progress ...

But one thing is sure ... you must have many timers running at the same time !!!

Alain

[Davidpower]

Hi Ace,

you got that already running? I don´t need a 0° crank detector, a constant difference to 0 would do.

how do I get that software/schematic? left hand washes right foot or so?

[Acetronics2]

Hi,

It's in French ...

But it's here :

http://www.alpine.free.fr/5tech/tech/notes-aepl.html

also Have a look here:

http://www.transmic.net/gbindex.htm

and here :

http://autos.groups.yahoo.com/group/DIY-CDI/


Alain

[Davidpower]

thanks for that.
but: i don´t even know 0,001% of the french language.

Argl-Garg!

loaded some software fromthat site, didn´t even know what for and the Windows Instructions in french......could be Hindi or Serbocroatic or the famous african language with the lot of klicks....

[Acetronics2]

I had a really nice Excel sheet to load the ignition timings, processor and options ... into theASM program ( using MPLAB ) ...

But I recently discovered the Excel functions are in various languages ... so, the sheet developped with a French edition doesn't work in Foreign countries.

Some more thanks to Bill Gates ...

Alain

[Davidpower]

yeah the english only like singles which doesn´t hdisturb,

but the software is only in hex.......as one would expect. so i coulnd´t modify it for my needs.