[Gmecm] sound card crankshaft signal generator

[Darrin Garrett]

Well like I said it does not have a cam signal so you would not be able to use this until I implement it.  The cam signal needs to be synchronized to a specific cylinder, I guess I could make in configurable to be any of the cylinders, because I do not have the over lapping wave forms for the DIS and 24x crank shaft signals. 
   
  I have a USB external sound card at work and I will bring it home to see if I can add the cam signal.
   
  Basically how it works it I dynamically create an audio stream representing the discrete wave form every 40ms using a GUI control as the input for RPM and stream this audio out the sound card.  The signal level is about -1V to +1V peak to peak and I need to run this through a comparator circuit to change the levels to 0VDC to 5 or 12VDC for the hall effect type sensors ( LS1 and Northstar 24x 2001 and newer).  for the reluctant sensor types I will run it through a 555 single shot circuit that fires on every negative edge.
   
  I was not going to do all this work if no one was interested.

  Heck yea!

Send me the details, plus whatever you have done so far..

Thanks!
Matt Teagarden

Darrin Garrett wrote:
> I have written some software that uses a sound card from a PC (Win XP ) to generate 24x (LS1) and 24x (northstar) crank signals. This signal levels are not correct but the timing and edges seem accurate. Its has a fairly easy to use GUI. I was going to add the DIS output too, but have not done this yet. All signals will need to be conditioned with external opamp circuits, which I have not done yet and don?t know when I will get to it. Especially the reluctant signal types, ( DIS and Northstar 24x). I am also adding a feature that will allow you to record the output and play it back. And one more thing all of this is useless unless there is a synchronized cam single supplied as well, which I hope to get to with the addition of a second < $20 external or internal sound card. I do not have an LS1 or DIS engine/system so they are of no use to me, but thought some of you could use this on your engine simulation bench, for free of course when it is some what finished. 
> Any takers?
>
> 
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