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Once knock detection and on-board wide band sensor controller is also added to the wish list, it would be safe to say that the chance of one guy pulling this off is not very high.
You're just not an optimist!
Seriously, I don't expect this to be a one man project. Knock detection would be hard without a dyno for each engine. Also spare engines! Wide band is cheap on the aftermarket already, but with an open project like this anyone can work on these things. There is example code provided for the knock detection by the chip manufacturer...
I've figured out how to make pdf's of the schematics, so you can expect to see them soon. I need to pick a copyright license and it's daunting. It seems the choices for hardware are more limited and untested and etc.
I need a name for this unit, does anyone have a cute idea? Bang box, as in "Suck, Squeeze, Bang, Blow" might work. Open to suggestions...
Right now I'm working on some stuff for the power to the unit. Still worrying about: reverse battery, alternator load dump, cold cranking and the inrush current when it gets turned on.
Of these the reverse battery seems a problem. Lot's of the parts that are being used have protection against this, I think it's part of automotive standards. More careful reading shows though that some of the parts are protected simply because they turn on! I think that might include the coil drivers, but I have to check again. So there is a lot of stuff to protect. Maybe just a really big diode shared among the coil grounds would work.