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Old 07-06-2009, 03:39 AM   #2 (permalink)
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Join Date: May 2009
Location: Northeast Indiana, USA
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Dora - '98 Ford Explorer XL
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You need the Zener diodes in place to drain off extra voltage to the ground line.

As I understand it the Zener acts like an overflow valve, turning those high volt injector pulses into low voltage pulses that the ATMEGA chip can safely handle.

Either [No10: "Injector"] or [No20: "Injector"] is what you want to tap into.

Ideally you want to use the car ground and not the ground on the ATMEGA board.

Here is a simple page I made, mainly as a reference for myself but I was hoping it would help others.

How to build an MPGuino - EcoModder

I created the image on that page because all the other ones I found where kinda confusing.
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