Partial schematic interfacing to an Arduino compatible device. Sorry for the bunching on the input side, I'm still learning how to use this drawing soft.
Wire colors on the input side are only confirmed on the Y chassis code. Others may use different colors.
EDIT: schematic removed - will upload to github - see link in sig
The LED + limiting resistor on pin 13 are usually present on all Arduino-like devices so I didn't number them. My ultimate goal is to develop a complete schematic and turn that into a single plane PCB with the Atmega (28 pin dip) directly onboard instead of using the Arduino device as a "daughter board". If that works out maybe we can arrange a group buy for a large quantity.
I'm hoping it's obvious, but just to be safe the the ancillary output circuitry on pin 4 (coil #1) needs to be duplicated for the other 7 cylinders.
Edit: R3 and R4 (the famous impedance matching network) is an approximation of potentiometer measurements from this post that produced ~4.29 volts on the EST line's diagnostic ADC channel. Testing and possible fine-tuning may be required (I can't find a 5.6k resistor in my substantial collection of "stuff").
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