Ok, now I am feeling totally noob again...
Three boards.. 2 MS3s and one MS2...trying to trouble shoot the optical input for one of them and I cannot get the system to work on any of them.
I scoped the U3 and I get a good wave on pins 1 and 4 but it will not pick up rpms. One board I just assembled today (to replace one with short...see other thread) but now none of the boards are working using optical input and they worked just a few days ago. Guess my brain is fried from 4 straight days of banging it on the wall....lol
If I hook a 1k ohm resistor directly to pin 5 from optoin (using 5v sesnor) it picks up rpms and works fine for all boards. When I use a pull-up resistor from 5v to optoin it doesnt work. I want this working and dont want to have to use VR in...pots are a pain to adjust in car with MS3x.
please help
thnx
Optical trigger
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Re: Optical trigger
Can you clear up what component pin 5 is on?
Matt Cramer -1966 Dodge Dart slant six running on MS3X