Dead SPEEDO and ODO

It's the same going into the cluster as it is going out.
AFAIK, no one has a the info you are looking for.
Best we got it is in the pic below. @Dm93 would be the guy to ask.
The scope capture below is his.

 

@Dm93 do you happen to have this data correlation for tach pulses/min vs rpms? If not, I guess I will be hooking up an arduino and multimeter, then reving in my driveway for my neighbors lol

 

I'm assuming your using the Tach line?

3 Pulses per revolution of the engine (0-12v Squarewave).

This is taken at about 800 RPM, Tach is in Red and Crank signal is in Green. The cursors are at the sync notch on the crank signal (1 revolution).

 

Thank you.
I figured you have what he needed.

 

This is great info. I think the tach signal is 0-5V, and the speedo might be 0-12V, based on the FSM?


Also, I am still a little confused about the time factor. So for every 3 pulses it is an rpm, but is the 10ms sample listed equal to one minute? So the more waves within the 10 ms, the higher the rpms, correct, but always a 10ms sample time?

 

It's 5v per division, each of the tick marks on the graph is a division. Same thing with the timebase, it's 10mS per division x 10 divisions is 100 mS total on the screen.

 

Ahhh gotcha, so:

(60000 ms) x (3 pulses per rpm) / (duration between pulses in ms) = engine RPM

So I can just measure the duration for every time the 5V signal goes high. Make sense?

 

If I'm following what your trying to do I think so, it's a 12v signal though not 5v.

 

Okay, then I will have to step it down with a linear voltage drop regulator or a buck converter. Im trying to read into an arduino, and the max input is 5V. That adds a layer, but nothing that should interfere functionally as long as it responds to the pulses rapidly.

 

@SmallerBaller

Check out the blue arrow.
The GREEN numbers is Voltage.

Maybe that will clear it up......

 

That's for the green trace but here's the full view with the red trace scale on the left.

 

Yeah....

I still can't figure out why TW compresses the file if you Copy/Paste a picture directly to the reply box.

Blurry pics......
But hopefully OP sees what we are talking about.

 

Yep, that makes perfect sense to me, appreciate the inclusion of the scale! I will just have to take every 12V pulse and drop it down to a 5V pulse to read, in my particular case. I am not OP, I just hijacked this thread lol but I really appreciate all the help. There is a chance I may bug you guys again in the future once some circuit parts arrive, but I think I am all good for the time-being! Thank you very much!

 

The first one was my bad, I was in a hurry and cropped off the scale. I'm still knee deep in computer parts trying to get done with this build and getting things moved around.