rpm counter

I was told that all LED displays are primarily the same, and as long as I have the processor that fires its display, that I cold use it to build a signal counter. I want to build a signal counter to count field coil pulses from a crank shaft. but the stuff I have to build it with is "state of the art", and is so complex that I shudder when I think about having to retrofit it. signal processors aren't hard to build though, and so I would like to give it a try, even if I only use LEDs to identify the pulses. The coils are center tapped magnetic, and are fired when the crank passes them

 

I have an salvaged LED display that I want to build a sensor readout from.
I have a set of field coils on an oriental motorcycle and I want to be able to read the signals that I get when the I crank the engine over. The 4 sends are each one side of a center tapped coil and there are 2 coils, each has 2 sends, and the common of each is spliced into the center tap. The signal is generated by an inset magnet in the flywheel on the engine. My upload isn't working too... thats going to make this project really complex huh...

 

Its out of a JVC DVD recorder that went fritz

 

upload started working

 

pinouts of the counter readout.

 

I have never heard of a VFD before.....
No wonder I was confused.
There are some LEDS on the board, I suppose I could use them in a simple rotational trigger pattern, based on signal?
er uhm..
Do you have any use for it?

 

this unit probably failed cause I figured out how the LED worked...