rpm counter

[tedstruk]

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

 

[Gryd3]

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

Can you elaborate on what you want to actually build?
An LED display could be graphical, or could be a few segments...
Additionally, if you shared more details we may be able to set you on a path that isn't so fraught with nightmarish retro-fitting.

 

[tedstruk]

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...

 

[davenn]

I have an salvaged LED display that I want to build a sensor readout from.

what sort of LED display show a pic and any info written on the display please

 

[tedstruk]

Its out of a JVC DVD recorder that went fritz

 

[tedstruk]

upload started working

 

[tedstruk]

pinouts of the counter readout.

 

[73's de Edd]

Sir tedstruk . . . . .

Thats using a rom / mask programmed U/P with basic display orientation towards time info as HRS:MIN:SECS
also ALPHANUMERIC DISPLAY and finally a counter capability of 999.
All of these being separately partitioned, so I don't think you will be using this unit for what you are wanting to do UNLESS having 95 % of the ancillary proccessing apart from this unit and ONLY using this unit for its display interfacing.

Perchance should this " foreign " relate to the foreign . . .Yamaha . . . . . cycle . . . .a . . .la . . .V15 . OR a . . .1983 Yamaha Venture Royale XVZ12TDK . . . . . . and have you even gone back and read my added writeup of :

https://www.electronicspoint.com/threads/old-expired-83-brain-needs-rework.281323/#post-1713876

as its POST # 19

73's de Edd

 

[davenn]

upload started working

That isn't a LED display, it's a VFD, Vacuum Fluorescent Display ... will be VERY difficult to try and make work

 

[tedstruk]

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?

 

[tedstruk]

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