I am building an automotive data logger using a myrio and am looking for the best way to get tachometer RPM data onto the myrio. The output sinal I have is a 12V square wave. So if I were to using an analog read It would need some kind of voltage divider to scale it to about 5V. But can an anlog input have a high enough frequency to not miss any data. I believe at red line of the max frequency I will need to read is about 250Hz. So I would need to log at over 500 Hz and still have enough overhead for other functions I have in my code. I would guess a better way to do this would be using the fpga to find time between pulses to calculate rpm. But I am not sure how to wire this with the existing 12V tach signal. Another option would be a seperate magnetic or optical tach device that a mount on my engine which would be a last resort effort if I can not using the exisiting signal. Any suggestions to accomplish this would be greatly appreciated!

Academic Hardware Products (myDAQ, myRIO)

myrio tachometer implementation

Hi Farhad,

If you don't hear back from someone on this discussion about a resolution specific to that problem, my best guess is that the myRIO software has been corrupted in some fashion on the computer you're porting the application to. I'd recommend repairing or reinstalling the software on the computer as a possible solution.

Andy G
Applications Engineering
National Instruments

Message 11 of 12

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Hey Andy,

Thank you so much! You are absolutely correct! I had other versions of LV installed, and when I uninstalled everything and installed the program again, I didn't get that error.