Convert a TTL to RPM numeric display.

Hardware
cDAQ NI 9172
Module: NI 9401
Monarch Instrument’s Remote Optical Sensor (for measuring RPM/pulse counts)
Software
NI Sound & Vibration Assistant
NI Signal Express
LabView
Experience Level
Beginner
My objective is to read and record accelerometer and engine speed data together so they are time stamped the same. Setting the accelerometer up was easy… the RPM, not so easy.
I have been trying to convert a 5v TTL signal from an optical sensor, which is used to measure RPM, in NI Sound & Vibration Assistant. The optical sensor is a stand alone, self powered system with a output signal of “TTL compatible pulse (0 to 5VDC)”.
I’ve started a project in NI Sound & Vibration Assistant, “Add Step”, “Acquire Signal”, “Digital Input” and “Line Input”. On the Step Setup Tab/Configuration Tab, I’ve selected my channel, Acquisition Mode set to Continuous Samples, Rate set to 1.3kHz. Then on the Step Setup Tab/Advanced Timing I had to select “On Demand” for Sample Clock Type due to error message(s). “On Demand” is the only way to get the signal to appear on the Step Setup Tab’s graph. The signal is a square wave represented by 0 and 1 (0s and 1s are overlaid on the graph). When I block the optical sensor view, the signal goes flat represented by 1.
I’ve also messed around “Acquire Signal”, “Counter Input” and “Edge Count” with the same results.
Question: How do I convent this TTL signal to a RPM output… either as a numeric display?
Thank you in advance for any help.

Ferzo,
Great example! I am able to get a RPM numerical value… however when my rotating component slows to a stop, the processed data (logging) stops updating around 500 RPM. I was expecting the value to drop to zero as my source reached zero. Plus some of my speeds, that I need to measure, can be a low as 1 to 100 RPM.
Please note that your screen shot of the formula page is different than mine. Mine is missing the “Input and Output Scalars” window… any ideas?
Thanks,
Team Stoney
Attachments:
RPM Ending.ppt ‏257 KB
RPM Formula Step .ppt ‏152 KB
RPM Result .ppt ‏156 KB

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