Read voltage and process realtime.

[EW]

I have a PCI-6251 DAQ card and the DAQ Documentation and SW Combo kit.

I would like to write a Visual C++ program to read an analog voltage and process that voltage realtime.

I noticed the function DAQmxReadAnalogF64.  But it seams that I can only process the readArray after it is filled.

How do I read one analog input sample?  So that I can process it immediately.

Thanks,

Kevin

[Stuart_G]

Why don't you just use 1 for the numSampsPerChan?   I have to warn you though if you do that you won't be able to run at very fast rates in your application.

StuartG

[Laura F.]

Hi Kevin,

Just to add to Stuart's suggestion, please take a look at the DAQmx C examples that install with the driver located at C:\Program Files\National Instruments\NI-DAQ\Examples\DAQmx ANSI C on your computer.  In particular, navigate to Analog In >> Measure Slow Varying Signal >> One Sample. 

Thanks!

Laura