Hello Everyone, I am using an NI 6002 to gather voltage data across two channels. I want to attach a switch to the system allowing me to write data by pressing a physical button. Write data when the physical button is pressed. Stop writing data when the physical button is released. It is my understanding that I cannot have digital and analog together in the same task so I separated them to their own respective tasks. The NI 6002 is specified to 5V, so in order to trigger the system I have supplied the 5V though a battery. Here is the switch circuit I used where the light bulb in Digital Channel 0. When I pressed the button it does not write to my VI. Instead I get error Property Node DAQmx Trigger (arg 1) in DAQmx Start Trigger (Digital Edge).vi:3930001. I think I am super close, but I just can’t determine what I am doing wrong. Attached is my VI Any advice would be appreciated! Thanks

Does it work correctly? Some things I noticed from a casual glance at the code: Index array is resizeable, and if you want the two first elements in order, you don't even need to wire the indices. Index array also probably should be inside the case structure, because the other case does not need the individual elements. Your "calibration" case structures architecture seem a bit strange. Why is the left button and outer case structure even needed? Your queue should probably be a 1D array. The second dimension serves no purpose. Your formula nodes seem completely unnecessary. The data of the two shift registers keeping track of the max should be wired across the case structure above, eliminating the local variables. Or use feedback nodes instead. etc. etc. (I cannot comment on the DAQ parts, because I don't have DAQmx installed. All I see is placeholder code)

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Attaching a Physical Switch to start/stop Analog Data Acquisition

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Thank you for the advice and yes it works correctly.

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Attaching a Physical Switch to start/stop Analog Data Acquisition

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