Control fan duty cycle dynamically in labview

[jkas]

I am trying to send pulse signals to my DAQ for control. However, it is only able to pick up the first duty cycle I input. The fan's speed doesn't change even when I change the duty cycle. Any help?

[Kyle97330]

Thanks for posting your VI, but it's in 2023 and a lot of us on the forums use earlier editions.  If you back-save it to 2019 or so a lot more of us can look at it.

[jkas]

2019 version attached.

[Bob_Schor]

I'm curious about the device you are trying to control.  I make low-frequency pulses (up to a few hundred Hz) with a DO line by writing alternating T and F to the DO line and doing the timing with a Wait (ms) function in a While Loop.  In another application, I program a Counter/Timer line with (again) a fairly low frequency and create DO pulses that drive a stepper motor.  I would expect to see a DAQmx Timing function in your code ...

What device are you using?  I assume it might be a USB-something, and you are using the so-and-so sub-system (AO, DO, Counter/Timer, etc.) -- please clarify.

Bob Schor

[Kyle97330 · Accepted solution]

Try adding a timing node, Implicit with Continuous samples, before the task starts:

[NIquist]

I think you have several problems here.  Take a look at the examples in Find Examples...