i want to generate a PWM signal to control a dc motor using a DAQ NI 6229 and host computer running LabVIEW 8.20

[kennyadenusy]

i want to generate a PWM signal to control a dc motor using a DAQ NI 6229 and host computer running LabVIEW 8.20 the signal i want to generate should have a freq of 52.08Hz and a Duty Cycle of 0.07 how can i get this done and the i want the signal output in ctr0  out in my SCB-68

[JonBowers]

Hi Kenny,

Have you tried any of the DAQmx examples? Try starting with the Gen Dig Pulse Train Continous.vi and change the frequency and duty cycle by writing to a DAQmx Channel property node. The properties are under counter output>>pulse>>frequency.

Regards

Jon B
Applcations Engineer
NI UK & Ireland

[bird777]

Hi,

This example is great. Could you help me , how can use it to change the duty cycle continously? Because here it can use only fix settings.

thx,
Bird

[JamesC]

Hi Bird,

Please can you try the attached code and see if it works for you. I have moved the duty cycle control inside an event structure in the while loop, so when the value of duty cycle changes, we can update a property node that should update the pulse out specification.

Regards
JamesC
NIUK and Ireland

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