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waveform dt doubt

Hi,

              I am trying to blank the duty cycle after a specified input time. My input time is varies between 0 to 2000ms according to the user interest and the duty cycle frequency of a PWM is 400Hz. I wonder how can I blank the output PWM after user specified time.

 

             I just started to use dt to match the user input time and then blank the remaining duty cycle but don't have any idea how to use dt to compare with the input time.

 

Do someone help me?  

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Are you trying to stop the PWM generation after a specified time? PWM is a waveform?

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