How can I measure percentage of pulse signal

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Dogukan Arat
Dogukan Arat 2018-7-24
评论： Ryan Takatsuka 2018-7-25
I am working on a project. I need get pwm signal on raspberry pi then find the open interval which means percentage of the signal. I design a system but it does not work properly.
I can reach the correct value without delay but when I decrease the percentage it keeps max value.

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Ryan Takatsuka
Ryan Takatsuka 2018-7-24
You are probably better off filtering the PWM signal to find the interval percentage. See the attached example.
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Dogukan Arat
Dogukan Arat 2018-7-25
It works thank you but my period will be 20ms. When I change the period of the pwm, it does not work. How can adjust the filter for this period?
Ryan Takatsuka
Ryan Takatsuka 2018-7-25
If you have the Signal Processing Toolbox, you can use the filterDesigner app to design a lowpass IIR filter. Otherwise, there are some online tools such as this one: Online Filter Designer
I've attached an example of a filter using a 0.020 s period with an arbitrary sampling rate.

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