How can I measure percentage of pulse signal
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Dogukan Arat
el 24 de Jul. de 2018
Comentada: Ryan Takatsuka
el 25 de Jul. de 2018
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.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/192504/image.png)
I can reach the correct value without delay but when I decrease the percentage it keeps max value.
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Ryan Takatsuka
el 24 de Jul. de 2018
You are probably better off filtering the PWM signal to find the interval percentage. See the attached example.
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Ryan Takatsuka
el 25 de Jul. de 2018
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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