One nice thing about the sine wave is that the changes in voltage through the wave are continuous. I’ve had some success creating “relatively” clean 100Hz waves but going much higher than this results in the wave breaking down entirely. The fewer cycles you have per wave the more misshapen your output wave will be. As an example if I wanted a sin wave with a frequency of 100Hz I would only be able to use approximately 10 PWM cycles per sine wave. The Arduino has a maximum PWM frequency of 980Hz which is quite low, especially when working in the audio space. Know Thy Limitsīefore I go to far into this project I want to talk a little bit about the limitations of the Arduino. I’m going to focus on creating a workable 10Hz sine wave and then in forthcoming posts I’ll look at manipulating the frequency and modelling more interesting wave-forms.
I want to get my Arduino outputting sine waves. Today it’s time to apply those basics to something a little more interesting. I’ve spent the last few weeks going over the fundamentals of PWM and implementing them on my Arduino Uno.
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