Why does this board have two pins for PWM? : r/AskElectronics
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How to set a pin of Arduino UNO to a 25% PWM - Quora
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Control dc motor with pwm by using one dir and one pwm pins in both directions like Cytron MDD10A - Motors, Mechanics, Power and CNC - Arduino Forum
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![The Full Arduino Uno Pinout Guide [including diagram]](https://images.prismic.io/circuito/8e3a980f0f964cc539b4cbbba2654bb660db6f52_arduino-uno-pinout-diagram.png?auto=compress,format "The Full Arduino Uno Pinout Guide [including diagram]")