What is PWM?PWM pulse width modulation definitionPWM pulse width modulation (PWM) is a method to digitally encode analog signal levels. By modulating the width of a series of pulses, the desired analog signal is obtained equivalent.Working principleThe basic principle of PWM technology is to use the digital output of the microprocessor to control the analog circuit. A square wave with a fixed frequency is used as the carrier signal, and the average voltage of the output signal is controlled by c