Pulse Width Modulation:
PWM uses digital pins to transmit square waves of various frequencies (a wave's frequency is described as the number of high level, then low level, outputs per second). The frequency is usually fixed. The longer the pins transmits a high level signal, the larger the voltage. This is called the pulse width. The percentage of the full cycle that is made up of a high level otutput is called the duty cycle. The larger the duty cycle, the larger the voltage. It is useful way for a digital signal to control an analogue circuit.
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