Pulse Width Modulation (PWM) is a method of controlling the power used in most electronic devices, for example on the PC Power Supply, UPS or power supply2 on other electronic devices. not only used to control power, the PWM can also be used to regulate electronic devices such as servo motors.
As the name Pulse Width Modulation or Indonesian language Pulse width modulation is a form of voltage signal is changed change the pulse width to be drawn more details can be seen below.

Pulse Width Modulation (PWM)

In the picture above shows there are five kinds of fruit with 5 PWM Duty Cycle value 0%, 25%, 50%, 75% and 100%. Duty Cycle is a parameter that indicates the ratio of the PWM signal is logic 1 (5 volts) and the signal logic 0 (0 volts), for example:

PWM Duty Cycle 25% with a period of say 100ms will mean a logic 1 on the PWM signal is 25% of the total signal period or 25% of 100ms = 25ms, while for the signal to the PWM logic 0 is the remainder or 75 ms.

The use of PWM in power control is more efficient when compared with the conventional method of controlling power (resistive circuit), since no power is wasted into heat.

PWM can be generated in several ways one of them is with a Microcontroller and use Timer IC 555.

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