Discuss the role of PWM pins in Arduino UNO.

Question :

Discuss the role of PWM pins in Arduino UNO.

PWM stands for Pulse Width Modulation technique, is used to convert the digital signal into an analog by varying the width of the Pulse. The PWM pins are used for giving the desired analog output. They are used to set the LED brightness or to run Stepper or Servo Motor or anything which require analog inputs.

Digital control is used to create a square wave, a signal switched between  on and off. This on-off pattern can simulate voltages in between full on (5 Volts) and off (0 Volts) by changing the portion of the time the signal spends on versus the time that the signal spends off. The duration of “on time” is called the pulse width. To get varying analog values, we change, or modulate, that pulse width. If we repeat this on-off pattern fast enough with an LED for example, the result is as if the signal is a steady voltage between 0 and 5v controlling the brightness of the LED.