Question

Analog Pins in the Arduino boards work on the principle of PWM. What is the full form of PWM?

(a) Pin Wide Modulation

(b) Pulse Waveform Modulation

(c) Pulse Width Modulation

(d) Pulse Wave Modulation

I had been asked this question in examination.

I need to ask this question from Board Hardware Specifications in division Board Specifications and Types of Arduino

Answer 1

Correct choice is (c) Pulse Width Modulation

The best I can explain: Since perfect analog waveforms can’t be achieved on a digital circuit, Pulse Width Modulation is used to create pseudo analog waveforms by varying the “ON” and “OFF” time of a pulse continuously hence creating a series of pulses whose “width” can be modified according to the need of the user. Here “width” refers to the “ON” time of the pulse. Hence the name Pulse Width Modulation.