The duty cycle can vary between 0 to 255 which maps to 0 to 100% duty cycle in percentage.īy default, the waveform of the following frequency is generated by Arduino pins when called using the analogWrite() command. The first argument to analogWrite() is a pin number from which we want to get PWM signal. At each of these pins, a PWM waveform of fix frequency can be generated using the analogWrite() command. The function can generate PWM with the default frequency of each pin as mentioned in the above table. The analogWrite() function which is available by default in Arduino IDE is used to generate a PWM signal. The following figure shows these pins on Arduino UNO Board. But the overall concepts to generate PWM remains valid for other Arduino boards also. In this tutorial, we will use the Arduino Uno. It also lists the default PWM frequency of each pin. The following table shows the PWM pins for Arduino Uno, Arduino Mini, Arduino Nano, and Arduino Mega. The number of PWM pins vary from one Arduino board to another Arduino Board. There are 6 PWM pins available on the Arduino UNO board and the Pins number are 3, 5, 6, 9, 10, 11.

What is Pulse Width Modulation Arduino PWM Pins The duty cycle is defined as the average ON time of a pulse divided by the TOTAL time of the pulse, so basically in PWM, the duty cycle of pulses is changed.įor more information on PWM pins of Arduino, read this in-depth article:

This ON and OFF pattern generate full VCC voltage at the ON position and 0V at the OFF position. Digital control is used to create a square waveform by switching a signal ON and OFF repeatedly. In this technique, we use digital means to get an analog result. This means for how much time a pulse is in the HIGH state or in the LOW state from a given time is controllable. From its name, it is clear that in this technique the width of pulses of a waveform is controllable (changes).

Square wave generator in proteus 8