Pwm value what is

In the graphic below, the green lines represent a regular time period. This duration or period is the inverse of the PWM frequency. In other words, with Arduino's PWM frequency at about Hz, the green lines would measure 2 milliseconds each. Once you get this example running, grab your arduino and shake it back and forth.

For example, a variable frequency drive motor produces a response like analog device in the real world. The separate pulses that the VFD motor gets are not discernable to us; as far as we can see, the pulses are so fast usually somewhere in the milliseconds that by real world standards it just seems like a motor ramping up.

The duty cycle can change to affect the average voltage that the motor experiences. The frequency of the cycles can increase. The pulse can even be increased in length. Pulse width is directly related to duty cycle, so if you decide to increase the width of a pulse, you are just altering the duty cycle. MCUs are digital. An example of something that can create a true analog output would be a transducer something that directly translates physical phenomenon to an analog signal. But transducers are another analog discussion.

See our Engineering Essentials page for a full list of cornerstone topics surrounding electrical engineering. Take me there! Need Help? Mountain Time: Shopping Cart 0 items. Product Menu. Today's Deals Forum Desktop Site. All Categories. Development Single Board Comp. Contributors: JordanDee. What is Pulse-width Modulation? Duty Cycle When the signal is high, we call this "on time".

Examples You can control the brightness of an LED by adjusting the duty cycle. Resources and Going Further Pulse width modulation is used in a variety of applications particularly for control. Comments 1 View Paginated Print.