What is PWM?

Pulse Width Modulation is a intuitive way to control voltage digitally. It pulses voltage very rapidly in such a way that it can reduce voltage to your desired voltage.

The main parts of a PWM signal are is period and its duty cycle. The duty cycle is what determines its voltage. the period length will determine if it works with the device you plan to use it with, generally the higher the frequency, the more compatible the signal will be for your device.

[gregwhite]

Voltage is not Duty Cycle X Voltage.

This is the way: duty cycle of a rectangular waveform, which represents the ratio of the pulse duration to the total period, affects the RMS value.

For a rectangular waveform with a certain duty cycle, the RMS value can be calculated using the formula:

Vrms = Vpeak X square root of duty cycle

Where Vpeak is the peak amplitude of the rectangular waveform.

As the duty cycle increases, meaning the waveform spends more time at its peak amplitude, the RMS value also increases. Conversely, as the duty cycle decreases, the RMS value decreases because the waveform spends less time at its peak amplitude.

[saskiavanhoutert]

A good explanation of the morse-signs history which results to the computer, Thanks.

[annashabaz]

Very clear, concise and complete! Thank you!

[JaimeLopez]

Please make more videos. I loved the explanation!!!

[BH]

Very interesting explanation, appreciate your effort and thanks a lot

[prabhakaranlayam]

Thanks...but waiting for more such videos

[akhil]

Woww Tat was a perfect demonstration :)

[alisleiman]

is it possible if pulse don't keep the same value for example x0=4V, x1=0V, x2=1V and x3=2V .how to draw the pWM signal

[maheshd.e]

I am using atmel 89c52...how to use in pwm?...