[SOLVED] LED ON/OFF based on PWM using PIC

natraj20 said:

@prmurthy

I just wanted to make sure of your application in your own words. I'm afraid you have not understood the concept of pwm. Please take a look at this pwm fundamentals.

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I surely accept this. I already told that may be I have not understood the PWM properly. No Doubt about this. I really mean it.

natraj20 said:

First of all, what pwm is that - it is not an on/off control.

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Here is one basic question that is dependent on heater typically AC. Do they use PWM for reducing the voltage for various temperatures ??.

natraj20 said:

Now you would have understood your mistake in the above sentence - by varying the duty cycle, you do not vary the time period but the time during which the switch is on.
For ex, For the time period of 1s
50% duty cycle => Ton = 0.5s and Toff = 0.5s
25% duty cycle => Ton = 0.25s and Toff = 0.75s

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Yes, I agree and I am sorry for bothering you all which I really do not study correctly. I am once again thankfull to all of you and I am sorry for any kind of mis-speach.

Thankyou all