I have tried R=1k and C=47uF
R=4.7k and 69uF

here I got good dc o/p for 100Hz(80% duty).

The values are too high.
I am worried if I change the frequency then again fluctuations came then what I do?

Also the o/p I am getting is 3.6V. It is very less.

Please suggest

 

I have tried R=1k and C=47uF
R=4.7k and 69uF

here I got good dc o/p for 100Hz(80% duty).

The values are too high.
I am worried if I change the frequency then again fluctuations came then what I do?

Also the o/p I am getting is 3.6V. It is very less.

Please suggest

Why do you think 3.6V is less ? It can be read with a 10-bit adc and if there is fluctuation of lsb then can you shift the adc result 1 or 2 bits to right and see if that helps.

 

I wanted at least 4.8V for my project.

This pairs are not giving fluctuations for 100Hz 88% duty.

Suppose they give fluctuations at other duty then ?

 

I wanted at least 4.8V for my project.

Reason ?

This pairs are not giving fluctuations for 100Hz 88% duty.

Suppose they give fluctuations at other duty then ?

Don't have Proteus to test ? I will test it in Proteus and provide the results. What values are you using for R and C ?

Are you not able to scale the 3.6V to pwm duty. If voltage is less can't you shift the adc result 1 bit left ?

 

R=10k and C=47uF
R=4.7k and 69uF
R=4.7k and 47uF
R=1.5k and 100uF

 

R=10k and C=47uF
R=4.7k and 69uF
R=4.7k and 47uF
R=1.5k and 100uF

How you got two different capacitor values for same resistor value ?

 

I have tried adjusting those values and found those results.

 

I have tried adjusting those values and found those results.

What is the reason for using that microcontroller ?
Why can't you use a different micocontroller ?

 

Cost saving and smaller. Also wanted to save PCB spacing.

 

Cost saving and smaller. Also wanted to save PCB spacing.

You can very well use SMD version of PIC12F1840 (8 pin PIC) for your purpose. SMD version for production and DIP version for breadboard testing.

If you can use PIC18F46K22 then I will provide you a code.

 

Please share the code. I will order for the samples.

 

Please share the code. I will order for the samples.

Ok. Did you decide the R and C values ?

My code will use mikroC PRO PIC ADC and PWM libraries. You cannot use it for AVR.

To scale the adc reading to pwm duty I need to know the adc input voltage you are getting for different PWM frequency and duties.

 

R=10k and C=47uF
These are the values.

 

R=10k and C=47uF
These are the values.

Let some expert answer on the value of 47 uF Capacitor. I am not sure if a 47 uF capacitor can be connected across the adc input pin of PIC.

 

Ok. I will wait for your update.

 

Ok. I will wait for your update.

Can you use additional CD4017 with PIC12F1840 ?

Only order PIC12F1840 if you can also use CD4017.

 

No . I cant use CD4017.

Please share the code.

 

No . I cant use CD4017.

Please share the code.

Can you use ATTiny15 or ATTiny25 ? If these devices support generating 100 Hz PWM then I will write a code for you.

 

Please write a code for ATtiny15. I will try to implement the same in ATtiny 10 and will share you the results.

 

Please write a code for ATtiny15. I will try to implement the same in ATtiny 10 and will share you the results.

Sorry, my compiler doesn't support ATTiny15. I just checked it. You only option is ATTiny25.