variable pwm freq and dutycycle !!

Projects Programming
1

hi folks :slight_smile:

is anyone can tell me, can i controll pwm frequency and pwm dutycyle with 2 potantiometers ?

im thinking about this project and i searched thousend of times but i didnt find my answer yet.

if answer is yes/no please explain to me....

thanks in advance and have a great day :))

2

Use analogWrite(dutyCycle) to change duty cycle. With a pot use analogRead(potPin) and divide the result (0-1023) by 4 to get the 0-255 for analogWrite.

dutyCycle = analoRead(potPin) / 4;
analogWrite(dutyCycle);

Why do you want to control the PWM frequency?

3

Have you searched 'varying pwm frequency' on this site?

4

groundFungus:
Use analogWrite(dutyCycle) to change duty cycle. With a pot use analogRead(potPin) and divide the result (0-1023) by 4 to get the 0-255 for analogWrite.

dutyCycle = analoRead(potPin) / 4;

analogWrite(dutyCycle);




Why do you want to control the PWM frequency?

Cause i want to make a dc dc converter. thanks for reply. i know how to change dutycyle already [i should say that before :slight_smile: ]. i just need to know how to change freq with potantiometer..

5

The hardware timers can generate PWM. You adjust the frequency of the PWM by setting 'prescale' and 'TOP'. You set the duty-cycle by adjusting the Output Compare Register between 0 and TOP.