Reduce PWM Frequency Arduino DUE

Question

I'm newbie in arduino due. I need to reduce the default PWM frequency of arduino Due. Anyone have any tutorial to do this? (Frequencys like 25hz, 50Hz for example)

I read in some posts, if i change the PWM frequency, i make changes in internal timers of arduino and i loss functions like delay(), millis(), etc.

Exits any form to not lose these functions?

Thanks a lot!

• ratchet freak: 25 and 50 hz square wave can be generated by software easily

Answer 1

The Palatis Softpwm library can generate PWM on any digital pin with (almost) any frequency. Example for 25Hz:

#include <SoftPWM.h>
SOFTPWM_DEFINE_CHANNEL(0, DDRB, PORTB, PORTB2); //Arduino pin 10
void setup() {
 // begin with 25Hz pwm frequency
 Palatis::SoftPWM.begin(25);
 Palatis::SoftPWM.set(0, value); // value is 0 to 255 just like normal Arduino analogWrite
}