PiDuino Library

setPwmFrequency(pin, frequency, dutycycle)

Sets the PWM (Pulse Width Modulation) wave frequency in Hz and duty cycle.

Parameters

pin - The GPIO pin number.

frequency - PWM frequency (in Hz). Available ranges are between 19 and 37500.

dutycycle - PWM duty cycle. Available ranges are between 0 and 255.

Returns

None

Example

#include <Arduino.h>

int GPIO_PIN = 12; // GPIO12

void setup() {
	pinMode(GPIO_PIN, PWM_OUTPUT);
}

void loop() {
	// Set PWM to 100 Hz and 25% duty cycle
	setPwmDutyCycle(GPIO_PIN, 100, 64); 
	delay(1000);
	// Set PWM to 1 Khz and 50% duty cycle
	setPwmDutyCycle(GPIO_PIN, 1000, 128); 
	delay(1000);
	// Set PWM to 10 kHz and 75% duty cycle
	setPwmDutyCycle(GPIO_PIN, 10000, 192); 
	delay(1000);
}

Notes

• The default PWM frequency is 490 Hz
• PWM_OUTPUT mode uses the internal PWM hardware of the BCM283x SoC.
  The available PWM pins are the followings: