PiDuino Library

tone(pin, frequency)

Generates a PWM wave at the specified pin and frequency with a duty cycle of (50%). The generated wave will not stop until you call noTone(pin) .

Parameters

pin - The GPIO pin number.

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

Returns

None

Example

#include <Arduino.h>

int GPIO_PIN = 12; // GPIO12

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

void loop() {
	// Set frequency tone to 1 KHz
	tone(GPIO_PIN, 1000);
	// Delay 5 seconds
	delay(5000);
	// Stop the tone
	noTone(GPIO_PIN);
	// Delay 5 seconds
	delay(5000);
}

Notes

• PWM_OUTPUT mode uses the internal PWM hardware of the BCM283x SoC.
  The available PWM pins are the followings: