oranges-and-lemons-bells-of-st-clements

#include "mbed.h"
#include "platform/mbed_thread.h"

PwmOut buzzer(D3);

//frequency array
float frequency[]={659 , 554 ,659 , 554 , 440 , 494 , 554 , 587 , 494 , 659 ,554 ,440};
//bloat array
float beat[]={1 , 1 , 1 , 1 , 1 , 0.5 , 0.5 , 1 , 1 , 1 , 1 , 2};

int main()
{
    for (int i = 0; i <= 11; i++)
    {
        //set PWM  period - use half the frequency to get the right sound
        buzzer.period((float)1.0/(2*frequency[i]));
        //set duty cycle
        buzzer = 0.5;
        //hold for beat period
        wait((float)0.4*beat[i]);   
    }
    buzzer = 0; //turn buzzer off
    while(1); //hold code
}