Rob Toulson / Mbed 2 deprecated PE_04-07_OrangesAndLemons

by Rob Toulson and Tim Wilmshurst from textbook "Fast and Effective Embedded Systems Design: Applying the ARM mbed"

Dependencies:   mbed

main.cpp

Committer:
robt
Date:
2012-08-31
Revision:
0:1b9092423ff2

File content as of revision 0:1b9092423ff2:

/*Program Example 4.7: Plays the tune "Oranges and Lemons" on a piezo buzzer, using PWM
                                                                          */
#include "mbed.h"
PwmOut buzzer(p21);

//frequency array
float frequency[]= {659,554,659,554,440,494,554,587,494,659,554,440};
float beat[]= {1,1,1,1,1,0.5,0.5,1,1,1,1,2};             //beat array
int main()
{
    while (1) {
        for (int i=0; i<=11; i++) {
            buzzer.period(1/(2*frequency[i]));                 // set PWM period
            buzzer=0.5;                                        // set duty cycle
            wait(0.4*beat[i]);                                 // hold for beat period
        }
    }
}