hobbielektronika / Mbed 2 deprecated 03_pwm_music

Pulse Width Modulation

Dependencies:   mbed

Fork of 03_pwm_music by Istvan Cserny

main.cpp@0:7d30529dcdc6, 2015-10-21 (annotated)

Committer:
icserny
Date:
Wed Oct 21 11:51:16 2015 +0000
Revision:
0:7d30529dcdc6
First version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
icserny 0:7d30529dcdc6 1 /** 03_pwm_music
icserny 0:7d30529dcdc6 2 * This program plays the Oranges and Lemons music
icserny 0:7d30529dcdc6 3 * on a piezo buzzer tied between D3 (PTA12) pin and GND
icserny 0:7d30529dcdc6 4 *
icserny 0:7d30529dcdc6 5 * Hardware requirements:
icserny 0:7d30529dcdc6 6 * - FRDM-KL25Z board
icserny 0:7d30529dcdc6 7 * - Piezo buzzer tied between D3 (PTA12) pin and GND
icserny 0:7d30529dcdc6 8 * Note: The + pin of the buzzer connects to D3, of course...
icserny 0:7d30529dcdc6 9 *
icserny 0:7d30529dcdc6 10 * This is an example program borrowed from the
icserny 0:7d30529dcdc6 11 * Pulse Width Modulation section of ARM mbed Course Material
icserny 0:7d30529dcdc6 12 * Authors: Rob Toulson and Tim Wilmshurst
icserny 0:7d30529dcdc6 13 * Link: https://developer.mbed.org/cookbook/Course-Notes
icserny 0:7d30529dcdc6 14 */
icserny 0:7d30529dcdc6 15 #include "mbed.h"
icserny 0:7d30529dcdc6 16 PwmOut buzzer(D3);
icserny 0:7d30529dcdc6 17 float frequency[]={659,554,659,554,550,494,554,587,494,659,554,440}; //frequency array
icserny 0:7d30529dcdc6 18 float beat[]={1,1,1,1,1,0.5,0.5,1,1,1,1,2}; //beat array
icserny 0:7d30529dcdc6 19
icserny 0:7d30529dcdc6 20 int main() {
icserny 0:7d30529dcdc6 21 while (1) {
icserny 0:7d30529dcdc6 22 for (int i=0; i<=11; i++) {
icserny 0:7d30529dcdc6 23 buzzer.period(1/(frequency[i])); // set PWM period
icserny 0:7d30529dcdc6 24 buzzer=0.5; // set duty cycle
icserny 0:7d30529dcdc6 25 wait(0.5*beat[i]); // hold for beat period
icserny 0:7d30529dcdc6 26 }
icserny 0:7d30529dcdc6 27 }
icserny 0:7d30529dcdc6 28 }