Diff: main.cpp

Revision:

0:7d30529dcdc6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Oct 21 11:51:16 2015 +0000
@@ -0,0 +1,28 @@
+/** 03_pwm_music
+ * This program plays the Oranges and Lemons music
+ * on a piezo buzzer tied between D3 (PTA12) pin and GND
+ *
+ * Hardware requirements:
+ *  - FRDM-KL25Z board
+ *  - Piezo buzzer tied between D3 (PTA12) pin and GND
+ * Note: The + pin of the buzzer connects to D3, of course...
+ *
+ * This is an example program borrowed from the
+ * Pulse Width Modulation section of ARM mbed Course Material
+ * Authors: Rob Toulson and Tim Wilmshurst
+ * Link: https://developer.mbed.org/cookbook/Course-Notes
+ */ 
+#include "mbed.h"
+PwmOut buzzer(D3);
+float frequency[]={659,554,659,554,550,494,554,587,494,659,554,440}; //frequency array
+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/(frequency[i]));    // set PWM period
+            buzzer=0.5;                         // set duty cycle
+            wait(0.5*beat[i]);                  // hold for beat period
+        }
+    }
+}
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