Diff: main.cpp

Revision:

0:1b9092423ff2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Aug 31 16:08:26 2012 +0000
@@ -0,0 +1,19 @@
+/*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
+        }
+    }
+}
+