Joseph Roberts
Make noise with a piezo buzzer. Use a digital out pin.
Fork of
beep
by 
Peter Drescher
This is a simple non blocking library to turn on the pin passed into the constructor for the amount of time specified when calling the beep(float time) function.
I use it to turn on a buzzer but it could be used for anything you need to turn on for a set time.
Revision 0:18e4a9c978ec, committed 2011-02-01
- Comitter:
- dreschpe
- Date:
- Tue Feb 01 18:44:45 2011 +0000
- Child:
- 1:ddccf0a4a414
- Commit message:
Changed in this revision
| beep.c | Show annotated file Show diff for this revision Revisions of this file |
| beep.h | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/beep.c Tue Feb 01 18:44:45 2011 +0000
@@ -0,0 +1,26 @@
+#include "beep.h"
+#include "mbed.h"
+
+using namespace mbed;
+// constructor
+Beep::Beep(PinName pin) : _pwm(pin) {
+ _pwm.write(0.0); // after creating it have to be off
+}
+
+// switch off
+void Beep::nobeep() {
+ _pwm.write(0.0);
+}
+
+
+// beep
+void Beep::beep(float freq, float time) {
+
+ _pwm.period(1.0/freq);
+ _pwm.write(0.5); // 50% duty cycle - beep on
+ toff.attach(this,&Beep::nobeep, time); // time to off
+}
+
+
+
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/beep.h Tue Feb 01 18:44:45 2011 +0000
@@ -0,0 +1,40 @@
+#ifndef MBED_BEEP_H
+#define MBED_BEEP_H
+
+#include "mbed.h"
+
+namespace mbed {
+
+/* Class: Beep
+ * A class witch uses pwm to controle a beeper to generate sounds.
+ */
+class Beep {
+
+public:
+
+ /* Constructor: Beep
+ * Creates a new beeper object.
+ *
+ * Variables:
+ * pin - The pin which is connected to the beeper.
+ */
+ Beep (PinName pin);
+
+ /* Function: beep
+ * Beep with given frequency and duration.
+ *
+ * Variables:
+ * frequency - The frequency to use.
+ * time - The turation to beep.
+ */
+ void beep (float frequency, float time);
+
+ void nobeep();
+
+private :
+ PwmOut _pwm;
+ Timeout toff;
+};
+
+}
+#endif