Diff: Piezo.h

Revision:

3:6ecb75a2675c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Piezo.h	Thu Dec 16 16:20:11 2021 +0000
@@ -0,0 +1,81 @@
+#ifndef PIEZO
+#define PIEZO
+
+#include "mbed.h"
+
+/** Class for the PWM Piezo speaker.
+ *  This class is using PWM to make sounds with piezo speaker.
+ *  Currently tested with LPC1768.\n\n
+ *
+ *
+ *                                      Writen by: Jan Crha (TeaPack_CZ), 2016.
+ *
+ *  Last modified: 2016-10-01
+ *
+ *  Example:
+ *  @code
+ *  #include "mbed.h"
+ *  #include "Piezo.h"
+ *
+ *  Piezo PS(p21);
+ *
+ *  int main(){
+ *      int playTime = 120;
+ *
+ *      for(int i=0; i<2; i++)
+ *      {
+ *          PS.play(466.16,playTime);
+ *          wait_ms(playTime);
+ *          PS.play(415.30,playTime);
+ *          wait_ms(playTime);
+ *    
+ *          PS.play(466.16,playTime);
+ *          wait_ms(playTime);
+ *          PS.play(349.23,playTime);
+ *          wait_ms(playTime);
+ *    
+ *          PS.play(277.18,playTime/2);
+ *          wait_ms(playTime/2);
+ *          PS.play(349.23,playTime/2);
+ *          wait_ms(playTime/2);
+ *          wait_ms(playTime);
+ *          PS.play(233.08,playTime/2);
+ *          wait_ms(playTime/2);
+ *    
+ *          wait_ms(playTime*4);
+ *      }
+ *  }
+ * @endcode
+ */
+
+class Piezo
+{
+public:
+    
+    /** Constructor, Pin must be PWM capable*/
+    Piezo(PinName Pwmout);
+    
+    /** Blocking function for playing sound of given frequency and
+     *       duration in ms
+     */
+    void play(float, int);
+    
+    /** Nonblocking function for playing sound of given frequency and 
+     *      duration in ms
+     */
+    void playAsync(float, int);
+    
+    /** Function for stopping all sounds */
+    void stop();
+    
+private:
+    PwmOut _pwm;
+    Ticker _timer;
+
+    float Period;
+
+    float min_freq;
+    float max_freq;
+};
+
+#endif
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