Chase Farmer / beep

Make noise with a piezo buzzer. Use a pwm pin.

Dependents:   GliderFuncTest1 DropTest

Fork of beep by Peter Drescher

beep.h@1:ddccf0a4a414, 2011-02-01 (annotated)

Committer:
dreschpe
Date:
Tue Feb 01 19:08:44 2011 +0000
Revision:
1:ddccf0a4a414
Parent:
0:18e4a9c978ec
Child:
3:5a8242af60ba
0.2

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dreschpe 0:18e4a9c978ec 1 #ifndef MBED_BEEP_H
dreschpe 0:18e4a9c978ec 2 #define MBED_BEEP_H
dreschpe 0:18e4a9c978ec 3
dreschpe 0:18e4a9c978ec 4 #include "mbed.h"
dreschpe 0:18e4a9c978ec 5
dreschpe 1:ddccf0a4a414 6 /** class to make sound with a buzzer, based on a PwmOut
dreschpe 1:ddccf0a4a414 7 * The class use a timeout to switch off the sound - it is not blocking while making noise
dreschpe 1:ddccf0a4a414 8 *
dreschpe 1:ddccf0a4a414 9 * Example:
dreschpe 1:ddccf0a4a414 10 * @code
dreschpe 1:ddccf0a4a414 11 * // Beep with 1Khz for 0.5 seconds
dreschpe 1:ddccf0a4a414 12 * #include "mbed.h"
dreschpe 1:ddccf0a4a414 13 * #include "beep.h"
dreschpe 1:ddccf0a4a414 14 *
dreschpe 1:ddccf0a4a414 15 * Beep buzzer(p21);
dreschpe 1:ddccf0a4a414 16 *
dreschpe 1:ddccf0a4a414 17 * int main() {
dreschpe 1:ddccf0a4a414 18 * ...
dreschpe 1:ddccf0a4a414 19 * buzzer.beep(1000,0.5);
dreschpe 1:ddccf0a4a414 20 * ...
dreschpe 1:ddccf0a4a414 21 * }
dreschpe 1:ddccf0a4a414 22 * @endcode
dreschpe 1:ddccf0a4a414 23 */
dreschpe 1:ddccf0a4a414 24
dreschpe 1:ddccf0a4a414 25
dreschpe 0:18e4a9c978ec 26 namespace mbed {
dreschpe 0:18e4a9c978ec 27
dreschpe 0:18e4a9c978ec 28 /* Class: Beep
dreschpe 0:18e4a9c978ec 29 * A class witch uses pwm to controle a beeper to generate sounds.
dreschpe 0:18e4a9c978ec 30 */
dreschpe 0:18e4a9c978ec 31 class Beep {
dreschpe 0:18e4a9c978ec 32
dreschpe 0:18e4a9c978ec 33 public:
dreschpe 0:18e4a9c978ec 34
dreschpe 1:ddccf0a4a414 35 /** Create a Beep object connected to the specified PwmOut pin
dreschpe 1:ddccf0a4a414 36 *
dreschpe 1:ddccf0a4a414 37 * @param pin PwmOut pin to connect to
dreschpe 1:ddccf0a4a414 38 */
dreschpe 0:18e4a9c978ec 39 Beep (PinName pin);
dreschpe 0:18e4a9c978ec 40
dreschpe 1:ddccf0a4a414 41 /** Beep with given frequency and duration.
dreschpe 0:18e4a9c978ec 42 *
dreschpe 1:ddccf0a4a414 43 * @param frequency - the frequency of the tone in Hz
dreschpe 1:ddccf0a4a414 44 * @param time - the duration of the tone in seconds
dreschpe 0:18e4a9c978ec 45 */
dreschpe 0:18e4a9c978ec 46 void beep (float frequency, float time);
dreschpe 0:18e4a9c978ec 47
dreschpe 1:ddccf0a4a414 48 /** stop the beep instantaneous
dreschpe 1:ddccf0a4a414 49 * usually not used
dreschpe 1:ddccf0a4a414 50 */
dreschpe 0:18e4a9c978ec 51 void nobeep();
dreschpe 0:18e4a9c978ec 52
dreschpe 0:18e4a9c978ec 53 private :
dreschpe 0:18e4a9c978ec 54 PwmOut _pwm;
dreschpe 0:18e4a9c978ec 55 Timeout toff;
dreschpe 0:18e4a9c978ec 56 };
dreschpe 0:18e4a9c978ec 57
dreschpe 0:18e4a9c978ec 58 }
dreschpe 0:18e4a9c978ec 59 #endif