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.
beep.cpp@5:372aa7360db7, 2014-02-22 (annotated)
- Committer:
- joe4465
- Date:
- Sat Feb 22 13:11:02 2014 +0000
- Revision:
- 5:372aa7360db7
- Parent:
- 4:d8e14429a95f
commit before library update
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| dreschpe | 0:18e4a9c978ec | 1 | #include "beep.h" |
| dreschpe | 0:18e4a9c978ec | 2 | #include "mbed.h" |
| dreschpe | 0:18e4a9c978ec | 3 | |
| dreschpe | 2:a34405c20cf5 | 4 | /** class to make sound with a buzzer, based on a PwmOut |
| dreschpe | 3:5a8242af60ba | 5 | * The class use a timeout to switch off the sound - it is not blocking while making noise |
| dreschpe | 3:5a8242af60ba | 6 | * |
| dreschpe | 3:5a8242af60ba | 7 | * Example: |
| dreschpe | 3:5a8242af60ba | 8 | * @code |
| dreschpe | 3:5a8242af60ba | 9 | * // Beep with 1Khz for 0.5 seconds |
| dreschpe | 3:5a8242af60ba | 10 | * #include "mbed.h" |
| dreschpe | 3:5a8242af60ba | 11 | * #include "beep.h" |
| dreschpe | 3:5a8242af60ba | 12 | * |
| dreschpe | 3:5a8242af60ba | 13 | * Beep buzzer(p21); |
| dreschpe | 3:5a8242af60ba | 14 | * |
| dreschpe | 3:5a8242af60ba | 15 | * int main() { |
| dreschpe | 3:5a8242af60ba | 16 | * ... |
| dreschpe | 3:5a8242af60ba | 17 | * buzzer.beep(1000,0.5); |
| dreschpe | 3:5a8242af60ba | 18 | * ... |
| dreschpe | 3:5a8242af60ba | 19 | * } |
| dreschpe | 3:5a8242af60ba | 20 | * @endcode |
| dreschpe | 3:5a8242af60ba | 21 | */ |
| dreschpe | 2:a34405c20cf5 | 22 | |
| dreschpe | 0:18e4a9c978ec | 23 | using namespace mbed; |
| dreschpe | 3:5a8242af60ba | 24 | // constructor |
| dreschpe | 2:a34405c20cf5 | 25 | /** Create a Beep object connected to the specified PwmOut pin |
| dreschpe | 3:5a8242af60ba | 26 | * |
| dreschpe | 3:5a8242af60ba | 27 | * @param pin PwmOut pin to connect to |
| dreschpe | 3:5a8242af60ba | 28 | */ |
| dreschpe | 2:a34405c20cf5 | 29 | |
| joe4465 | 5:372aa7360db7 | 30 | Beep::Beep(PinName pin) : _digitalOut(pin) { |
| joe4465 | 5:372aa7360db7 | 31 | _digitalOut.write(0); // after creating it have to be off |
| dreschpe | 0:18e4a9c978ec | 32 | } |
| dreschpe | 0:18e4a9c978ec | 33 | |
| dreschpe | 2:a34405c20cf5 | 34 | /** stop the beep instantaneous |
| dreschpe | 3:5a8242af60ba | 35 | * usually not used |
| dreschpe | 3:5a8242af60ba | 36 | */ |
| dreschpe | 0:18e4a9c978ec | 37 | void Beep::nobeep() { |
| joe4465 | 5:372aa7360db7 | 38 | _digitalOut.write(0); |
| dreschpe | 0:18e4a9c978ec | 39 | } |
| dreschpe | 0:18e4a9c978ec | 40 | |
| dreschpe | 2:a34405c20cf5 | 41 | /** Beep with given frequency and duration. |
| dreschpe | 3:5a8242af60ba | 42 | * |
| dreschpe | 3:5a8242af60ba | 43 | * @param frequency - the frequency of the tone in Hz |
| dreschpe | 3:5a8242af60ba | 44 | * @param time - the duration of the tone in seconds |
| dreschpe | 3:5a8242af60ba | 45 | */ |
| dreschpe | 2:a34405c20cf5 | 46 | |
| joe4465 | 5:372aa7360db7 | 47 | void Beep::beep(float time) { |
| dreschpe | 0:18e4a9c978ec | 48 | |
| joe4465 | 5:372aa7360db7 | 49 | _digitalOut.write(1); |
| dreschpe | 0:18e4a9c978ec | 50 | toff.attach(this,&Beep::nobeep, time); // time to off |
| dreschpe | 0:18e4a9c978ec | 51 | } |
| dreschpe | 0:18e4a9c978ec | 52 | |
| dreschpe | 0:18e4a9c978ec | 53 | |
| dreschpe | 0:18e4a9c978ec | 54 | |
| dreschpe | 0:18e4a9c978ec | 55 |