jim hamblen / Mbed 2 deprecated speaker_demo_Analog

A class to play notes on a speaker using analog out See https://mbed.org/users/4180_1/notebook/using-a-speaker-for-audio-output/

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Show/hide line numbers main.cpp Source File

main.cpp

00001 #include "mbed.h"
00002 // Audio output demo for speaker
00003 // Speaker Class demo - plays a note on the analog output pin
00004 // 32 data points on one sine wave cycle are precomputed,
00005 // scaled, stored in an array and
00006 // continuously output to the Digital to Analog convertor
00007 
00008 // add Speaker class and PlayNote
00009 // PlayNote args are frequency in hz (<=5000), duration in secs , and volume(0.0..1.0)
00010 #include  "Speaker.h"
00011 
00012 int main()
00013 {
00014 // setup instance of new Speaker class, mySpeaker
00015 // the pin must be the AnalogOut pin - p18
00016     Speaker mySpeaker(p18);
00017     // loops forever playing two notes on speaker using analog samples
00018     while(1) {
00019         mySpeaker.PlayNote(969.0, 0.5, 1.0);
00020         mySpeaker.PlayNote(800.0, 0.5, 1.0);
00021     }
00022 }
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