英文教程基本实验使用数字.pdfVIP

PlayaMelodyusingthetone()function

Thiampleshowshowtousethetone()commandtogeneratenotes.Itplaysalittle

melodyyoumayhaveheardbefore.

HardwareRequired

Arduinoboard

8ohmsmallspeaker

100ohmresistor

hook-upwire

Circuit

imagedevelopedusingFritzing.Formorecircuitexamples,seetheFritzingprojectpage

Connectoneterminalofyourspeakertodigitalpin8througha100ohmresistor.

Connecttheotherterminaltoground.

Schematic

clicktheimagetoenlarge

Code

Thecodebelowusesanextrafile,pitches.h.Thisfilecontainsallthepitchvaluesfor

typicalnotes.Forexample,NOTE_C4ismiddleC.NOTE_FS4isFsharp,andso

forth.ThisnotetablewasoriginallywrittenbyBrettHagman,onwhoseworkthe

tone()commandwasbased.Youmayfinditusefulforwheneveryouwanttomake

musicalnotes.

Themainsketchisasfollows:

/*

Melody

Playsamelody

circuit:

*8-ohmspeakerondigitalpin8

created21Jan2010

modified30Aug2011

byTomIgoe

Thiamplecodeisinthepublicdomain.

*/

#includepitches.h

//notesinthemelody:

intmelody[]={

NOTE_C4,NOTE_G3,NOTE_G3,NOTE_A3,NOTE_G3,0,NOTE_B3,

NOTE_C4};

//notedurations:4=quarternote,8=eighthnote,

etc.:

intnoteDurations[]={

4,8,8,4,4,4,4,4};

voidsetup(){

//iterateoverthenotesofthemelody:

for(intthisNote=0;thisNote8;thisNote++){

//tocalculatethenoteduration,takeonesecond

//dividedbythenotetype.

//e.g.quarternote=1000/4,eighthnote=1000/8,

etc.

intnoteDuration=1000/noteDurations[thisNote];

tone(8,melody[thisNote],noteDuration);

//todistinguishthenotes,set