arduino 有源 蜂鸣器_Arduino教程——蜂鸣器发声
int speakerPin = 9;int length = 15; // the number of noteschar notes[] = "ccggaagffeeddc "; // a space represents a restint beats[] = { 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 4 };int tempo = 300;vo...
