//Melody - Will play a melody //Constants#define speakerPin 14 //Pin the speaker is connected to#define noteLength 300 //How long the notes last#define A 440 //Frequency of lower A (lowest playable note) in Hzfloat* glob; //to hold a pointer so I can pass an array from setup() to loop()int numNotes; //how many notes there are in the melody. Also needs to be passed from setup() to loop()//Functions:float switcher(int m, float di) { //convert the multiplier to a frequency float ret = A + di * m; //return value is lower A + the difference per note * the note multiplier return ret;}float switchNote(char* x, float d) { //I am sure there's a better way to do this int multi; if (strcmp(x, "An") == 0) { multi = 0; // the multiplier for this letter pair } else if (strcmp(x, "As") == 0) { multi = 1; } else if (strcmp(x, "Bb") == 0) { multi = 1; } else if (strcmp(x, "Bn") == 0) { multi = 2; } else if (strcmp(x, "Bs") == 0) { multi = 3; } else if (strcmp(x, "Cb") == 0) { multi = 2; } else if (strcmp(x, "Cn") == 0) { multi = 3; } else if (strcmp(x, "Cs") == 0) { multi = 4; } else if (strcmp(x, "Db") == 0) { multi = 4; } else if (strcmp(x, "Dn") == 0) { multi = 5; } else if (strcmp(x, "Ds") == 0) { multi = 6; } else if (strcmp(x, "Eb") == 0) { multi = 6; } else if (strcmp(x, "En") == 0) { multi = 7; } else if (strcmp(x, "Es") == 0) { multi = 8; } else if (strcmp(x, "Fb") == 0) { multi = 7; } else if (strcmp(x, "Fn") == 0) { multi = 8; } else if (strcmp(x, "Fs") == 0) { multi = 9; } else if (strcmp(x, "Gb") == 0) { multi = 9; } else if (strcmp(x, "Gn") == 0) { multi = 10; } else if (strcmp(x, "Gs") == 0) { multi = 11; } else if (strcmp(x, "Ab") == 0) { multi = 11; } else { multi = random(0, 12); //tone(speakerPin, 880, 500); //delay(500); } Serial.print("multi="); Serial.println(multi); return switcher(multi, d); //Calculate and return the frequency}//The standard functionsvoid setup() { randomSeed(analogRead(0)); pinMode(speakerPin, OUTPUT); Serial.begin(9600); //The melody to play goes here char melody[] = "Cn,Gn,En,An,Bn,As,An,Gn,En,Gn,An,Fn,Gn,En,Cn,Dn,Bn,"; //Must end with a comma, so length is multiple of 3 //array for the frequencies numNotes = strlen(melody) / 3; float* freqs = (float*) malloc(numNotes*sizeof(float)); //C //float* freqs = new float [numNotes]; // C++ float diff = A/12; //find note interval in Hz so it can be passed down through the loop for(int i=0; i<numNotes; i++) { //separate the melody out into notes char currNote[2]; currNote[0] = melody[3*i]; currNote[1] = melody[(3*i)+1]; freqs[i] = switchNote(currNote, diff); //convert the note to a frequency and store it in freqs } glob = freqs;}void loop() { for(int i=0; i<numNotes; i++) { tone(speakerPin, glob[i], noteLength); delay(500); } delay(750);}