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Materiais

•  09 Botões de toque;
•  09 Resistores de 100 Ohms;
•  08 Leds;
•  1 auto falante;

Circuito eletrônico

Código fonte 

#define SPK 13 #define PLAYBACK_BTN 12 #define BUFFERSIZE 160 int keys[] = {2,3,4,5,6,7,8,9}; int tones[] = {2093,1976,1760,1568,1397,1319,1175,1047}; // melhor tom //int tones[] = {1047,1175,1319,1397,1568,1760,1976,2093}; char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' }; //int tones[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956 }; int length = sizeof keys/sizeof *keys; // for recording int count = 0; int recorder[BUFFERSIZE]; unsigned long interval[BUFFERSIZE]; unsigned long pauseInterval[BUFFERSIZE]; void setup() { pinMode(SPK,OUTPUT); pinMode(PLAYBACK_BTN,INPUT); for(int i=0; i<length; i++){ pinMode(keys[i],INPUT); } } void loop() { unsigned long startTime; static unsigned long pauseTime; static int playback_btn=0; int lastState = LOW; // prevent buffer overflow if(count>=BUFFERSIZE) count=0; // playback button if(digitalRead(PLAYBACK_BTN)==HIGH){ playback(); playback_btn=1; } // for each keyboard key for(int i=0; i<length; i++){ //startTime = micros(); startTime = millis(); while(digitalRead(keys[i])==HIGH){ if(playback_btn){ // reset count after playback playback_btn = 0; count=0; } recorder[count]=i; tone(SPK,tones[i]); delay(200); // debounce lastState=HIGH; } if(lastState==HIGH){ lastState=LOW; noTone(SPK); interval[count]=millis()-startTime; if(count) pauseInterval[count-1]=millis()-pauseTime; pauseTime=millis(); count++; } } } void playback(){ int index, key; for(int i=0; i<length; i++){ pinMode(keys[i],OUTPUT); } for(int i=0; i<count; i++){ index = recorder[i]; key = keys[index]; digitalWrite(key,HIGH); tone(SPK,tones[index]); delay(interval[i]); digitalWrite(key,LOW); noTone(SPK); delay(pauseInterval[i]); } for(int i=0; i<length; i++){ pinMode(keys[i],INPUT); } }