User:Lieven Van Speybroeck/Prototyping/5-Playback Pattern

Recording music with a pushbutton on Arduino

This program lets you make a record of tones by pushing a pushbutton on Arduino.
Waiting 5 seconds ends the 'record-session'.
By pushing 1 more time, the pattern you recorded will be played back.

int btnPin=2;
int spkrPin=13;
int btnActive=0;
int toneArray[100];
int delayTime=0;
int i=0;
int g=0;

void setup(){
  pinMode(spkrPin, OUTPUT);
  pinMode(btnPin, INPUT);
  Serial.begin(9600);
  tone(spkrPin, 400, 10);
  
}

void loop(){
  while (delayTime < 5000) { // While there's no delay of 5 seconds, keep making a 'record'. 
    Serial.println("Waiting for press...");  
    while (btnActive==LOW){ // While the button is not pressed
        delayTime=(millis()-toneArray[i-1]); // how long is the button left unpressed?
        btnActive=digitalRead(btnPin);
    }
    // ok, pressed now...
    toneArray[i]=millis(); // Put the time of pressing in an array that stores the times
    i++; // add 1 to the array pointer
    
    Serial.println("Waiting for release...");  
    btnActive=digitalRead(btnPin);
    while (btnActive==HIGH){
        btnActive=digitalRead(btnPin);
        tone(spkrPin, 400, 10);
    }
    //ok, released now...
    toneArray[i]=millis(); // Put the time of releasing in the array that stores the times
    i++; // add one to the array pointer
  }
 
// the next loop gets triggered when the button has been left unpressed for 5 seconds and then pressed 1 more time.
// It goes through the whole array with the time values (except for the last 2, these represent the 'play' push)
// and plays the tones and delays based on the array. After it has played 1 tone and the following delay, it
// goes op 2 positions in the array, because for playing one note, you always need 2 time values.
// So the notes form 'couples' of time, where the delay between them is the last value of one note subtracted from the first value of the next note 

  for (g=0; g<(i-2); g=g+2) {
     tone(spkrPin, 400, (toneArray[g+1]-toneArray[g])); // play the tones based on the time values stored in the array
     delay(toneArray[g+2]-toneArray[g+1]); // define the delay based on the time values stored in the array
  }
  
  while(1){}; // 'stop' the program
}