Build Instructions

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• 1

  Step 1

  Breadboarding the setup

• 2

  Step 2

  Uploading the program - this is the final version that plays all sounds then restarts

  Library files are from here  https://github.com/TMRh20/TMRpcm/wiki

  Note WAV files are 8bit and should be less than 20K/sec samples - I used Audacity Portable

  This is modified code originally from APC mag in Australia - the article goes into great detail 

  Thanks Darren Yates  http://apcmag.com/arduino-project-5-digital-audio-...

  // ---------------------------------------------------------------------------------
  // DO NOT USE CLASS-10 CARDS on this project - they're too fast to operate using SPI
  // ---------------------------------------------------------------------------------
  
  #include <SD.h>
  #include <TMRpcm.h>
  TMRpcm tmrpcm;
  
  File root;
  File entry;
  
  // ---------------------------------------------------------------------------------
  // set chipSelect to '10' if using the $2 SD card module or '4' if using the
  // Ethernet shield's microSD card instead.
  const int chipSelect = 10;
  // ---------------------------------------------------------------------------------
  
  const int oldCard = SPI_HALF_SPEED;
  const int newCard = SPI_QUARTER_SPEED;
  
  // ---------------------------------------------------------------------------------
  // set cardType to 'oldCard' if using an old SD card (more than a few years old) or
  // to 'newCard' if using a newly-purchase Class-4 card.
  int cardType = oldCard;
  // ---------------------------------------------------------------------------------
  
  int wasPlaying = 0;
  int inSwitch = 7;
  int finished = 0;
  int start = 0;
  int pauseOn = 0;
  int trigPin = 4;
  int echoPin = 5;
  
  void setup() {
  pinMode(trigPin, OUTPUT); //for HC-SR04
  pinMode(echoPin, INPUT); //for HC-SR04
  Serial.begin(9600);
  Serial.print("\nInitializing SD card...");
  pinMode(chipSelect, OUTPUT);
  if (!SD.begin(chipSelect,cardType)) {
  Serial.println("failed!");
  return;
  }
  Serial.println("done.");
  
  tmrpcm.speakerPin = 9; //Pin9 for audio output
  
  pinMode(inSwitch,INPUT_PULLUP); //Audio Test switch
  // digitalWrite(inSwitch,HIGH);
  
  root = SD.open("/");
  }
  
  void loop(void) {
  long duration, distance; //
  digitalWrite(trigPin, LOW); // HC-SR04 setup
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(20);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH); //Get ping time
  Serial.println(duration);
  boolean btnState = digitalRead(inSwitch); //Check Audio Test switch
  if(btnState == LOW){ //manual trigger on pin 7 - bring low
  playNext();
  delay(100);
  }
  if ((duration < 8000) && (duration > 3000)) { // Trigger set for 40cm - 120cm
  playNext();
  delay(5000); //Delay between each sound file
  }
  delay(1000); //Check ping sensor every second
  }
  
  
  void playNext() { //play next track function
  entry = root.openNextFile();
  Serial.println(entry);
  if (entry) {
  entry.close();
  tmrpcm.play(entry.name());
  wasPlaying = 1;
  } else {
  if (wasPlaying == 1) {
  wasPlaying = 0;
  root.rewindDirectory();
  entry = root.openNextFile();
  Serial.println(entry);
  entry.close();
  tmrpcm.play(entry.name());
  }
  }
  }

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