Arduino + Ultrasonic sensor + MP3

In this project for Martí Guixé we built a small autonomous device with Arduino that can detect the presence of people with an ultrasonic sensor. It then proceeds to play an MP3 song with a Yampp Industrial III.

Arduino Code:

int val = 0;
int ledPin = 13;
int active = 0;


void setup(){
 Serial.begin(19200);
 pinMode(ledPin, OUTPUT);
}

void loop(){
 val = analogRead(0);
 if(val>200)
 {
  if(active==0)
  {
    Serial.print (1, BYTE);
    digitalWrite(ledPin, HIGH);
    delay(3000);
  }
  active = 1;
 }else{
  active = 0;
  digitalWrite(ledPin, LOW);
  delay(100);
 }

}