This for the Final Prototype for the Atelier class. Basically it's trigger with a split ground wire and when the circuit is complete it allows the track in the code to play.

Mad Samurai Beat Machine

/*
Mad Samurai Beat Machine 

Group members: Tristan Santos, Harit Lad, William Selviz 
DIGF-2004-001 

This is the Processing code that talks to Arduino via Arduino Firmata. 
The code uses two libraries, Minim and Arduino Frimata, and allows us to use the Arduino
as an input and the laptop (Processing) as a output.

Reference: 
Used the example of PlayAFile from Minim Library; 
  http://code.compartmental.net/minim/  
    >Examples 
      >Minim
        >Basic 
          >PlayAFile
Uses parts of the Arduino Firmata Playground: 
  https://playground.arduino.cc/Interfacing/ProcesssHackForFirmata
    This code can be found from the examples under; 
      > Arduino (Firmata)
        > arduino_input
    The one I used was the one from the website itself 

*/ 

//Calling the Libraries 
import ddf.minim.*; 
import processing.serial.*;
import cc.arduino.*;


Arduino arduino; // Call Arduino 
Minim minim; // Call Minim Library 
AudioPlayer Samurai; // Call Audioplayer 

int mad = 7; // digital pin 7 (the one we are using 

color off = color(4, 79, 111); 
color on = color(84, 145, 158);
// These are just fill of color to make sure things are working 

void setup() {
  size(470, 280);
  arduino = new Arduino(this, "/dev/cu.usbmodem1411", 57600); // Calling in the arduino and delcaring pin and speed of reading 
  
  minim = new Minim(this); // Calling in Minim Library 
  Samurai = minim.loadFile("Frank Ocean - Chanel.mp3"); // Telling Minim to use the file in the brackets  

  //for (int i = 0; i <= 13; i++)
    arduino.pinMode(mad, Arduino.INPUT); // Telling the Arduino that we want to use pinMode and declaring the pin as well as INPUT
    
}

void draw() {
  background(off);
  stroke(on);

  //for (int i = 0; i <= 13; i++) {
    if (arduino.digitalRead(mad) == Arduino.HIGH) { // If the digital pin is reading High (activate); 
      fill(on); // Then fill in the the colour 
      Samurai.loop(); //Loop the track 
      println("off"); // And print off 
    }else{ // If read low 
      fill(off); // Then draw outline 
      Samurai.play(); // Play the track 
      println("on"); // print on 
    rect(420 - mad * 30, 30, 20, 20); // This is the visual 
    }
}