diff --git a/turntable-sensors/turntable-sensors.ino b/turntable-sensors/turntable-sensors.ino
index 520f73d..bd05bc2 100644
--- a/turntable-sensors/turntable-sensors.ino
+++ b/turntable-sensors/turntable-sensors.ino
@@ -1,33 +1,49 @@
+#include <fifo.h>
+#include <midi_messages.h>
+#include <midi_serialization.h>
+#include <usbboard.h>
+#include <usbconfig.h>
+#include <usbdrv.h>
+#include <usbmidi.h>
+
+
 
 #include <Wire.h>
 #include <VL53L0X.h>
 
 // IR SENSORS
 
-#define XSHUT_pin4 8 //not required for address change
-#define XSHUT_pin3 9
-#define XSHUT_pin2 10
-#define XSHUT_pin1 11
+// #define XSHUT_pin4 8 //not required for address change
+#define XSHUT_pin3 8
+#define XSHUT_pin2 9
+#define XSHUT_pin1 10
 
 //ADDRESS_DEFAULT 0b0101001 or 41
-#define Sensor4_newAddress 41  //not required address change
-#define Sensor3_newAddress 42
-#define Sensor2_newAddress 43
-#define Sensor1_newAddress 44
+// #define Sensor4_newAddress 41  //not required address change
+#define Sensor3_newAddress 41
+#define Sensor2_newAddress 42
+#define Sensor1_newAddress 43
 
 // IR sensors
-VL53L0X sensor4;
 VL53L0X sensor3;
 VL53L0X sensor2;
 VL53L0X sensor1;
 
-
 // bool last_sensor1_state = 0;
 // bool last_sensor2_state = 0;
 // bool last_sensor3_state = 0;
-// bool last_sensor4_state = 0;
+const int trackCount = 3;
+int tracksUp[trackCount];
+
+void sendNote(uint8_t channel, uint8_t note, uint8_t velocity) {
+	USBMIDI.write((velocity != 0 ? 0x90 : 0x80) | (channel & 0xf));
+	USBMIDI.write(note & 0x7f);
+	USBMIDI.write(velocity &0x7f);
+}
+
 
 void setup() {
+  Serial.println("Setup");
   Serial.begin(115200);
   // Set the maximum speed in steps per second:
 
@@ -38,12 +54,10 @@ void setup() {
   pinMode(XSHUT_pin1, OUTPUT);
   pinMode(XSHUT_pin2, OUTPUT);
   pinMode(XSHUT_pin3, OUTPUT);
-  pinMode(XSHUT_pin4, OUTPUT);
   
   digitalWrite(XSHUT_pin1, LOW);
   digitalWrite(XSHUT_pin2, LOW);
   digitalWrite(XSHUT_pin3, LOW);
-  digitalWrite(XSHUT_pin4, LOW);
 
   Wire.begin();
 
@@ -64,16 +78,10 @@ void setup() {
   sensor3.setAddress(Sensor3_newAddress);
   delay(10);
 
-  pinMode(XSHUT_pin4, INPUT);
-  sensor4.init();
-  sensor4.setAddress(Sensor4_newAddress);
-  delay(10);
-
 
   sensor1.setTimeout(0);
   sensor2.setTimeout(0);
   sensor3.setTimeout(0);
-  sensor4.setTimeout(0);
 
   // // if (!sensor.init())
   // // {
@@ -83,33 +91,75 @@ void setup() {
   sensor1.startContinuous();
   sensor2.startContinuous();
   sensor3.startContinuous();
-  sensor4.startContinuous();
+
+  for (int i=0; i<trackCount; ++i) {
+		tracksUp[i] = 0;
+	}
 }
 
 void loop() {
-  
+    // Serial.println('loop');
+
+    //Handle USB communication
+    USBMIDI.poll();
+
+    while (USBMIDI.available()) {
+      // We must read entire available data, so in case we receive incoming
+      // MIDI data, the host wouldn't get stuck.
+      u8 b = USBMIDI.read();
+    }
+
     int state1 = sensor1.readRangeContinuousMillimeters();
-    Serial.print("s1 : ");
-    Serial.print(state1);
-    Serial.print(" | ");
+    // Serial.print("s1 : ");
+    // Serial.print(state1);
+    // Serial.print(" | ");
+    if (state1 > 0 && tracksUp[0] == 0)
+    {
+      sendNote(0, 64, 127);
+      tracksUp[0] = 1;
+    }
+    else
+    {
+      tracksUp[0] = 0;
+    }
+    
     
     int state2 = sensor2.readRangeContinuousMillimeters();
-    Serial.print("s2 : ");
-    Serial.print(state2);
-    Serial.print(" | ");
+    // Serial.print("s2 : ");
+    // Serial.print(state2);
+    // Serial.print(" | ");
+    if (state2 > 0 && tracksUp[1] == 0)
+    {
+      sendNote(0, 65, 127);
+      tracksUp[1] = 1;
+    }
+    else
+    {
+      tracksUp[1] = 0;
+    }
+
     
     int state3 = sensor3.readRangeContinuousMillimeters();
-    Serial.print("s3 : ");
-    Serial.print(state3);
-    Serial.print(" | ");
+    // Serial.print("s3 : ");
+    // Serial.println(state3);
+    // Serial.print(" | ");
+    if (state3 > 0 && tracksUp[2] == 0)
+    {
+      sendNote(0, 66, 127);
+      tracksUp[2] = 1;
+    }
+    else
+    {
+      tracksUp[2] = 0;
+    }
 
-    int state4 = sensor4.readRangeContinuousMillimeters();
-    Serial.print("s4 : ");
-    Serial.println(state4);
-  
   
   // if (sensor1.timeoutOccurred()) { Serial.print(" TIMEOUT"); }
   // if (sensor2.timeoutOccurred()) { Serial.print(" TIMEOUT"); }
   // if (sensor3.timeoutOccurred()) { Serial.print(" TIMEOUT"); }
-  // if (sensor4.timeoutOccurred()) { Serial.print(" TIMEOUT"); }
+
+
+	// Flush the output.
+	USBMIDI.flush();
+
 }
\ No newline at end of file