diff --git a/door-sensor/door-sensor.ino b/door-sensor/door-sensor.ino
index fe6141a..bf8244a 100644
--- a/door-sensor/door-sensor.ino
+++ b/door-sensor/door-sensor.ino
@@ -1,25 +1,22 @@
 #include <IRremote.hpp>
-#include "pitches.h"
+#include "melody.h"
+
 #define IR_RECEIVE_PIN 7
-#include <TimerFreeTone.h>
-#define TONE_PIN 8
+
+
 
 const int DOOR_SENSOR_PIN = 13;
 
 
 
-// notes in the melody:
-int melody[] = {
-  NOTE_C4, NOTE_G3, NOTE_G3, NOTE_A3, NOTE_G3, 0, NOTE_B3, NOTE_C4
-};
+/* Connections:
+*  Door Sensor: Gnd & 13
+*  Buzzer: Gnd & 8
+*  Led Receptor: 7 & Gnd & 5V
+*/
+
 
-// note durations: 4 = quarter note, 8 = eighth note, etc.:
-int noteDurations[] = {
-  4, 8, 8, 4, 4, 4, 4, 4
-};
 
-int melody2[] = { 262, 196, 196, 220, 196, 0, 247, 262 };
-int duration[] = { 250, 125, 125, 250, 250, 250, 250, 250 };
 
 int currentDoorState; // current state of door sensor
 int lastDoorState;    // previous state of door sensor
@@ -32,6 +29,10 @@ void setup()
   pinMode(DOOR_SENSOR_PIN, INPUT_PULLUP);
 
   currentDoorState = digitalRead(DOOR_SENSOR_PIN); // read state
+
+  if(useTimerFreeTone){
+    Serial.println("configure to use timer free tone");
+  }
 }
 int lastCmd;
 unsigned long lastTime;
@@ -85,27 +86,6 @@ void handleDoor(){
   }
 }
 
-void playTone(){
-  // // iterate over the notes of the melody:
-  // for (int thisNote = 0; thisNote < 8; thisNote++) {
-
-  //   // to calculate the note duration, take one second divided by the note type.
-  //   //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
-  //   int noteDuration = 1000 / noteDurations[thisNote];
-  //   tone(8, melody[thisNote], noteDuration);
-
-  //   // to distinguish the notes, set a minimum time between them.
-  //   // the note's duration + 30% seems to work well:
-  //   int pauseBetweenNotes = noteDuration * 1.30;
-  //   delay(pauseBetweenNotes);
-  //   // stop the tone playing:
-  //   noTone(8);
-  // }
-
-  for (int thisNote = 0; thisNote < 8; thisNote++) { // Loop through the notes in the array.
-    TimerFreeTone(TONE_PIN, melody2[thisNote], duration[thisNote]); // Play thisNote for duration.
-    delay(50); // Short delay between notes.
-  }
-}
+
 
 
diff --git a/door-sensor/melody.h b/door-sensor/melody.h
new file mode 100644
index 0000000..f4f2a93
--- /dev/null
+++ b/door-sensor/melody.h
@@ -0,0 +1,50 @@
+#include "pitches.h"
+#include <TimerFreeTone.h>
+
+// notes in the melody:
+int melody[] = {
+  NOTE_C4, NOTE_G3, NOTE_G3, NOTE_A3, NOTE_G3, 0, NOTE_B3, NOTE_C4
+};
+
+// note durations: 4 = quarter note, 8 = eighth note, etc.:
+int noteDurations[] = {
+  4, 8, 8, 4, 4, 4, 4, 4
+};
+
+int melody2[] = { 262, 196, 196, 220, 196, 0, 247, 262 };
+int duration[] = { 250, 125, 125, 250, 250, 250, 250, 250 };
+
+const bool useTimerFreeTone =true;
+
+#define TONE_PIN 8
+
+
+
+void playTone(){
+  if(useTimerFreeTone)
+  {
+    for (int thisNote = 0; thisNote < 8; thisNote++) { // Loop through the notes in the array.
+      TimerFreeTone(TONE_PIN, melody2[thisNote], duration[thisNote]); // Play thisNote for duration.
+      delay(50); // Short delay between notes.
+    }
+    return;
+  }
+
+  // iterate over the notes of the melody:
+  for (int thisNote = 0; thisNote < 8; thisNote++) {
+
+    // to calculate the note duration, take one second divided by the note type.
+    //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
+    int noteDuration = 1000 / noteDurations[thisNote];
+    tone(TONE_PIN, melody[thisNote], noteDuration);
+
+    // to distinguish the notes, set a minimum time between them.
+    // the note's duration + 30% seems to work well:
+    int pauseBetweenNotes = noteDuration * 1.30;
+    delay(pauseBetweenNotes);
+    // stop the tone playing:
+    noTone(TONE_PIN);
+  }
+
+  
+}
\ No newline at end of file