diff --git a/LICENSE b/LICENSE
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new mode 100755
diff --git a/README.md b/README.md
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new mode 100755
diff --git a/main/main.ino b/main/main.ino
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index b6df8b8..02317c1
--- a/main/main.ino
+++ b/main/main.ino
@@ -1,3 +1,4 @@
+#include "ArduinoSTL.h";
 #include "tone.h";
 
 // Miscallaneous inputs/outputs
@@ -6,39 +7,32 @@
 #define ARM_UNARM_BUTTON 3  // button used to arm/unarm
 #define SPKR 12
 
-// Security points
-const int door1 = 4;
-const int door2 = 5;
+using namespace std;
 
-// Configuration parameters
-const String pass        = "113";  // password
-const int securityPoints = 2;      // number of security points
+// Configuration
+const String pass = "113";  // password
 
-const int maxWarnLevel  = 250;  // maximum warnLevel
-const int warnDelayRef  = 300;  // the number to subtract warnLevel from
-const int warnIncrement = 7;    // increment maxLevel by this number
-
-// Program booleans
-bool isArmed    = 1;  // armed status. set to initialize as armed or unarmed
-bool soundAlarm = 0;  // should the program sound the alarm?
-bool unarmButtonDown = 0;  // boolean that prevents unarm right after rearm
-                           // until unarm button is depressed
+const int maxWarnLevel  = 250;  // fastest beeping speed of alarm in ms
+const int warnDelayRef  = 300;  // initial beeping speed of alarm
+const int warnIncrement = 7;    // speed of alarm beeping acceleration
 
 // Program variables
-int warnLevel              = 0;
-int isOpen[securityPoints] = {  // status of security points.
-    false, false};
+bool isArmed         = 1;  // set to initialize as armed or unarmed
+bool soundAlarm      = 0;
+bool unarmButtonDown = 0;  // unarm after arm only until button is released
+bool waitingForPass  = 0;
+
+int warnLevel = 0;  // warn level of alarm
 
-bool waitingForPass = 0;
-String readString;
+String readString;  // temporary string to store serial input on pass entry
 
-unsigned long currentMillis   = millis();
-unsigned long unarmIntTracker = 0;
-unsigned long alarmIntTracker = 0;
-bool flipflopUnarmState       = LOW;
-bool flipflopAlarmState       = LOW;
+unsigned long currentMillis   = millis();  // reference point for timed stuff
+unsigned long unarmIntTracker = 0;    // ref point for unarm timing interval
+unsigned long alarmIntTracker = 0;    // ref point for alarm timing interval
+bool flipflopUnarmState       = LOW;  // unarm led blinking status
+bool flipflopAlarmState       = LOW;  // alarm led and beep blink status
 
-// Melodies
+// Sounds
 int initMelody[]    = {FS4, GS4, AS4, CS5, DS5, FS5};
 int initDurations[] = {100, 100, 100, 100, 100, 100};
 
@@ -52,12 +46,18 @@ int alarmNote = CS5;
 
 int noteDelay = 40;
 
+// Security Point (SP) storage
+vector<String> SPnames;  // names
+vector<int> SPpins;      // pins that a Security Point is connected
+vector<int> SPnormpos;   // normal position of sensor, 0=closed 1=open
+vector<bool> SPisopen;   // whether the point is open or closed
+
 void setup() {
 	Serial.begin(9600);
 
-	// Security points
-	pinMode(door1, INPUT_PULLUP);
-	pinMode(door2, INPUT_PULLUP);
+	// Add security points here
+	addSecurityPoint("Door1", 4, 1);
+	addSecurityPoint("Door2", 5, 1);
 
 	// Misc. inputs/outputs
 	pinMode(ARM_UNARM_BUTTON, INPUT_PULLUP);
@@ -77,6 +77,17 @@ void setup() {
 	}
 }
 
+// Adds a Security Point by adding to each of the vectors.
+void addSecurityPoint(String name, int pin, bool defaultPosition) {
+	SPnames.push_back(name);
+	SPpins.push_back(pin);
+	SPnormpos.push_back(defaultPosition);
+	SPisopen.push_back(false);
+
+	pinMode(pin, INPUT_PULLUP);
+	Serial.println(name + " has been added.");
+}
+
 // Play an array of tones.
 void playMelody(int melodyLength, int *melody, int *noteDur, int noteDelay) {
 	for (int i = 0; i < melodyLength; i++) {
@@ -98,28 +109,27 @@ void flipLed(int ledPin, bool &state) {
 }
 
 void loop() {
-	// - Security Points -
-
-	// door1
-	if (digitalRead(door1) == LOW && isOpen[0] == false) {
-		Serial.println("Door1 has opened.");
-		isOpen[0] = true;
-		if (isArmed == true) soundAlarm = 1;
-	} else if (digitalRead(door1) == HIGH && isOpen[0] == true) {
-		isOpen[0]  = false;
-		soundAlarm = 0;
-		Serial.println("Door1 has closed.");
-	}
+	// - Iterates through all security points -
 
-	// door2
-	if (digitalRead(door2) == LOW && isOpen[1] == false) {
-		Serial.println("Door2 has opened.");
-		isOpen[1] = true;
-		if (isArmed == true) soundAlarm = 1;
-	} else if (digitalRead(door2) == HIGH && isOpen[1] == true) {
-		isOpen[1]  = false;
-		soundAlarm = 0;
-		Serial.println("Door2 has closed.");
+	for (int i = 0; i <= SPnames.size(); i++) {
+		if (digitalRead(SPpins[i]) != SPnormpos[i]) {
+
+			if (SPisopen[i] == false) {
+				SPisopen[i] = true;
+				Serial.println(SPnames[i] + " has opened.");
+			}
+
+			if (isArmed == true && soundAlarm == 0) soundAlarm = 1;
+
+		} else if (digitalRead(SPpins[i]) == SPnormpos[i]) {
+			
+			if (SPisopen[i] == true) {
+				SPisopen[i] = false;
+				Serial.println(SPnames[i] + " has closed.");
+			}
+
+			if (soundAlarm == 1) soundAlarm = 0;
+		}
 	}
 
 	// - Arm/Unarm -
@@ -173,11 +183,13 @@ void loop() {
 	}
 
 	// - Button safety -
+
 	if (digitalRead(ARM_UNARM_BUTTON) == HIGH && unarmButtonDown == 1) {
 		unarmButtonDown = 0;
 	}
 
 	// - Ignore Serial input unless we're waiting for it -
+
 	if (waitingForPass == 0) {
 		while (Serial.available()) { Serial.read(); }
 	}
@@ -214,4 +226,4 @@ void loop() {
 		warnLevel = 0;
 		noTone(SPKR);
 	}
-}
\ No newline at end of file
+}
diff --git a/main/tone.h b/main/tone.h
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