Added Combo Lock Code

Firmware/Combo/Combo.ino

@@ -0,0 +1,87 @@
+/* 
+ Make the Simon Says Game a 4-hole Ocarina (Like in the legend of zelda)
+ 
+ Prof Mike Soltys
+ University of Colorado
+ 1/28/2014
+ */
+
+
+// Define the button, LED, and buzzer pins (this is standard for all Simon Says games
+// I've labeled mine UL for Upper Left, LR for Lower Left and so on.  
+const int led_UL = 10; //Red
+const int led_UR = 3; //Green
+const int led_LL = 13; //Blue
+const int led_LR = 5; //Yellow
+
+const int but_UL = 9;
+const int but_UR = 2;
+const int but_LL = 12;
+const int but_LR = 6;
+
+const int BUZZER1 = 4;
+const int BUZZER2 = 7;
+
+void setup() {
+  //Setup hardware inputs/outputs. 
+  //Enable pull ups on inputs
+  pinMode(but_UL, INPUT_PULLUP);
+  pinMode(but_UR, INPUT_PULLUP);
+  pinMode(but_LL, INPUT_PULLUP);
+  pinMode(but_LR, INPUT_PULLUP);
+
+  pinMode(led_UL, OUTPUT);
+  pinMode(led_UR, OUTPUT);
+  pinMode(led_LL, OUTPUT);
+  pinMode(led_LR, OUTPUT);
+
+  pinMode(BUZZER1, OUTPUT);
+  pinMode(BUZZER2, OUTPUT);
+}
+
+void loop() {
+  // keep doing this over and over again.
+  // I will start with the most buttons pressed, and move on to the least buttons pressed
+  // for any combination, i'll play a matching note and light up the LEDs that aren't being pressed.
+
+  // Start with all buttons pressed - C4 - 262
+  int Button=ButtonWait();
+  delay(100); 
+  if (Button == 1){
+    digitalWrite(led_UL, HIGH);
+    Button=ButtonWait();
+    if (Button==2){
+    digitalWrite(led_UR, HIGH);  
+    }
+  }
+  delay(1000);
+  digitalWrite(led_UR, LOW);
+  digitalWrite(led_UL, LOW);
+  digitalWrite(led_LL, LOW);  
+  digitalWrite(led_LR, LOW);     
+}
+
+int ButtonWait(void){
+while(1 == 1){
+    if(digitalRead(but_UL) == 0){
+      while (digitalRead(but_UL) != 0) ;
+      delay(10);
+      return 1;
+    }
+    else if(digitalRead(but_UR) == 0){
+      while (digitalRead(but_UR) != 0) ; 
+      delay(10);
+      return 2;
+    }       
+    else if(digitalRead(but_LL) == 0){
+      while (digitalRead(but_LL) != 0) ;
+      delay(10);
+      return 3;
+    }  
+    else if(digitalRead(but_LR) == 0){
+      while (digitalRead(but_LR) != 0) ;
+      delay(10);
+      return 4;
+    }
+  }
+}

Firmware/SIMON_3_BUZZER/SIMON_3_BUZZER.ino

@@ -36,8 +36,9 @@ int buzzer_2 = 7;
 void setup()   {           
   pinMode(ledPin, OUTPUT);     
   
-  digitalWrite(buttonPin, HIGH);
+  // Note: For the way the circuit is setup, INPUT_PULLUP will result much more
-  pinMode(buttonPin, INPUT);     
+  // stability than INPUT
+  pinMode(buttonPin, INPUT_PULLUP);     
 
   pinMode(buzzer_1, OUTPUT);
   pinMode(buzzer_2, OUTPUT);
@@ -51,14 +52,21 @@ void loop()
   int button_state = digitalRead(buttonPin);
 
   
-  if(button_state == 1){
+  if(button_state == 0){
     
   digitalWrite(ledPin, HIGH);   // set the LED on
   delay(1000);                  // wait for a second
   digitalWrite(ledPin, LOW);    // set the LED off
   
   // Call the "buzz()" funtion. See below to know what this does.
-  buzz();
+  tone(buzzer_1,400,500);
+  delay(1000);
+  tone(buzzer_2,600,500);
+  delay(1000);
+  tone(buzzer_1,400,500);
+  delay(250);
+  tone(buzzer_2,600,500);
+  //tone(buzzer_1,500,100);
   
   }