diff --git a/PillTracker/PillTracker/ViewController.swift b/PillTracker/PillTracker/ViewController.swift
index 9733b51..8d226e0 100644
--- a/PillTracker/PillTracker/ViewController.swift
+++ b/PillTracker/PillTracker/ViewController.swift
@@ -23,7 +23,7 @@ class ViewController: UIViewController {
     let totalPills: Int = 16
     var usedPills: Int = 0
     var remainingPills: Int = 0
-    let updateFreq: Float = 2.0
+    let updateFreq: Float = 0.5
     weak var timer: Timer?
 
     override func viewDidLoad() {
diff --git a/embedded/MUX_debug/pp_debug.ino b/embedded/MUX_debug/pp_debug.ino
new file mode 100644
index 0000000..a03d8ea
--- /dev/null
+++ b/embedded/MUX_debug/pp_debug.ino
@@ -0,0 +1,51 @@
+#define MUX_BIT_0 13
+#define MUX_BIT_1 12
+#define MUX_BIT_2 27
+#define MUX_BIT_3 33
+#define MUX_COM 32
+
+#define RAIL_0 14
+#define RAIL_1 15
+
+#define PILL_SENSE 21
+
+#define BATTERY_PIN 35
+
+void setup() {
+  Serial.begin(115200);
+
+  pinMode(MUX_BIT_0, OUTPUT);
+  pinMode(MUX_BIT_1, OUTPUT);
+  pinMode(MUX_BIT_2, OUTPUT);
+  pinMode(MUX_BIT_3, OUTPUT);
+//  pinMode(MUX_COM, INPUT);
+  pinMode(MUX_COM, INPUT_PULLDOWN);
+//  pinMode(MUX_COM, INPUT_PULLUP);
+
+  pinMode(RAIL_0, OUTPUT);
+  pinMode(RAIL_1, OUTPUT);
+
+  digitalWrite(RAIL_0, LOW);
+  digitalWrite(RAIL_1, LOW);
+
+  digitalWrite(MUX_BIT_0, LOW);
+  digitalWrite(MUX_BIT_1, LOW);
+  digitalWrite(MUX_BIT_2, LOW);
+  digitalWrite(MUX_BIT_3, LOW);
+}
+
+
+
+void loop() {
+  
+  digitalWrite(RAIL_0, HIGH);
+  digitalWrite(RAIL_1, LOW);
+  
+  digitalWrite(MUX_BIT_0, LOW);
+  digitalWrite(MUX_BIT_1, LOW);
+  digitalWrite(MUX_BIT_2, LOW);
+  digitalWrite(MUX_BIT_3, LOW);
+  delay(200);
+//  Serial.println(analogRead(MUX_COM));
+  Serial.println(digitalRead(MUX_COM));
+}
diff --git a/embedded/main/main.ino b/embedded/main/main.ino
index a796f6e..2ec24e8 100644
--- a/embedded/main/main.ino
+++ b/embedded/main/main.ino
@@ -26,10 +26,10 @@
 #define MUX_BIT_3 33
 #define MUX_COM 32
 
-#define RAIL_EVEN 15
-#define RAIL_ODD 14
+#define RAIL_0 14
+#define RAIL_1 15
 
-#define PILL_SENSE 21
+#define CASSETTE_SENSE 21
 
 #define BATTERY_PIN 35
 
@@ -86,18 +86,18 @@ void setup() {
   pinMode(MUX_BIT_1, OUTPUT);
   pinMode(MUX_BIT_2, OUTPUT);
   pinMode(MUX_BIT_3, OUTPUT);
-  pinMode(MUX_COM, INPUT_PULLUP);
+  pinMode(MUX_COM, INPUT_PULLDOWN);
 
-  pinMode(RAIL_EVEN, OUTPUT);
-  pinMode(RAIL_ODD, OUTPUT);
+  pinMode(RAIL_0, OUTPUT);
+  pinMode(RAIL_1, OUTPUT);
 
-  pinMode(PILL_SENSE, INPUT_PULLUP);
+  pinMode(CASSETTE_SENSE, INPUT_PULLUP);
   pinMode(BATTERY_PIN, INPUT);
 
   digitalWrite(LED_PIN, LOW);
 
-  digitalWrite(RAIL_EVEN, HIGH);
-  digitalWrite(RAIL_ODD, HIGH);
+  digitalWrite(RAIL_0, LOW);
+  digitalWrite(RAIL_1, LOW);
 
   digitalWrite(MUX_BIT_0, LOW);
   digitalWrite(MUX_BIT_1, LOW);
@@ -126,8 +126,8 @@ bool seekValueFromMatrix(int column_id, int row_id) {
     Serial.println("@@@@@@@@@@@@@@@@@@@@ BINARY ERROR!!! @@@@@@@@@@@@@@@@@@@@");
   }
 
-  int rail_to_GND = 0;
-  int rail_to_INPUT = 0;
+  int rail_to_HIGH = 0;
+  int rail_to_LOW = 0;
   // int mux_bit_0 = 0;
   // int mux_bit_1 = 0;
   // int mux_bit_2 = 0;
@@ -135,11 +135,11 @@ bool seekValueFromMatrix(int column_id, int row_id) {
   bool is_pill_present = false;
 
   if (column_id == 0) {
-    rail_to_GND = RAIL_EVEN;
-    rail_to_INPUT = RAIL_ODD;
+    rail_to_HIGH = RAIL_0;
+    rail_to_LOW = RAIL_1;
   } else if (column_id == 1) {
-    rail_to_GND = RAIL_ODD;
-    rail_to_INPUT = RAIL_EVEN;
+    rail_to_HIGH = RAIL_1;
+    rail_to_LOW = RAIL_0;
   } else { return -1;}
 
   // mux_bit_0 = row_id & 0b0001;
@@ -147,8 +147,8 @@ bool seekValueFromMatrix(int column_id, int row_id) {
   // mux_bit_2 = row_id & 0b0100;
   // mux_bit_3 = row_id & 0b1000;
 
-  pinMode(rail_to_INPUT, INPUT_PULLUP);
-  digitalWrite(rail_to_GND, LOW);
+  digitalWrite(rail_to_HIGH, HIGH);
+  digitalWrite(rail_to_LOW, LOW);
 
   digitalWrite(MUX_BIT_0, row_id & 0b0001);
   digitalWrite(MUX_BIT_1, row_id & 0b0010);
@@ -180,7 +180,7 @@ bool seekValueFromMatrix(int column_id, int row_id) {
   // }
 
   delay(10);
-  if (digitalRead(PILL_SENSE) == LOW){
+  if (digitalRead(MUX_COM) == HIGH){
     is_pill_present = true;
   }
 
@@ -199,9 +199,8 @@ bool seekValueFromMatrix(int column_id, int row_id) {
   Serial.println(is_pill_present);
   Serial.println("########## END COMPUTED BINARY ##########");
 
-  pinMode(rail_to_INPUT, OUTPUT);
-  digitalWrite(RAIL_EVEN, HIGH);
-  digitalWrite(RAIL_ODD, HIGH);
+  digitalWrite(RAIL_0, LOW);
+  digitalWrite(RAIL_1, LOW);
 
   digitalWrite(MUX_BIT_0, LOW);
   digitalWrite(MUX_BIT_1, LOW);
@@ -214,7 +213,7 @@ bool seekValueFromMatrix(int column_id, int row_id) {
 
 int getPillCount() {
   int total_pill_count = 0;
-  if (digitalRead(PILL_SENSE) == LOW) {
+  if (digitalRead(CASSETTE_SENSE) == LOW) {
     Serial.println("PROBE_ATTACHED");
 
     for (int col = 0; col < 2; col++){