diff --git a/8By8/8By8.ino b/8By8/8By8.ino
index 0dc8d58..775026a 100644
--- a/8By8/8By8.ino
+++ b/8By8/8By8.ino
@@ -118,13 +118,12 @@ public:
     }
 
     static void read_data_from_sensor_interrupt() {
+        // Serial.println("Updated!");
         while (Serial1.available()) {
-            WitSerialDataIn(Serial.read());
+            WitSerialDataIn(Serial1.read());
         }
-
         if (SensorReader::s_cDataUpdate) {
             if (SensorReader::s_cDataUpdate & ANGLE_UPDATE) {
-                Serial.println("Updated!");
                 SensorReader::angle.x = sReg[Roll] / 32768.0f * 180.0f;
                 SensorReader::angle.y = sReg[Roll + 1] / 32768.0f * 180.0f;
                 SensorReader::angle.z =
@@ -146,10 +145,50 @@ class Cube {
 private:
     static int layer_count;
     static int brightness_count;
+    static bool blinking_LED_status;
 
 public:
     // Every int represents a row of 8 LED status.
-    static int LED_status[8][8];
+    static uint16_t LED_status[8][8];
+    static uint16_t LED_brightness[8][8];
+    static uint8_t LED_blinking_status[8][8];
+
+    static void set_blinking(int x, int y, int z) {
+        // 1 = enable blinking
+        if (x >= 8 || x < 0 || y >= 8 || y < 0 || z >= 8 || z < 0) {
+            return;
+        }
+        LED_blinking_status[z][x] = LED_blinking_status[z][x] | (1 << y);
+    }
+
+    static void unset_blinking(int x, int y, int z) {
+        if (x >= 8 || x < 0 || y >= 8 || y < 0 || z >= 8 || z < 0) {
+            return;
+        }
+        LED_blinking_status[z][x] = LED_blinking_status[z][x] & (~1 << y);
+
+        LED_status[z][x] = (LED_status[z][x] & (~(3 << (y * 2)))) |
+                           (LED_brightness[z][x] & (3 << (y * 2)));
+    }
+
+    static void do_blinking() {
+        blinking_LED_status ^= 1;
+        for (int i = 0; i < 8; i++) {
+            for (int j = 0; j < 8; j++) {
+                for (int k = 0; k < 8; k++) {
+                    if (LED_blinking_status[i][j] >> k & 1) {
+                        if (blinking_LED_status) {
+                            LED_status[i][j] = LED_brightness[i][j];
+                        }
+                        else {
+                            LED_status[i][j] =
+                                LED_status[i][j] & (~(3 << (k * 2)));
+                        }
+                    }
+                }
+            }
+        }
+    }
 
     static void display() {
         // Serial.println("Here");
@@ -183,19 +222,53 @@ public:
         brightness %= 4;
         LED_status[z][x] =
             (LED_status[z][x] & (~(3 << (y * 2)))) | (brightness << (y * 2));
+        LED_brightness[z][x] = (LED_brightness[z][x] & (~(3 << (y * 2)))) |
+                               (brightness << (y * 2));
     }
 
     static int get_status(int x, int y, int z) {
-        return LED_status[z][x] >> (y * 2) & 3;
+        return LED_brightness[z][x] >> (y * 2) & 3;
     }
 
     static void clear() {
         for (int i = 0; i < 8; i++) {
             for (int j = 0; j < 8; j++) {
+                LED_brightness[i][j] = 0;
                 LED_status[i][j] = 0;
             }
         }
     }
+
+    static void draw_line(int x, int y, int z, int length, int direction,
+                          int brightness) {
+        if (x >= 8 || x < 0 || y >= 8 || y < 0 || z >= 8 || z < 0) {
+            return;
+        }
+        if (direction >= 3 || direction < 0 || length <= 0 || brightness >= 4 ||
+            brightness < 0) {
+            return;
+        }
+        // 0: x
+        // 1: y
+        // 2: z
+        switch (direction) {
+        case 0:
+            for (int i = 0; i < length; i++) {
+                set_status(x + i, y, z, brightness);
+            }
+            break;
+        case 1:
+            for (int i = 0; i < length; i++) {
+                set_status(x, y + i, z, brightness);
+            }
+            break;
+        case 2:
+            for (int i = 0; i < length; i++) {
+                set_status(x, y, z + i, brightness);
+            }
+            break;
+        }
+    }
 };
 
 enum Operators {
@@ -555,7 +628,10 @@ public:
 
 int Cube::layer_count = 0;
 int Cube::brightness_count = 0;
-int Cube::LED_status[8][8] = {0};
+uint16_t Cube::LED_status[8][8] = {0};
+uint16_t Cube::LED_brightness[8][8] = {0};
+uint8_t Cube::LED_blinking_status[8][8] = {0};
+bool Cube::blinking_LED_status = false;
 
 double *Symbol::x_value_ptr, *Symbol::y_value_ptr;
 
@@ -585,6 +661,41 @@ void setup() {
     }
 
     Timer1.attachInterrupt(Cube::display);
+
+    cli();
+    TCCR4A = 0; // set entire TCCR1A register to 0
+    TCCR4B = 0; // same for TCCR1B
+    TCNT4 = 0;  // initialize counter value to 0
+    // set compare match register for 1hz increments
+    OCR4A = 7812 / 1; // = (16*10^6) / (1*1024) - 1 (must be <65536)
+    // 15625 = 1 sec
+    // turn on CTC mode
+    TCCR4B |= (1 << WGM12);
+    // Set CS12 and CS10 bits for 1024 prescaler
+    TCCR4B |= (1 << CS12) | (1 << CS10);
+    // enable timer compare interrupt
+    TIMSK4 |= (1 << OCIE4A);
+
+    TCCR5A = 0;
+    TCCR5B = 0;
+    TCNT5 = 0;
+    OCR5A = 10000 / 1;
+    TCCR5B |= (1 << WGM12);
+    TCCR5B |= (1 << CS12) | (1 << CS10);
+    TIMSK5 |= (1 << OCIE5A);
+    sei();
+
+    Cube::set_status(1, 1, 1, 3);
+    Cube::set_status(1, 1, 2, 3);
+    Cube::set_blinking(1, 1, 2);
+}
+
+ISR(TIMER4_COMPA_vect) {
+    Cube::do_blinking();
+}
+
+ISR(TIMER5_COMPA_vect) {
+    SensorReader::read_data_from_sensor_interrupt();
 }
 
 void loop() {
@@ -598,7 +709,7 @@ void loop() {
     Serial.print("z: ");
     Serial.println(angle.z);
 
-    delay(500);
+    delay(1500);
 
     // String input = "";
     // Serial.println("Input expression");