diff --git a/Code/C_Code/17.1.1_LightWater02/LightWater02 b/Code/C_Code/17.1.1_LightWater02/LightWater02
deleted file mode 100644
index 10324b0..0000000
Binary files a/Code/C_Code/17.1.1_LightWater02/LightWater02 and /dev/null differ
diff --git a/Code/C_Code/17.1.1_LightWater02/LightWater02.c b/Code/C_Code/17.1.1_LightWater02/LightWater02.c
index 48656e0..e676292 100644
--- a/Code/C_Code/17.1.1_LightWater02/LightWater02.c
+++ b/Code/C_Code/17.1.1_LightWater02/LightWater02.c
@@ -2,7 +2,7 @@
 * Filename    : LightWater02.c
 * Description : Control LED by 74HC595
 * Author      : freenove
-* modification: 2016/06/21
+* modification: 2018/08/04
 **********************************************************************/
 #include <wiringPi.h>
 #include <stdio.h>
@@ -12,6 +12,23 @@
 #define   latchPin  2   //ST_CP Pin of 74HC595(Pin12)
 #define   clockPin 3    //CH_CP Pin of 74HC595(Pin11)
 
+void _shiftOut(int dPin,int cPin,int order,int val){   
+	int i;  
+    for(i = 0; i < 8; i++){
+        digitalWrite(cPin,LOW);
+        if(order == LSBFIRST){
+            digitalWrite(dPin,((0x01&(val>>i)) == 0x01) ? HIGH : LOW);
+            delayMicroseconds(10);
+		}
+        else {//if(order == MSBFIRST){
+            digitalWrite(dPin,((0x80&(val<<i)) == 0x80) ? HIGH : LOW);
+            delayMicroseconds(10);
+		}
+        digitalWrite(cPin,HIGH);
+        delayMicroseconds(10);
+	}
+}
+
 int main(void)
 {
 	int i;
@@ -27,7 +44,7 @@ int main(void)
 		x=0x01;
 		for(i=0;i<8;i++){
 			digitalWrite(latchPin,LOW);		// Output low level to latchPin
-			shiftOut(dataPin,clockPin,LSBFIRST,x);// Send serial data to 74HC595
+			_shiftOut(dataPin,clockPin,LSBFIRST,x);// Send serial data to 74HC595
 			digitalWrite(latchPin,HIGH); // Output high level to latchPin, and 74HC595 will update the data to the parallel output port.
 			x<<=1; // make the variable move one bit to left once, then the bright LED move one step to the left once.
 			delay(100);
@@ -35,7 +52,7 @@ int main(void)
 		x=0x80;
 		for(i=0;i<8;i++){
 			digitalWrite(latchPin,LOW);
-			shiftOut(dataPin,clockPin,LSBFIRST,x);
+			_shiftOut(dataPin,clockPin,LSBFIRST,x);
 			digitalWrite(latchPin,HIGH);
 			x>>=1;
 			delay(100);
diff --git a/Code/C_Code/18.1.1_SevenSegmentDisplay/SevenSegmentDisplay b/Code/C_Code/18.1.1_SevenSegmentDisplay/SevenSegmentDisplay
deleted file mode 100644
index 2c9fb65..0000000
Binary files a/Code/C_Code/18.1.1_SevenSegmentDisplay/SevenSegmentDisplay and /dev/null differ
diff --git a/Code/C_Code/18.1.1_SevenSegmentDisplay/SevenSegmentDisplay.c b/Code/C_Code/18.1.1_SevenSegmentDisplay/SevenSegmentDisplay.c
index b276072..57d78d7 100644
--- a/Code/C_Code/18.1.1_SevenSegmentDisplay/SevenSegmentDisplay.c
+++ b/Code/C_Code/18.1.1_SevenSegmentDisplay/SevenSegmentDisplay.c
@@ -2,7 +2,7 @@
 * Filename    : SevenSegmentDisplay.c
 * Description : Control SevenSegmentDisplay by 74HC595
 * Author      : freenove
-* modification: 2016/06/24
+* modification: 2018/08/04
 **********************************************************************/
 #include <wiringPi.h>
 #include <stdio.h>
@@ -14,6 +14,23 @@
 //encoding for character 0-F of common anode SevenSegmentDisplay. 
 unsigned char num[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
 
+void _shiftOut(int dPin,int cPin,int order,int val){   
+	int i;  
+    for(i = 0; i < 8; i++){
+        digitalWrite(cPin,LOW);
+        if(order == LSBFIRST){
+            digitalWrite(dPin,((0x01&(val>>i)) == 0x01) ? HIGH : LOW);
+            delayMicroseconds(10);
+		}
+        else {//if(order == MSBFIRST){
+            digitalWrite(dPin,((0x80&(val<<i)) == 0x80) ? HIGH : LOW);
+            delayMicroseconds(10);
+		}
+        digitalWrite(cPin,HIGH);
+        delayMicroseconds(10);
+	}
+}
+
 int main(void)
 {
 	int i;
@@ -27,13 +44,13 @@ int main(void)
 	while(1){
 		for(i=0;i<sizeof(num);i++){
 			digitalWrite(latchPin,LOW);
-			shiftOut(dataPin,clockPin,MSBFIRST,num[i]);//Output the figures and the highest level is transfered preferentially. 
+			_shiftOut(dataPin,clockPin,MSBFIRST,num[i]);//Output the figures and the highest level is transfered preferentially. 
 			digitalWrite(latchPin,HIGH);
 			delay(500);
 		}
 		for(i=0;i<sizeof(num);i++){
 			digitalWrite(latchPin,LOW);
-			shiftOut(dataPin,clockPin,MSBFIRST,num[i] & 0x7f);//Use the "&0x7f" to display the decimal point.
+			_shiftOut(dataPin,clockPin,MSBFIRST,num[i] & 0x7f);//Use the "&0x7f" to display the decimal point.
 			digitalWrite(latchPin,HIGH);
 			delay(500);
 		}
diff --git a/Code/C_Code/18.2.1_StopWatch/a.out b/Code/C_Code/18.2.1_StopWatch/a.out
deleted file mode 100644
index 591eac7..0000000
Binary files a/Code/C_Code/18.2.1_StopWatch/a.out and /dev/null differ
diff --git a/Code/C_Code/19.1.1_LEDMatrix/LEDMatrix b/Code/C_Code/19.1.1_LEDMatrix/LEDMatrix
deleted file mode 100644
index c64c5cf..0000000
Binary files a/Code/C_Code/19.1.1_LEDMatrix/LEDMatrix and /dev/null differ
diff --git a/Code/C_Code/19.1.1_LEDMatrix/LEDMatrix.c b/Code/C_Code/19.1.1_LEDMatrix/LEDMatrix.c
index c1883b3..73d43fc 100644
--- a/Code/C_Code/19.1.1_LEDMatrix/LEDMatrix.c
+++ b/Code/C_Code/19.1.1_LEDMatrix/LEDMatrix.c
@@ -2,7 +2,7 @@
 * Filename    : LEDMatrix.c
 * Description : Control LEDMatrix by 74HC595
 * Author      : freenove
-* modification: 2016/06/24
+* modification: 2018/08/03
 **********************************************************************/
 #include <wiringPi.h>
 #include <stdio.h>
@@ -33,6 +33,22 @@ unsigned char data[]={  // data of "0-F"
     0x00, 0x00, 0x7F, 0x48, 0x48, 0x40, 0x00, 0x00, // "F"
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // " "
 };
+void _shiftOut(int dPin,int cPin,int order,int val){   
+	int i;  
+    for(i = 0; i < 8; i++){
+        digitalWrite(cPin,LOW);
+        if(order == LSBFIRST){
+            digitalWrite(dPin,((0x01&(val>>i)) == 0x01) ? HIGH : LOW);
+            delayMicroseconds(10);
+		}
+        else {//if(order == MSBFIRST){
+            digitalWrite(dPin,((0x80&(val<<i)) == 0x80) ? HIGH : LOW);
+            delayMicroseconds(10);
+		}
+        digitalWrite(cPin,HIGH);
+        delayMicroseconds(10);
+	}
+}
 int main(void)
 {
     int i,j,k;
@@ -49,8 +65,8 @@ int main(void)
             x=0x80;
             for(i=0;i<8;i++){
                 digitalWrite(latchPin,LOW);
-                shiftOut(dataPin,clockPin,LSBFIRST,pic[i]);// first shift data of line information to the first stage 74HC959
-                shiftOut(dataPin,clockPin,LSBFIRST,~x);//then shift data of column information to the second stage 74HC959
+                _shiftOut(dataPin,clockPin,MSBFIRST,pic[i]);// first shift data of line information to the first stage 74HC959
+                _shiftOut(dataPin,clockPin,MSBFIRST,~x);//then shift data of column information to the second stage 74HC959
 
                 digitalWrite(latchPin,HIGH);//Output data of two stage 74HC595 at the same time
                 x>>=1;// display the next column
@@ -62,8 +78,8 @@ int main(void)
                x=0x80;     // Set the column information to start from the first column
                 for(i=k;i<8+k;i++){
                     digitalWrite(latchPin,LOW);
-                    shiftOut(dataPin,clockPin,LSBFIRST,data[i]);
-                    shiftOut(dataPin,clockPin,LSBFIRST,~x);
+                    _shiftOut(dataPin,clockPin,MSBFIRST,data[i]);
+                    _shiftOut(dataPin,clockPin,MSBFIRST,~x);
                     digitalWrite(latchPin,HIGH);
                     x>>=1;
                     delay(1);
diff --git a/Code/Python_Code/00.0.0_Hello/Hello.py b/Code/Python_Code/00.0.0_Hello/Hello.py
new file mode 100644
index 0000000..47e6895
--- /dev/null
+++ b/Code/Python_Code/00.0.0_Hello/Hello.py
@@ -0,0 +1,12 @@
+#!/usr/bin/env python3
+########################################################################
+# Filename    : Blink.py
+# Description : Make an led blinking.
+# auther      : www.freenove.com
+# modification: 2018/08/04
+########################################################################
+
+def Hello():
+	print('Hello World!')
+
+Hello()