diff --git a/NexSerialConfig.h b/NexSerialConfig.h
index e68ac37..32cc066 100644
--- a/NexSerialConfig.h
+++ b/NexSerialConfig.h
@@ -22,6 +22,9 @@
 /* define serial for debug */
 #define dbSerial Serial
 
+/* define serial for communicate with Nextion screen */
+#define nexSerial Serial2
+
 #ifdef DEBUG_SERIAL_ENABLE
 #define dbSerialPrint(a)    dbSerial.print(a)
 #define dbSerialPrintln(a)  dbSerial.println(a)
@@ -32,7 +35,4 @@
 #define dbSerialBegin(a)
 #endif
 
-/* define serial for communicate with Nextion screen */
-#define nexSerial Serial2
-
 #endif 
diff --git a/NexTouch.cpp b/NexTouch.cpp
index 63ec52e..47feef5 100644
--- a/NexTouch.cpp
+++ b/NexTouch.cpp
@@ -403,6 +403,7 @@ bool NexTouch::getBrightness(uint32_t *brightness)
  */
 bool nexInit(void)
 {
+    dbSerialBegin(9600);
     nexSerial.begin(9600);
     NexTouch::sendCommand("");
     NexTouch::sendCommand("page 0");
diff --git a/examples/CompButton/CompButton.ino b/examples/CompButton/CompButton.ino
index 96883b9..40d734e 100644
--- a/examples/CompButton/CompButton.ino
+++ b/examples/CompButton/CompButton.ino
@@ -45,8 +45,7 @@ void b0PopCallback(void *ptr)
 }
 
 void setup(void)
-{  
-    dbSerialBegin(9600);  
+{    
     nexInit();
     b0.attachPop(b0PopCallback, &b0);
     dbSerialPrintln("setup done"); 
diff --git a/examples/CompCrop/CompCrop.ino b/examples/CompCrop/CompCrop.ino
index 84adf39..58b5182 100644
--- a/examples/CompCrop/CompCrop.ino
+++ b/examples/CompCrop/CompCrop.ino
@@ -39,7 +39,6 @@ void q0PopCallback(void *ptr)
 
 void setup(void)
 {
-    dbSerialBegin(9600);
     nexInit();
     q0.attachPop(q0PopCallback);
     dbSerialPrintln("setup done");
diff --git a/examples/CompHotspot/CompHotspot.ino b/examples/CompHotspot/CompHotspot.ino
index 73c0160..436cca3 100644
--- a/examples/CompHotspot/CompHotspot.ino
+++ b/examples/CompHotspot/CompHotspot.ino
@@ -55,7 +55,6 @@ void hot1PopCallback(void *ptr)
 
 void setup(void)
 {
-    dbSerialBegin(9600);
     nexInit();
     hot0.attachPush(hot0PushCallback, &hot0);
     hot0.attachPop(hot0PopCallback, &hot0);
diff --git a/examples/CompPage/CompPage.ino b/examples/CompPage/CompPage.ino
index 60a8ff8..0b3d05d 100644
--- a/examples/CompPage/CompPage.ino
+++ b/examples/CompPage/CompPage.ino
@@ -55,7 +55,6 @@ void page3PopCallback(void *ptr)
 
 void setup(void)
 {   
-    dbSerialBegin(9600);
     nexInit();
     dbSerialPrintln("setup begin");
     
diff --git a/examples/CompPicture/CompPicture.ino b/examples/CompPicture/CompPicture.ino
index 7c22ef2..2e8918b 100644
--- a/examples/CompPicture/CompPicture.ino
+++ b/examples/CompPicture/CompPicture.ino
@@ -45,7 +45,6 @@ void p0PopCallback(void *ptr)
 
 void setup(void)
 {
-    dbSerialBegin(9600);
     nexInit();
     p0.attachPop(p0PopCallback);
     dbSerialPrintln("setup done");
diff --git a/examples/CompPointer/CompPointer.ino b/examples/CompPointer/CompPointer.ino
index e874fc3..e68e827 100644
--- a/examples/CompPointer/CompPointer.ino
+++ b/examples/CompPointer/CompPointer.ino
@@ -61,7 +61,6 @@ void buttonDownPopCallback(void *ptr)
 
 void setup(void)
 {
-    dbSerialBegin(9600);
     nexInit();
     btn_up.attachPop(buttonUpPopCallback);
     btn_down.attachPop(buttonDownPopCallback);
diff --git a/examples/CompProgressBar/CompProgressBar.ino b/examples/CompProgressBar/CompProgressBar.ino
index c31af63..a7bd22c 100644
--- a/examples/CompProgressBar/CompProgressBar.ino
+++ b/examples/CompProgressBar/CompProgressBar.ino
@@ -61,9 +61,6 @@ void buttonDownPopCallback(void *ptr)
 
 void setup(void)
 {
-    uint32_t brightness = 0;
-    
-    dbSerialBegin(9600);
     nexInit();
     btn_up.attachPop(buttonUpPopCallback);
     btn_down.attachPop(buttonDownPopCallback);
diff --git a/examples/CompText/CompText.ino b/examples/CompText/CompText.ino
index a298022..24e2429 100644
--- a/examples/CompText/CompText.ino
+++ b/examples/CompText/CompText.ino
@@ -80,7 +80,6 @@ void b1PopCallback(void *ptr)
 
 void setup(void)
 {
-    dbSerialBegin(9600);
     nexInit();
     dbSerialPrintln("setup done");
 }