diff --git a/examples/HC05/HC05.ino b/examples/HC05/HC05.ino
index 26f817e7..d8e79fc5 100644
--- a/examples/HC05/HC05.ino
+++ b/examples/HC05/HC05.ino
@@ -21,9 +21,14 @@ void setup() {
 }
 
 void loop() {
-  // read data incoming from Serial port and write them to bluetooth
   // HC05 supports all methods of the Serial class
+  // read data incoming from Serial port and write them to Bluetooth
   while(Serial.available() > 0) {
     bluetooth.write(Serial.read());
   }
+  
+  // read data incoming from Bluetooth and write them to Serial port
+  while(bluetooth.available() > 0) {
+    Serial.write(bluetooth.read());
+  }
 }
diff --git a/examples/JDY08/JDY08.ino b/examples/JDY08/JDY08.ino
index abe642b8..80436182 100644
--- a/examples/JDY08/JDY08.ino
+++ b/examples/JDY08/JDY08.ino
@@ -19,12 +19,14 @@ void setup() {
 }
 
 void loop() {
-  // read data incoming from Serial port and write them to bluetooth
   // JDY08 supports all methods of the Serial class
+  // read data incoming from Serial port and write them to Bluetooth
   while(Serial.available() > 0) {
-    ble.write(Serial.read());
+    bluetooth.write(Serial.read());
   }
-  while(ble.available() > 0) {
-    Serial.write(ble.read());
+  
+  // read data incoming from Bluetooth and write them to Serial port
+  while(bluetooth.available() > 0) {
+    Serial.write(bluetooth.read());
   }
 }
diff --git a/src/ISerial.cpp b/src/ISerial.cpp
index 21c1e331..0ae9ca47 100644
--- a/src/ISerial.cpp
+++ b/src/ISerial.cpp
@@ -1,7 +1,7 @@
 #include "ISerial.h"
 
-ISerial::ISerial() {
-  
+ISerial::ISerial(Module* mod) {
+  _mod = mod;
 }
 
 void ISerial::begin(long speed) {
diff --git a/src/ISerial.h b/src/ISerial.h
index 27520412..bc271078 100644
--- a/src/ISerial.h
+++ b/src/ISerial.h
@@ -10,7 +10,7 @@
 
 class ISerial {
   public:
-    ISerial();
+    ISerial(Module* mod);
     
     void begin(long);
     bool listen();
diff --git a/src/modules/HC05.cpp b/src/modules/HC05.cpp
index ba73ed15..0dc409d3 100644
--- a/src/modules/HC05.cpp
+++ b/src/modules/HC05.cpp
@@ -1,7 +1,7 @@
 #include "HC05.h"
 
-HC05::HC05(Module* module) {
-  _mod = module;
+HC05::HC05(Module* mod) : ISerial(mod) {
+  
 }
 
 void HC05::begin(long speed) {
diff --git a/src/modules/HC05.h b/src/modules/HC05.h
index 0459d934..d85b2263 100644
--- a/src/modules/HC05.h
+++ b/src/modules/HC05.h
@@ -6,7 +6,7 @@
 class HC05: public ISerial {
   public:
     // constructor
-    HC05(Module* module);
+    HC05(Module* mod);
     
     // basic methods
     void begin(long speed);
diff --git a/src/modules/JDY08.cpp b/src/modules/JDY08.cpp
index 80f8c6d2..36a759dd 100644
--- a/src/modules/JDY08.cpp
+++ b/src/modules/JDY08.cpp
@@ -1,7 +1,7 @@
 #include "JDY08.h"
 
-JDY08::JDY08(Module* module) {
-  _mod = module;
+JDY08::JDY08(Module* mod) : ISerial(mod) {
+  
 }
 
 void JDY08::begin(long speed) {
diff --git a/src/modules/JDY08.h b/src/modules/JDY08.h
index db72e191..eb1b62e1 100644
--- a/src/modules/JDY08.h
+++ b/src/modules/JDY08.h
@@ -6,7 +6,7 @@
 class JDY08: public ISerial {
   public:
     // constructor
-    JDY08(Module* module);
+    JDY08(Module* mod);
     
     // basic methods
     void begin(long speed);