diff --git a/dg-arduino/dg-arduino.h b/dg-arduino/dg-arduino.h
new file mode 100644
index 0000000..22a7b40
--- /dev/null
+++ b/dg-arduino/dg-arduino.h
@@ -0,0 +1,85 @@
+#ifndef DG_ARDUINO_H_
+#define DG_ARDUINO_H_
+
+enum {CMD_CLIMA, CMD_TEMP, CMD_ERR, CMD_DEBUG};
+
+struct Packet_t {
+  uint8_t size;
+  uint8_t cmd;
+
+  // Note: at the end a CHK is append and size is automatically updated by SendPacket method
+  Packet_t() {
+  }
+
+  Packet_t(uint8_t size, uint8_t cmd) {
+    this->size = size;
+    this->cmd = cmd;
+  }
+};
+
+struct PackClimaCmd_t : Packet_t {
+  uint8_t cmd_clima;
+  PackClimaCmd_t() {
+    this->size = sizeof(PackClimaCmd_t);
+    this->cmd  = CMD_CLIMA;
+    //this->cmd_clima = cmd_clima;
+  }
+};
+
+struct PackTempCmd_t : Packet_t {
+  uint8_t cmd_temp;
+  PackTempCmd_t() {
+    this->size = sizeof(PackClimaCmd_t);
+    this->cmd  = CMD_TEMP;
+    //this->cmd_temp = cmd_temp;
+  }
+};
+
+struct PackReceived_t : Packet_t {
+  uint8_t buffer[BUF_SIZE];
+  PackReceived_t() {
+    // Uninitalised, will be populated by reading function
+  }
+};
+
+struct PackSendTemp_t : Packet_t {
+  int temp;
+  PackSendTemp_t(int temp) {
+    this->size = sizeof(PackSendTemp_t);
+    this->cmd  = CMD_TEMP;
+    this->temp = temp;
+  }
+};
+
+struct PackError_t : Packet_t {
+  uint8_t err_code;
+  PackError_t(uint8_t err_code) {
+    this->size = sizeof(PackError_t);
+    this->cmd  = CMD_CLIMA;
+    this->err_code = err_code;
+  }
+};
+
+struct PackMsg_t : Packet_t {
+  uint8_t msg[10];
+  PackMsg_t(uint8_t size) {
+    this->size = size + sizeof(Packet_t);
+    this->cmd  = CMD_DEBUG;
+  }
+};
+
+void SendPacket(void *_p) {
+  uint8_t * p = (uint8_t*)_p;
+  uint8_t chk = 0;
+  // increase by one to keep CHK in account
+  uint8_t size = *p;
+  *p = *p + 1;
+  for (uint8_t c = 0; c < size; c++) {
+    Serial.write(*p);
+    chk += *p;
+    p++;
+  }
+  Serial.write(chk);
+}
+
+#endif
diff --git a/dg-arduino/dg-arduino.ino b/dg-arduino/dg-arduino.ino
index 626444d..8663217 100644
--- a/dg-arduino/dg-arduino.ino
+++ b/dg-arduino/dg-arduino.ino
@@ -4,6 +4,7 @@
 */
 
 #include <Servo.h>
+#include "dg-arduino.h"
 #define SERVO_ON  55
 #define SERVO_OFF 80
 #define SERVO_PIN 9
@@ -16,87 +17,6 @@ Servo myServo;
 
 #define BUF_SIZE 10
 
-enum {CMD_CLIMA, CMD_TEMP, CMD_ERR, CMD_DEBUG};
-
-struct Packet_t {
-  uint8_t size;
-  uint8_t cmd;
-
-  // Note: at the end a CHK is append and size is automatically updated by SendPacket method
-  Packet_t() {
-  }
-
-  Packet_t(uint8_t size, uint8_t cmd) {
-    this->size = size;
-    this->cmd = cmd;
-  }
-};
-
-struct PackClimaCmd_t : Packet_t {
-  uint8_t cmd_clima;
-  PackClimaCmd_t(/*uint8_t cmd_clima*/) {
-    this->size = sizeof(*this);
-    this->cmd  = CMD_CLIMA;
-    //this->cmd_clima = cmd_clima;
-  }
-};
-
-struct PackTempCmd_t : Packet_t {
-  uint8_t cmd_temp;
-  PackTempCmd_t(/*uint8_t cmd_temp*/) {
-    this->size = sizeof(*this);
-    this->cmd  = CMD_TEMP;
-    //this->cmd_temp = cmd_temp;
-  }
-};
-
-struct PackReceived_t : Packet_t {
-  uint8_t buffer[BUF_SIZE];
-  PackReceived_t() {
-    // Uninitalised, will be populated by reading function
-  }
-};
-
-struct PackSendTemp_t : Packet_t {
-  int temp;
-  PackSendTemp_t(int temp) {
-    this->size = sizeof(*this);
-    this->cmd  = CMD_TEMP;
-    this->temp = temp;
-  }
-};
-
-struct PackError_t : Packet_t {
-  uint8_t err_code;
-  PackError_t(uint8_t err_code) {
-    this->size = sizeof(PackError_t);
-    this->cmd  = CMD_CLIMA;
-    this->err_code = err_code;
-  }
-};
-
-struct PackMsg_t : Packet_t {
-  uint8_t msg[10];
-  PackMsg_t(uint8_t size) {
-    this->size = size + sizeof(Packet_t);
-    this->cmd  = CMD_DEBUG;
-  }
-};
-
-void SendPacket(void *_p) {
-  uint8_t * p = _p;
-  uint8_t chk = 0;
-  // increase by one to keep CHK in account
-  uint8_t size = *p;
-  *p = *p + 1;
-  for (uint8_t c = 0; c < size; c++) {
-    Serial.write(*p);
-    chk += *p;
-    p++;
-  }
-  Serial.write(chk);
-}
-
 PackReceived_t PackReceived;
 int temperatures[10];
 unsigned long int interval = 30000; // 30 seconds