diff --git a/MainExample.cpp b/MainExample.cpp
index 0ff0e98..6f555c4 100644
--- a/MainExample.cpp
+++ b/MainExample.cpp
@@ -19,20 +19,11 @@ int main(void)
 {
     cout << "Hello World!\n";
 
-    struct sID id;
-
-    id.description = "Software-Name - Copyright Company 2020";  //use your values here
-    id.deviceID = "Device-Name";                                //use your values here
-    id.softwareID = "0.1.1.8";                                  //use your values here
-    id.hardwareID = "7.77.9";                                   //use your values here
-
-    Logger* logging = new Logger("./test.txt", id);             //use your path here
-
-    logging->info("Alle Systeme laufen!");                      //demo
+    Logger::logThis()->info("Alle Systeme laufen!");                      //demo
     usleep(1465);
-    logging->warning("Alle Systeme laufen!");                   //demo
+    Logger::logThis()->warning("Alle Systeme laufen!");                   //demo
     usleep(51654);
-    logging->error("Alle Systeme laufen!");                     //demo
+    Logger::logThis()->error("Alle Systeme laufen!");                     //demo
 
     cout << "bye!\n";
 
diff --git a/README.md b/README.md
index a53c328..66e74fb 100644
--- a/README.md
+++ b/README.md
@@ -2,4 +2,4 @@
 
 ## build example
 
-clear && g++ -Wall logger.cpp MainExample.cpp -o myTest && ./myTest
+rm -f test.txt && clear && g++ -Wall logger.cpp MainExample.cpp -o myTest && ./myTest
diff --git a/logger.cpp b/logger.cpp
index 1744ad8..f5303da 100644
--- a/logger.cpp
+++ b/logger.cpp
@@ -9,7 +9,10 @@
 
 using namespace std;
 
-string version =  "0.2"; //logger version
+string version =  "0.2.1"; //logger version
+
+bool Logger::instanceFlag = false;
+Logger* Logger::single = NULL;
 
 /**
  * \brief   create new logger instance
@@ -17,21 +20,20 @@ string version =  "0.2"; //logger version
  * \param	struct with data
  * \return  instance of Logger
  */
-Logger::Logger(string pLogPath,struct sID id)
+Logger::Logger()
 {
-    this->logPath =pLogPath;
+    this->logPath = LOG_PATH;
 
     writeLog(menuLine('+', MENU_LINE_SIZE));
-
     writeLog(padStringMenu('+', " ", MENU_LINE_SIZE));
 
-    writeLog(padStringMenu('+', ("Device: " + id.deviceID + " -- " + id.description), MENU_LINE_SIZE));
+    writeLog(padStringMenu('+', ("Device: " + string(DEVICE_ID) + " -- " + string(DESCRIPTION)), MENU_LINE_SIZE));
     writeLog(padStringMenu('+', " ", MENU_LINE_SIZE));
 
-    writeLog(padStringMenu('+', ("Software ID: " + id.softwareID + " -- Build time: " + __DATE__ + " " + __TIME__), MENU_LINE_SIZE));
+    writeLog(padStringMenu('+', ("Software ID: " + string(SOFTWARE_VERSION) + " -- Build time: " + __DATE__ + " " + __TIME__), MENU_LINE_SIZE));
     writeLog(padStringMenu('+', " ", MENU_LINE_SIZE));
 
-    writeLog(padStringMenu('+', ("Hardware ID: " + id.hardwareID + " -- MAC: " + getMacAddress()), MENU_LINE_SIZE));
+    writeLog(padStringMenu('+', ("Hardware ID: " + string(HARDWARE_VERSION) + " -- MAC: " + getMacAddress()), MENU_LINE_SIZE));
     writeLog(padStringMenu('+', " ", MENU_LINE_SIZE));
 
     writeLog(padStringMenu('+', ("cppSimpleLogger -- available from https://git.mosad.xyz/localhorst/cppSimpleLogger -- Version: " + version), MENU_LINE_SIZE));
@@ -44,10 +46,12 @@ Logger::Logger(string pLogPath,struct sID id)
 }
 
 /**
- * \brief   deconctructor
+ * \brief   deconstructor
+ * \return  void
  */
 Logger::~Logger()
 {
+    instanceFlag = false;
 }
 
 /**
@@ -208,7 +212,22 @@ string Logger::menuLine(char cBorder, uint8_t u8LineLenght)
     return result;
 }
 
-
-
+/**
+ * \brief   return a instance of the logger
+ * \return  logger obj
+ */
+Logger* Logger::logThis()
+{
+    if (!instanceFlag)
+        {
+            single = new Logger(); //create new obj
+            instanceFlag = true;
+            return single;
+        }
+    else
+        {
+            return single; //return existing obj
+        }
+}
 
 
diff --git a/logger.h b/logger.h
index 62c4bd0..0ce17d5 100644
--- a/logger.h
+++ b/logger.h
@@ -5,6 +5,9 @@
  * @date    04.09.2020
  */
 
+#ifndef LOGGER_H_
+#define LOGGER_H_
+
 #include <time.h>
 #include <string.h>
 #include <iostream>
@@ -27,32 +30,51 @@ using namespace std;
 
 #define MENU_LINE_SIZE 110 //Size of menu lines
 
-struct sID
-{
-    string description;
-    string deviceID;
-    string softwareID;
-    string hardwareID;
-};
+#ifndef LOG_PATH
+#define LOG_PATH "./test.txt"
+#endif
+
+#ifndef DESCRIPTION
+#define DESCRIPTION "Software-Name - Copyright Company 2020"        //use your values here
+#endif
+
+#ifndef DEVICE_ID
+#define DEVICE_ID  "Device-Name"                                    //use your values here
+#endif
+
+#ifndef SOFTWARE_VERSION
+#define SOFTWARE_VERSION  "0.1.1.8"                                 //use your values here
+#endif
+
+#ifndef HARDWARE_VERSION
+#define HARDWARE_VERSION  "7.77.9"                                  //use your values here
+#endif
 
 class Logger
 {
 private:
     string logPath;
     mutex mtxLog;
+
+    static bool instanceFlag;
+    static Logger *single;
+
     string getTimestamp();
     void writeLog(string s);
     string getMacAddress();
     string padStringMenu(char cBorder, string text, uint8_t u8LineLenght);
     string menuLine(char cBorder, uint8_t u8LineLenght);
+    Logger();
+    ~Logger();
 
 public:
-    Logger(string pLogPath, struct sID id);
-    ~Logger();
+
     void info(string s);
     void warning(string s);
     void error(string s);
     void newLine();
+
+    static Logger* logThis();
 };
 
-
+#endif  // LOGGER_H_
\ No newline at end of file
diff --git a/myTest b/myTest
new file mode 100755
index 0000000..fb3e082
Binary files /dev/null and b/myTest differ
diff --git a/test.txt b/test.txt
new file mode 100644
index 0000000..b9ccbe2
--- /dev/null
+++ b/test.txt
@@ -0,0 +1,17 @@
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++                                                                                                            +
++                        Device: Device-Name -- Software-Name - Copyright Company 2020                       +
++                                                                                                            +
++                           Software ID: 0.1.1.8 -- Build time: Sep  7 2020 15:29:48                         +
++                                                                                                            +
++                                Hardware ID: 7.77.9 -- MAC: 9E:81:AE:7F:00:00                               +
++                                                                                                            +
++     cppSimpleLogger -- available from https://git.mosad.xyz/localhorst/cppSimpleLogger -- Version: 0.2.1   +
++                                                                                                            +
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ 
+07/09/2020 15:29:49.239 [INFO] Created new log file
+ 
+07/09/2020 15:29:49.239 [INFO] Alle Systeme laufen!
+07/09/2020 15:29:49.240 [WARNING] Alle Systeme laufen!
+07/09/2020 15:29:49.292 [ERROR] Alle Systeme laufen!