diff --git a/libraries/HT16K33/CHANGELOG.md b/libraries/HT16K33/CHANGELOG.md
index 741954bd..7c5eddef 100644
--- a/libraries/HT16K33/CHANGELOG.md
+++ b/libraries/HT16K33/CHANGELOG.md
@@ -6,11 +6,22 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 
+## [0.4.0] - 2023-12-05
+- refactor API, begin()
+- update readme.md
+- remove obsolete getAddr() => **getAddress()**
+- rename brightness() => **setBrightness()**
+- add **getBrightness()**
+- rename blink() ==> **setBlink()**
+- add **getBlink()**
+- minor edits
+
+----
+
 ## [0.3.9] - 2023-09-22
 - add Wire1 support for ESP32
 - update readme.md
 
-
 ## [0.3.8] - 2023-02-26
 - add **getBrightness()**
 - moved code to .cpp file (prep 0.4.0)
@@ -20,7 +31,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - update license 2023
 - minor edits
 
-
 ## [0.3.7] - 2022-11-19
 - add displayUnit(float, char);
 - add top c symbol
diff --git a/libraries/HT16K33/HT16K33.cpp b/libraries/HT16K33/HT16K33.cpp
index 70bd9dd5..6275ff02 100644
--- a/libraries/HT16K33/HT16K33.cpp
+++ b/libraries/HT16K33/HT16K33.cpp
@@ -1,7 +1,7 @@
 //
 //    FILE: HT16K33.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.3.9
+// VERSION: 0.4.0
 //    DATE: 2019-02-07
 // PURPOSE: Arduino Library for HT16K33 4x7segment display
 //     URL: https://github.com/RobTillaart/HT16K33
@@ -76,25 +76,8 @@ HT16K33::HT16K33(const uint8_t address, TwoWire *wire)
 }
 
 
-#if defined (ESP8266) || defined(ESP32)
-bool HT16K33::begin(uint8_t sda, uint8_t scl)
-{
-  if ((sda < 255) && (scl < 255))
-  {
-    _wire->begin(sda, scl);
-  } else {
-    _wire->begin();
-  }
-  if (! isConnected()) return false;
-  reset();
-  return true;
-}
-#endif
-
-
 bool HT16K33::begin()
 {
-  _wire->begin();
   if (! isConnected()) return false;
   reset();
   return true;
@@ -113,7 +96,8 @@ void HT16K33::reset()
   displayClear();
   setDigits(1);
   clearCache();
-  brightness(8);
+  setBrightness(8);
+  setBlink(0);
 }
 
 
@@ -136,7 +120,6 @@ void HT16K33::cacheOn()
 }
 
 
-
 void HT16K33::cacheOff()
 {
   _cache = false;
@@ -157,7 +140,7 @@ void HT16K33::displayOn()
 {
   writeCmd(HT16K33_ON);
   writeCmd(HT16K33_DISPLAYON);
-  brightness(_bright);
+  setBrightness(_bright);
 }
 
 
@@ -168,14 +151,21 @@ void HT16K33::displayOff()
 }
 
 
-void HT16K33::blink(uint8_t value)
+void HT16K33::setBlink(uint8_t value)
 {
   if (value > 0x03) value = 0x00;
+  _blink = value;
   writeCmd(HT16K33_BLINKOFF | (value << 1) );
 }
 
 
-void HT16K33::brightness(uint8_t value)
+uint8_t HT16K33::getBlink()
+{
+  return _blink;
+}
+
+
+void HT16K33::setBrightness(uint8_t value)
 {
   if (value == _bright) return;
   _bright = value;
@@ -196,6 +186,12 @@ void HT16K33::setDigits(uint8_t value)
 }
 
 
+uint8_t HT16K33::getDigits()
+{
+  return _digits;
+}
+
+
 void HT16K33::suppressLeadingZeroPlaces(uint8_t value)
 {
   _digits = value > 4 ? 0 : 4 - value;
@@ -433,6 +429,7 @@ bool HT16K33::displayFixedPoint0(float f)
   return inRange;
 }
 
+
 bool HT16K33::displayFixedPoint1(float f)
 {
   bool inRange = ((-99.5 < f) && (f < 999.95));
@@ -440,6 +437,7 @@ bool HT16K33::displayFixedPoint1(float f)
   return inRange;
 }
 
+
 bool HT16K33::displayFixedPoint2(float f)
 {
   bool inRange = ((-9.95 < f) && (f < 99.995));
@@ -447,6 +445,7 @@ bool HT16K33::displayFixedPoint2(float f)
   return inRange;
 }
 
+
 bool HT16K33::displayFixedPoint3(float f)
 {
   bool inRange = ((0 < f) && (f < 9.9995));
@@ -454,6 +453,7 @@ bool HT16K33::displayFixedPoint3(float f)
   return inRange;
 }
 
+
 /////////////////////////////////////////////////////////////////////
 
 void HT16K33::displayTest(uint8_t del)
@@ -608,11 +608,6 @@ uint8_t HT16K33::getAddress()
 
 
 
-
-
-
-
-
 //////////////////////////////////////////////////////////
 //
 // PRIVATE
@@ -628,6 +623,7 @@ void HT16K33::_refresh()
   }
 }
 
+
 void HT16K33::writeCmd(uint8_t cmd)
 {
   _wire->beginTransmission(_address);
diff --git a/libraries/HT16K33/HT16K33.h b/libraries/HT16K33/HT16K33.h
index 10773adc..067ad9d8 100644
--- a/libraries/HT16K33/HT16K33.h
+++ b/libraries/HT16K33/HT16K33.h
@@ -2,7 +2,7 @@
 //
 //    FILE: HT16K33.h
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.3.9
+// VERSION: 0.4.0
 //    DATE: 2019-02-07
 // PURPOSE: Arduino Library for HT16K33 4x7segment display
 //          http://www.adafruit.com/products/1002
@@ -13,7 +13,7 @@
 #include "Wire.h"
 
 
-#define HT16K33_LIB_VERSION         (F("0.3.9"))
+#define HT16K33_LIB_VERSION         (F("0.4.0"))
 
 
 //  Characters
@@ -45,12 +45,8 @@ class HT16K33
 public:
   HT16K33(const uint8_t address, TwoWire *wire = &Wire);   //  0x70 .. 0x77
 
-#if defined (ESP8266) || defined(ESP32)
-  bool    begin(uint8_t sda, uint8_t scl);
-#endif
   bool    begin();
   void    reset();
-
   bool    isConnected();
 
   //  default _cache is true as it is ~3x faster but if one has noise
@@ -64,13 +60,16 @@ public:
   void    displayOn();
   void    displayOff();
 
-  void    brightness(uint8_t value);             //  0 .. 15
+  void    setBrightness(uint8_t value);          //  0 .. 15
   uint8_t getBrightness();
-  void    blink(uint8_t value);                  //  0 .. 3     0 = off
+  void    setBlink(uint8_t value);               //  0 .. 3     0 = off
+  uint8_t getBlink();
 
 
   //  0,1,2,3,4 digits - will replace suppressLeadingZeroPlaces
   void    setDigits(uint8_t value);
+  uint8_t getDigits();
+
 
   void    displayClear();
   bool    displayInt(int n);                   //  -999 .. 9999
@@ -122,14 +121,14 @@ public:
   bool    displayFixedPoint2(float f);
   bool    displayFixedPoint3(float f);
 
-
-  //  OBSOLETE SOON
-  //  use getAddress(); instead.
-  uint8_t getAddr()    { return getAddress(); };
-  
   //  use setDigits(); instead.
   //  0 = off, 1,2,3,4 digits  space instead of 0
-  void suppressLeadingZeroPlaces(uint8_t value);
+  void    suppressLeadingZeroPlaces(uint8_t value);
+
+
+  //  OBSOLETE 0.4.x
+  void    brightness(uint8_t value) { setBrightness(value); };
+  void    blink(uint8_t value)      { setBlink(value); };
 
 
 private:
@@ -143,6 +142,7 @@ private:
   bool    _cache = true;
   uint8_t _digits = 0;
   uint8_t _bright;
+  uint8_t _blink;
 
   TwoWire*  _wire;
 };
diff --git a/libraries/HT16K33/README.md b/libraries/HT16K33/README.md
index cc7470e1..529616ec 100644
--- a/libraries/HT16K33/README.md
+++ b/libraries/HT16K33/README.md
@@ -25,6 +25,15 @@ it is faster for writing on average. The actual gain depends on the
 application and of course the values. 
 
 
+#### 0.4.0 Breaking change
+
+Version 0.4.0 introduced a breaking change.
+You cannot set the pins in **begin()** any more.
+This reduces the dependency of processor dependent Wire implementations.
+The user has to call **Wire.begin()** and can optionally set the Wire pins 
+before calling **begin()**.
+
+
 ## Perfomance 
 
 Version 0.3.0 allows one to switch the caching on/off to enforce
@@ -66,13 +75,12 @@ get leading/trailing zero's correctly.
 #### Setup behaviour
 
 - **HT16K33(const uint8_t address)** address is 0x70..0x77 depending on the jumpers A0..A2. **0x70** is default.
-- **bool begin(uint8_t sda, uint8_t scl)** for ESP32, select I2C pins, initialize I2C and calls **reset()**. 
-Returns false if device not seen on I2C bus.
-- **bool begin()** initialize I2C and calls **reset()**.
-Returns false if device not seen on I2C bus.
-- **bool isConnected()** Returns false if device not seen on I2C bus.
+- **bool begin()** initialize library and calls **reset()**.
+Returns false if address not seen on I2C bus.
+- **bool isConnected()** Returns false if address not seen on I2C bus.
 - **void reset()** resets display.
 
+
 #### Cache
 
 - **void clearCache()** forced clearing of the cache, to be used to switch the cache off just for one write.
@@ -83,10 +91,12 @@ Returns false if device not seen on I2C bus.
 
 - **void displayOn()** enable display.
 - **void displayOff()** disable display, fast way to darken display e.g. for energy consumption.
-- **void brightness(uint8_t value)** values (dim) 0..15 (bright).
-- **void blink(uint8_t value)** values 0..3   0 = off.
+- **void setBrightness(uint8_t value)** values (dim) 0..15 (bright).
+- **void getBrightness()** returns (dim) 0..15 (bright).
+- **void setBlink(uint8_t value)** values 0..3   0 = off.
+- **void getBlink(uint8_t value)** values 0..3   0 = off.
 - **void setDigits(uint8_t value)** values 0..4, minimal number of digits shown, mandatory for large numbers on dual display.
-- **uint8_t getAddress()** idem.
+
 
 
 #### Data types
@@ -115,9 +125,7 @@ The unitChar must be one of the chars supported like HT16K33_C, HT16K33_TOP_C or
 So **displayUnit(25.6, 1, HT16K33_DEGREE)** will display **23.5°**.
 
 
-#### Experimental fixed point
-
-These functions are new and still under investigation.
+#### Fixed point
 
 - **bool displayFixedPoint0(float f)** displays values -999  .. 9999 without decimals.
 - **bool displayFixedPoint1(float f)** displays values -99.9 .. 999.9 with 1 decimals.
@@ -137,7 +145,7 @@ These functions are new and still under investigation.
 - **void display(uint8_t \* array, uint8_t point)** idem + point = position of the digit with point (0..3).
 - **void displayColon(uint8_t on)** 0 = off, all values other are on.
 - **void displayRaw(uint8_t \* array, bool colon)** array of 4 bytes to control one 7seg display + colon flag.
-- **void displayExtraLeds(uint8_t value)** switch on extra leds.
+- **void displayExtraLeds(uint8_t value)** switch on extra LEDs.
 value is in fact a bit mask see table below. 0 = all off.
 
 
@@ -160,12 +168,13 @@ value is in fact a bit mask see table below. 0 = all off.
 - **void dumpSerial(uint8_t \* array, uint8_t point)** debugging equivalent of the display.
 Prints to Serial.
 - **void dumpSerial()** print HEX codes equivalent of the display to Serial.
+- **uint8_t getAddress()** idem.
 
 
-#### Obsolete
+#### Obsolete soon
 
-- suppressLeadingZeroPlaces(uint8_t value) use **setDigits()**
-- getAddr() use **getAddress()**
+- brightness() use setBrightness()
+- blink() use setBlink()
 
 
 ## Characters supported
@@ -209,18 +218,13 @@ See examples
 
 #### Must
 
-Mainly for a 0.4.0
+Mainly for a 0.4.x
 
 - **bool isDisplayOn()** and similar state functions
   - configuration byte: 4 bits brightness, 1 bit on off flag, 1 bit cache flag, 2 blink rate
-  
-  
+
 #### Should 
 
-- **void setBrightness()**
-- **void setBlink()** and **uint8_t getBlink()**
-- **void getDigits()**
-- **FixedPoint()** regular (experimental in 0.3.2)
 
 
 #### Could
@@ -233,7 +237,6 @@ Mainly for a 0.4.0
   - [status] dd.d
 - add examples
   - car battery monitor (voltage divider & analogRead)
-  - 
 - add more "special chars"?
   - #define HT16K33_P  Pascal / Pressure   0x73
   - #define HT16K33_J  joule               0x0E
diff --git a/libraries/HT16K33/examples/demo1/demo1.ino b/libraries/HT16K33/examples/demo1/demo1.ino
index 09949a5d..eb420bdb 100644
--- a/libraries/HT16K33/examples/demo1/demo1.ino
+++ b/libraries/HT16K33/examples/demo1/demo1.ino
@@ -17,9 +17,12 @@ void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
+  Serial.print("HT16K33_LIB_VERSION: ");
+  Serial.println(HT16K33_LIB_VERSION);
 
-  seg.begin();
+  Wire.begin();
   Wire.setClock(100000);
+  seg.begin();
 
   seg.displayOn();
   Serial.println("displayTest()");
@@ -44,17 +47,17 @@ void loop()
   for (int i = 0; i < 16; i++)
   {
     seg.displayHex(0xABC0 + i);
-    seg.brightness(i);
+    seg.setBrightness(i);
     delay(500);
   }
   for (int i = 15; i >= 0; i--)
   {
     seg.displayHex(0xABC0 + i);
-    seg.brightness(i);
+    seg.setBrightness(i);
     delay(500);
   }
   delay(1000);
-  seg.brightness(2);
+  seg.setBrightness(2);
 
   Serial.println("displayClear()");
   seg.displayClear();
@@ -123,14 +126,14 @@ void loop()
     delay(100);
   }
 
-  Serial.println("blink()");
+  Serial.println("setBlink()");
   for (uint8_t i = 0; i < 3; i++)
   {
     seg.displayHex(0xABC0 + i);
-    seg.blink(i);
+    seg.setBlink(i);
     delay(4000);
   }
-  seg.blink(0);
+  seg.setBlink(0);
 
   Serial.print("INT TEST:\t");
   start = millis();
@@ -174,5 +177,5 @@ void loop()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/libraries/HT16K33/examples/demo2/demo2.ino b/libraries/HT16K33/examples/demo2/demo2.ino
index 1b8789e7..3b95899b 100644
--- a/libraries/HT16K33/examples/demo2/demo2.ino
+++ b/libraries/HT16K33/examples/demo2/demo2.ino
@@ -5,6 +5,7 @@
 //     URL: http://www.adafruit.com/products/1002
 //     URL: https://github.com/RobTillaart/HT16K33
 
+
 #include "HT16K33.h"
 
 HT16K33 seg(0x70);
@@ -12,17 +13,21 @@ HT16K33 seg(0x70);
 uint32_t start;
 uint32_t stop;
 
+
 void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
+  Serial.print("HT16K33_LIB_VERSION: ");
+  Serial.println(HT16K33_LIB_VERSION);
 
-  seg.begin();
+  Wire.begin();
   Wire.setClock(100000);
+  seg.begin();
 
   seg.displayOn();
   seg.suppressLeadingZeroPlaces(0);
-    
+
   Serial.println("displayTest()");
   seg.displayTest(100);
   seg.displayOff();
@@ -43,15 +48,15 @@ void loop()
   Serial.println("dim()");
   for (int i = 0; i < 16; i++)
   {
-    seg.brightness(i);
+    seg.setBrightness(i);
     delay(500);
   }
   for (int i = 15; i > 0; i--)
   {
-    seg.brightness(i);
+    seg.setBrightness(i);
     delay(500);
   }
-  seg.brightness(2);
+  seg.setBrightness(2);
 
   Serial.println("displayClear()");
   seg.displayClear();
@@ -100,13 +105,13 @@ void loop()
     delay(100);
   }
 
-  Serial.println("blink()");
+  Serial.println("setBlink()");
   for (uint8_t i = 0; i < 3; i++)
   {
-    seg.blink(i);
+    seg.setBlink(i);
     delay(4000);
   }
-  seg.blink(0);
+  seg.setBlink(0);
 
   Serial.print("INT TEST:\t");
   start = millis();
@@ -140,4 +145,4 @@ void loop()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
diff --git a/libraries/HT16K33/examples/demo3/demo3.ino b/libraries/HT16K33/examples/demo3/demo3.ino
index 8e691206..0ee16f37 100644
--- a/libraries/HT16K33/examples/demo3/demo3.ino
+++ b/libraries/HT16K33/examples/demo3/demo3.ino
@@ -5,6 +5,7 @@
 //     URL: http://www.adafruit.com/products/1002
 //     URL: https://github.com/RobTillaart/HT16K33
 
+
 #include "HT16K33.h"
 
 HT16K33 seg(0x70);
@@ -14,13 +15,17 @@ uint32_t stop;
 
 uint8_t ar[4];
 
+
 void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
+  Serial.print("HT16K33_LIB_VERSION: ");
+  Serial.println(HT16K33_LIB_VERSION);
 
-  seg.begin();
+  Wire.begin();
   Wire.setClock(100000);
+  seg.begin();
 
   seg.displayOn();
   seg.suppressLeadingZeroPlaces(0);
@@ -35,7 +40,7 @@ void setup()
 
 void loop()
 {
-  // comment tests you do not want to see
+  //  comment tests you do not want to see
   test_elsa();
   delay(100);
   test_random();
@@ -69,7 +74,7 @@ void test_random()
 void test_VULeft()
 {
   int val = analogRead(A0);
-  val = val / 120;  // 0..8
+  val = val / 120;          //  0..8
   seg.displayVULeft(val);
 }
 
@@ -82,8 +87,8 @@ void test_VURight()
 
 void test_VUStereo()
 {
-  uint8_t left = analogRead(A0) / 240;   // 0..4
-  uint8_t right = analogRead(A1) / 240;  // 0..4
+  uint8_t left = analogRead(A0) / 240;   //  0..4
+  uint8_t right = analogRead(A1) / 240;  //  0..4
   displayVUStereo(left, right);
 }
 
@@ -139,10 +144,10 @@ void displayVUStereo(uint8_t left, uint8_t right)
   }
   seg.displayRaw(ar);
 
-  // sort of heartbeat
+  //  sort of heartbeat
   static bool t = false;
   seg.displayColon(t);
   t = !t;
 }
 
-// -- END OF FILE --
+//  -- END OF FILE --
diff --git a/libraries/HT16K33/examples/demo_VU/demo_VU.ino b/libraries/HT16K33/examples/demo_VU/demo_VU.ino
index a5d2e2a0..63def435 100644
--- a/libraries/HT16K33/examples/demo_VU/demo_VU.ino
+++ b/libraries/HT16K33/examples/demo_VU/demo_VU.ino
@@ -19,9 +19,12 @@ void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
+  Serial.print("HT16K33_LIB_VERSION: ");
+  Serial.println(HT16K33_LIB_VERSION);
 
-  seg.begin();
+  Wire.begin();
   Wire.setClock(100000);
+  seg.begin();
 
   seg.displayOn();
   seg.setDigits(4);
diff --git a/libraries/HT16K33/examples/demo_cache/demo_cache.ino b/libraries/HT16K33/examples/demo_cache/demo_cache.ino
index 8d749ee7..429de301 100644
--- a/libraries/HT16K33/examples/demo_cache/demo_cache.ino
+++ b/libraries/HT16K33/examples/demo_cache/demo_cache.ino
@@ -17,13 +17,17 @@ void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
+  Serial.print("HT16K33_LIB_VERSION: ");
+  Serial.println(HT16K33_LIB_VERSION);
 
-  seg.begin();
+  Wire.begin();
   Wire.setClock(100000);
+  seg.begin();
+
   seg.displayOn();
-  seg.brightness(2);
+  seg.setBrightness(2);
   seg.displayClear();
-  seg.blink(0);
+  seg.setBlink(0);
 }
 
 
diff --git a/libraries/HT16K33/examples/demo_displayInt/demo_displayInt.ino b/libraries/HT16K33/examples/demo_displayInt/demo_displayInt.ino
index 203f3dc4..bfcdc1b3 100644
--- a/libraries/HT16K33/examples/demo_displayInt/demo_displayInt.ino
+++ b/libraries/HT16K33/examples/demo_displayInt/demo_displayInt.ino
@@ -15,13 +15,17 @@ void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
+  Serial.print("HT16K33_LIB_VERSION: ");
+  Serial.println(HT16K33_LIB_VERSION);
 
-  seg.begin();
+  Wire.begin();
   Wire.setClock(100000);
+  seg.begin();
+
   seg.displayOn();
-  seg.brightness(2);
+  seg.setBrightness(2);
   seg.displayClear();
-  seg.blink(0);
+  seg.setBlink(0);
 }
 
 
diff --git a/libraries/HT16K33/examples/demo_displayRaw/demo_displayRaw.ino b/libraries/HT16K33/examples/demo_displayRaw/demo_displayRaw.ino
index f4ec3cc2..35008898 100644
--- a/libraries/HT16K33/examples/demo_displayRaw/demo_displayRaw.ino
+++ b/libraries/HT16K33/examples/demo_displayRaw/demo_displayRaw.ino
@@ -17,13 +17,17 @@ void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
+  Serial.print("HT16K33_LIB_VERSION: ");
+  Serial.println(HT16K33_LIB_VERSION);
 
-  seg.begin();
+  Wire.begin();
   Wire.setClock(100000);
+  seg.begin();
+
   seg.displayOn();
-  seg.brightness(2);
+  seg.setBrightness(2);
   seg.displayClear();
-  seg.blink(0);
+  seg.setBlink(0);
 
   seg.cacheOff();
   start = millis();
diff --git a/libraries/HT16K33/examples/demo_displayTime/demo_displayTime.ino b/libraries/HT16K33/examples/demo_displayTime/demo_displayTime.ino
index debe5362..128f7894 100644
--- a/libraries/HT16K33/examples/demo_displayTime/demo_displayTime.ino
+++ b/libraries/HT16K33/examples/demo_displayTime/demo_displayTime.ino
@@ -17,9 +17,13 @@ void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
+  Serial.print("HT16K33_LIB_VERSION: ");
+  Serial.println(HT16K33_LIB_VERSION);
 
-  seg.begin();
+  Wire.begin();
   Wire.setClock(100000);
+  seg.begin();
+
   seg.displayOn();
   seg.setDigits(4);
 }
diff --git a/libraries/HT16K33/examples/demo_displayUnit/demo_displayUnit.ino b/libraries/HT16K33/examples/demo_displayUnit/demo_displayUnit.ino
index c2a023f1..86ab32fb 100644
--- a/libraries/HT16K33/examples/demo_displayUnit/demo_displayUnit.ino
+++ b/libraries/HT16K33/examples/demo_displayUnit/demo_displayUnit.ino
@@ -15,9 +15,13 @@ void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
+  Serial.print("HT16K33_LIB_VERSION: ");
+  Serial.println(HT16K33_LIB_VERSION);
 
-  seg.begin();
+  Wire.begin();
   Wire.setClock(100000);
+  seg.begin();
+
   seg.displayOn();
   seg.setDigits(4);
 
diff --git a/libraries/HT16K33/examples/demo_dual1/demo_dual1.ino b/libraries/HT16K33/examples/demo_dual1/demo_dual1.ino
index 73688e9c..ce3036f8 100644
--- a/libraries/HT16K33/examples/demo_dual1/demo_dual1.ino
+++ b/libraries/HT16K33/examples/demo_dual1/demo_dual1.ino
@@ -18,12 +18,15 @@ void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
+  Serial.print("HT16K33_LIB_VERSION: ");
+  Serial.println(HT16K33_LIB_VERSION);
+
+  Wire.begin();
+  Wire.setClock(100000);
 
   left.begin();
   right.begin();
 
-  Wire.setClock(100000);
-
   left.displayOn();
   right.displayOn();
 
diff --git a/libraries/HT16K33/examples/demo_temperature_humidity/demo_temperature_humidity.ino b/libraries/HT16K33/examples/demo_temperature_humidity/demo_temperature_humidity.ino
index 256ac160..b891ed6d 100644
--- a/libraries/HT16K33/examples/demo_temperature_humidity/demo_temperature_humidity.ino
+++ b/libraries/HT16K33/examples/demo_temperature_humidity/demo_temperature_humidity.ino
@@ -23,9 +23,13 @@ void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
+  Serial.print("HT16K33_LIB_VERSION: ");
+  Serial.println(HT16K33_LIB_VERSION);
 
+  Wire.begin();
   Wire.setClock(100000);
   seg.begin();
+  
   seg.displayOn();
 }
 
diff --git a/libraries/HT16K33/examples/test_fixedPoint/test_fixedPoint.ino b/libraries/HT16K33/examples/test_fixedPoint/test_fixedPoint.ino
index 61d326aa..3b2f3d55 100644
--- a/libraries/HT16K33/examples/test_fixedPoint/test_fixedPoint.ino
+++ b/libraries/HT16K33/examples/test_fixedPoint/test_fixedPoint.ino
@@ -15,12 +15,17 @@ void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
+  Serial.print("HT16K33_LIB_VERSION: ");
+  Serial.println(HT16K33_LIB_VERSION);
+
+  Wire.begin();
+  Wire.setClock(100000);
 
   if (! seg.begin())
   {
     Serial.println("not connected");
   }
-  Wire.setClock(100000);
+
   seg.displayOn();
 
   seg.displayFixedPoint0(1.945);
diff --git a/libraries/HT16K33/examples/test_float_decimals/test_float_decimals.ino b/libraries/HT16K33/examples/test_float_decimals/test_float_decimals.ino
index 5a67f6ad..d60b737e 100644
--- a/libraries/HT16K33/examples/test_float_decimals/test_float_decimals.ino
+++ b/libraries/HT16K33/examples/test_float_decimals/test_float_decimals.ino
@@ -15,12 +15,16 @@ void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
+  Serial.print("HT16K33_LIB_VERSION: ");
+  Serial.println(HT16K33_LIB_VERSION);
+
+  Wire.begin();
+  Wire.setClock(100000);
 
   if (! seg.begin())
   {
     Serial.println("not connected");
   }
-  Wire.setClock(100000);
   seg.displayOn();
 
   seg.displayFloat(1.945, 3);
diff --git a/libraries/HT16K33/examples/test_out_of_range/test_out_of_range.ino b/libraries/HT16K33/examples/test_out_of_range/test_out_of_range.ino
index bdb50255..f9db8531 100644
--- a/libraries/HT16K33/examples/test_out_of_range/test_out_of_range.ino
+++ b/libraries/HT16K33/examples/test_out_of_range/test_out_of_range.ino
@@ -16,9 +16,12 @@ void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
+  Serial.print("HT16K33_LIB_VERSION: ");
+  Serial.println(HT16K33_LIB_VERSION);
 
-  seg.begin();
+  Wire.begin();
   Wire.setClock(100000);
+  seg.begin();
 
   seg.displayOn();
 
diff --git a/libraries/HT16K33/examples/test_printfloat/test_printfloat.ino b/libraries/HT16K33/examples/test_printfloat/test_printfloat.ino
index ca11c5a0..4b8e79f9 100644
--- a/libraries/HT16K33/examples/test_printfloat/test_printfloat.ino
+++ b/libraries/HT16K33/examples/test_printfloat/test_printfloat.ino
@@ -15,9 +15,12 @@ void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
+  Serial.print("HT16K33_LIB_VERSION: ");
+  Serial.println(HT16K33_LIB_VERSION);
 
-  seg.begin();
+  Wire.begin();
   Wire.setClock(100000);
+  seg.begin();
 
   seg.displayOn();
 }
diff --git a/libraries/HT16K33/library.json b/libraries/HT16K33/library.json
index 308582b5..8b1890df 100644
--- a/libraries/HT16K33/library.json
+++ b/libraries/HT16K33/library.json
@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/HT16K33.git"
   },
-  "version": "0.3.9",
+  "version": "0.4.0",
   "license": "MIT",
   "frameworks": "*",
   "platforms": "*",
diff --git a/libraries/HT16K33/library.properties b/libraries/HT16K33/library.properties
index 2ca3ff8e..1aab01fb 100644
--- a/libraries/HT16K33/library.properties
+++ b/libraries/HT16K33/library.properties
@@ -1,5 +1,5 @@
 name=HT16K33
-version=0.3.9
+version=0.4.0
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Arduino Library for HT16K33 I2C 4x7segment display
diff --git a/libraries/HT16K33/test/unit_test_001.cpp b/libraries/HT16K33/test/unit_test_001.cpp
index f77cc02a..7c63fffe 100644
--- a/libraries/HT16K33/test/unit_test_001.cpp
+++ b/libraries/HT16K33/test/unit_test_001.cpp
@@ -43,6 +43,7 @@ unittest(test_constructor)
 {
   HT16K33 seg(0x70);
 
+  Wire.begin();
   fprintf(stderr, "None of the functions return anything...\n");
 
   assertEqual(1, 1);
@@ -79,5 +80,5 @@ unittest(test_constants)
 unittest_main()
 
 
-//  --END OF FILE --
+//  -- END OF FILE --