diff --git a/CHANGELOG.md b/CHANGELOG.md
index cf059c6..32a719e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,8 +7,14 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 
 ## [0.1.10] - 2023-09-24
-- fix Wire1 support for ESP32 (again)
+- refactor API, begin()
+- update examples
+- update readme.md
+
+----
 
+## [0.1.10] - 2023-09-24
+- fix Wire1 support for ESP32 (again)
 
 ## [0.1.9] - 2023-09-23
 - add Wire1 support for ESP32
diff --git a/PCF8575.cpp b/PCF8575.cpp
index a9ede28..b3819fb 100644
--- a/PCF8575.cpp
+++ b/PCF8575.cpp
@@ -2,7 +2,7 @@
 //    FILE: PCF8575.cpp
 //  AUTHOR: Rob Tillaart
 //    DATE: 2020-07-20
-// VERSION: 0.1.10
+// VERSION: 0.2.0
 // PURPOSE: Arduino library for PCF8575 - 16 channel I2C IO expander
 //     URL: https://github.com/RobTillaart/PCF8575
 
@@ -21,25 +21,8 @@ PCF8575::PCF8575(const uint8_t deviceAddress, TwoWire *wire)
 }
 
 
-#if defined (ESP8266) || defined(ESP32)
-bool PCF8575::begin(int dataPin, int clockPin, uint16_t value)
-{
-  if ((dataPin < 255) && (clockPin < 255))
-  {
-    _wire->begin(dataPin, clockPin);
-  } else {
-    _wire->begin();
-  }
-  if (! isConnected()) return false;
-  PCF8575::write16(value);
-  return true;
-}
-#endif
-
-
 bool PCF8575::begin(uint16_t value)
 {
-  _wire->begin();
   if (! isConnected()) return false;
   PCF8575::write16(value);
   return true;
diff --git a/PCF8575.h b/PCF8575.h
index b9da661..d7b1294 100644
--- a/PCF8575.h
+++ b/PCF8575.h
@@ -3,7 +3,7 @@
 //    FILE: PCF8575.h
 //  AUTHOR: Rob Tillaart
 //    DATE: 2020-07-20
-// VERSION: 0.1.10
+// VERSION: 0.2.0
 // PURPOSE: Arduino library for PCF8575 - 16 channel I2C IO expander
 //     URL: https://github.com/RobTillaart/PCF8575
 
@@ -12,7 +12,7 @@
 #include "Wire.h"
 
 
-#define PCF8575_LIB_VERSION      (F("0.1.10"))
+#define PCF8575_LIB_VERSION      (F("0.2.0"))
 
 
 #ifndef PCF8575_INITIAL_VALUE
@@ -30,9 +30,6 @@ class PCF8575
   //  deviceAddress base = 0x20 + depends on address bits
   explicit PCF8575(const uint8_t deviceAddress = 0x20, TwoWire *wire = &Wire);
 
-#if defined (ESP8266) || defined(ESP32)
-  bool     begin(int sda, int scl, uint16_t value = PCF8575_INITIAL_VALUE);
-#endif
   bool     begin(uint16_t value = PCF8575_INITIAL_VALUE);
   bool     isConnected();
 
diff --git a/README.md b/README.md
index 7593d46..b723747 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,15 @@ The library allows to read and write both single pins or 16 pins at once.
 Furthermore some additional functions are implemented that are playful and useful.
 
 
+#### 0.2.0 Breaking change
+
+Version 0.2.0 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()**.
+
+
 #### Interrupts
 
 The PCF8575 has an interrupt output line (INT) to notify an MCU that one of the input lines has changed.
diff --git a/examples/PCF8575_Wire2/PCF8575_Wire2.ino b/examples/PCF8575_Wire2/PCF8575_Wire2.ino
index bf702f2..5ee2dec 100644
--- a/examples/PCF8575_Wire2/PCF8575_Wire2.ino
+++ b/examples/PCF8575_Wire2/PCF8575_Wire2.ino
@@ -2,12 +2,12 @@
 //    FILE: PCF8575_Wire2.ino
 //  AUTHOR: Rob Tillaart
 //    DATE: 2021-01-03
-// PUPROSE: demo
+// PURPOSE: demo
 
 
 #include "PCF8575.h"
 
-// adjust addresses if needed
+//  adjust addresses if needed
 PCF8575 PCF(0x39, &Wire2);
 
 
@@ -18,6 +18,8 @@ void setup()
   Serial.print("PCF8575_LIB_VERSION:\t");
   Serial.println(PCF8575_LIB_VERSION);
 
+  Wire.begin();
+
   if (!PCF.begin())
   {
     Serial.println("could not initialize...");
@@ -75,5 +77,5 @@ void doToggle()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/PCF8575_array/PCF8575_array.ino b/examples/PCF8575_array/PCF8575_array.ino
index 12ac3df..47c0aa6 100644
--- a/examples/PCF8575_array/PCF8575_array.ino
+++ b/examples/PCF8575_array/PCF8575_array.ino
@@ -2,12 +2,12 @@
 //    FILE: PCF8575_array.ino
 //  AUTHOR: Rob Tillaart
 //    DATE: 2021-12-13
-// PUPROSE: demo array of PCF - not tested
+// PURPOSE: demo array of PCF - not tested
 
 
 #include "PCF8575.h"
 
-// adjust addresses if needed
+//  adjust addresses if needed
 PCF8575 A(0x38);
 PCF8575 B(0x39);
 PCF8575 C(0x3A);
@@ -22,6 +22,8 @@ void setup()
   Serial.print("PCF8575_LIB_VERSION:\t");
   Serial.println(PCF8575_LIB_VERSION);
 
+  Wire.begin();
+
   for (int i = 0; i < 3; i++)
   {
     PCF[i].begin();
@@ -52,5 +54,5 @@ void loop()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/PCF8575_interrupt/PCF8575_interrupt.ino b/examples/PCF8575_interrupt/PCF8575_interrupt.ino
index ec70bad..0ecb43d 100644
--- a/examples/PCF8575_interrupt/PCF8575_interrupt.ino
+++ b/examples/PCF8575_interrupt/PCF8575_interrupt.ino
@@ -2,9 +2,9 @@
 //    FILE: PCF8575_interrupt.ino
 //  AUTHOR: Rob Tillaart
 //    DATE: 2021-01-03
-// PUPROSE: test PCF8575 library
+// PURPOSE: test PCF8575 library
 //
-// TEST SETUP
+//  TEST SETUP
 //  Connect INT pin of the PCF8575 to UNO pin 2
 //
 //  (from figure 4 datasheet
@@ -19,7 +19,7 @@ PCF8575 PCF(0x38);
 
 ////////////////////////////////////
 //
-// INTERRUPT ROUTINE + FLAG
+//  INTERRUPT ROUTINE + FLAG
 //
 const int IRQPIN = 2;
 
@@ -33,15 +33,17 @@ void pcf_irq()
 
 ////////////////////////////////////
 //
-// MAIN CODE
+//  MAIN CODE
 //
 void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
-  Serial.print("PCF8575_LIB_VERSION: ");
+  Serial.print("PCF8575_LIB_VERSION:\t");
   Serial.println(PCF8575_LIB_VERSION);
 
+  Wire.begin();
+
   PCF.begin();
 
   pinMode(IRQPIN, INPUT_PULLUP);
@@ -62,10 +64,10 @@ void loop()
     Serial.print('\t');
     Serial.println(x, HEX);
   }
-  // do other things here
+  //  do other things here
   delay(10);
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/PCF8575_isConnected/PCF8575_isConnected.ino b/examples/PCF8575_isConnected/PCF8575_isConnected.ino
index 8c564a0..938333f 100644
--- a/examples/PCF8575_isConnected/PCF8575_isConnected.ino
+++ b/examples/PCF8575_isConnected/PCF8575_isConnected.ino
@@ -2,12 +2,12 @@
 //    FILE: PCF8575_isConnected.ino
 //  AUTHOR: Rob Tillaart
 //    DATE: 2021-01-03
-// PUPROSE: demo device detection
+// PURPOSE: demo device detection
 
 
 #include "PCF8575.h"
 
-// adjust addresses if needed
+//  adjust addresses if needed
 PCF8575 PCF(0x39);
 
 
@@ -18,6 +18,8 @@ void setup()
   Serial.print("PCF8575_LIB_VERSION:\t");
   Serial.println(PCF8575_LIB_VERSION);
 
+  Wire.begin();
+
   if (!PCF.begin())
   {
     Serial.println("could not initialize...");
@@ -38,5 +40,5 @@ void loop()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/PCF8575_performance/PCF8575_performance.ino b/examples/PCF8575_performance/PCF8575_performance.ino
index a3b500b..24799da 100644
--- a/examples/PCF8575_performance/PCF8575_performance.ino
+++ b/examples/PCF8575_performance/PCF8575_performance.ino
@@ -2,7 +2,7 @@
 //    FILE: PCF8575_performance.ino
 //  AUTHOR: Rob Tillaart
 //    DATE: 2021-01-24
-// PUPROSE: test PCF8575 library
+// PURPOSE: test PCF8575 library
 
 
 #include "PCF8575.h"
@@ -21,6 +21,8 @@ void setup()
   Serial.print("PCF8575_LIB_VERSION:\t");
   Serial.println(PCF8575_LIB_VERSION);
 
+  Wire.begin();
+
   PCF.begin();
   Serial.println(PCF.isConnected());
 
@@ -50,5 +52,5 @@ void loop()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/PCF8575_select/PCF8575_select.ino b/examples/PCF8575_select/PCF8575_select.ino
index 391e770..a3a12e6 100644
--- a/examples/PCF8575_select/PCF8575_select.ino
+++ b/examples/PCF8575_select/PCF8575_select.ino
@@ -2,8 +2,7 @@
 //    FILE: PCF8575_select.ino
 //  AUTHOR: Rob Tillaart
 //    DATE: 2022-06-18
-// PUPROSE: demo PCF8575 library select functions
-
+// PURPOSE: demo PCF8575 library select functions
 
 
 #include "PCF8575.h"
@@ -20,6 +19,8 @@ void setup()
   Serial.print("PCF8575_LIB_VERSION:\t");
   Serial.println(PCF8575_LIB_VERSION);
 
+  Wire.begin();
+
   PCF.begin();
   Serial.println(PCF.isConnected());
   Serial.println();
@@ -29,14 +30,14 @@ void setup()
   PCF.selectNone();
   delay(1000);
   
-  // VU meter up
+  //  VU meter up
   for (int i = 0; i < 15; i++)
   {
     PCF.selectN(i);
     delay(100);
   }
 
-  // VU meter down
+  //  VU meter down
   for (int i = 15; i >= 0; i--)
   {
     PCF.selectN(i);
@@ -47,7 +48,7 @@ void setup()
 
 void loop()
 {
-  // night rider
+  //  night rider
   for (int i = 0; i < 15; i++)
   {
     PCF.select(i);
@@ -61,4 +62,5 @@ void loop()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
+
diff --git a/examples/PCF8575_test/PCF8575_test.ino b/examples/PCF8575_test/PCF8575_test.ino
index cfa4281..64b17b1 100644
--- a/examples/PCF8575_test/PCF8575_test.ino
+++ b/examples/PCF8575_test/PCF8575_test.ino
@@ -2,7 +2,7 @@
 //    FILE: PCF8575_test.ino
 //  AUTHOR: Rob Tillaart
 //    DATE: 2020-07-20
-// PUPROSE: test PCF8575 library
+// PURPOSE: test PCF8575 library
 //     URL: https://github.com/RobTillaart/PCF8575
 
 
@@ -15,9 +15,11 @@ void setup()
 {
   Serial.begin(115200);
   Serial.println(__FILE__);
-  Serial.print("PCF8575_test version: ");
+  Serial.print("PCF8575_LIB_VERSION:\t");
   Serial.println(PCF8575_LIB_VERSION);
 
+  Wire.begin();
+
   PCF.begin();
 
   uint16_t x = PCF.read16();
@@ -76,5 +78,5 @@ void printHex(uint16_t x)
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/PCF8575_test1/PCF8575_test1.ino b/examples/PCF8575_test1/PCF8575_test1.ino
index bef1d61..d609065 100644
--- a/examples/PCF8575_test1/PCF8575_test1.ino
+++ b/examples/PCF8575_test1/PCF8575_test1.ino
@@ -2,14 +2,14 @@
 //    FILE: pcf8575_test.ino
 //  AUTHOR: Rob Tillaart
 //    DATE: 2021-01-03
-// PUPROSE: demo
+// PURPOSE: demo
 
 
 #include "PCF8575.h"
 
-// adjust addresses if needed
-PCF8575 PCF_38(0x38);  // add switches to lines  (used as input)
-PCF8575 PCF_39(0x39);  // add leds to lines      (used as output)
+//  adjust addresses if needed
+PCF8575 PCF_38(0x38);  //  add switches to lines  (used as input)
+PCF8575 PCF_39(0x39);  //  add leds to lines      (used as output)
 
 
 void setup()
@@ -19,6 +19,8 @@ void setup()
   Serial.print("PCF8575_LIB_VERSION:\t");
   Serial.println(PCF8575_LIB_VERSION);
 
+  Wire.begin();
+
   PCF_38.begin();
   PCF_39.begin();
 
@@ -65,12 +67,12 @@ void setup()
 
 void loop()
 {
-  // echos the lines
+  //  echos the lines
   uint16_t value = PCF_38.read16();
   PCF_39.write16(value);
   delay(100);
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/PCF8575_test2/PCF8575_test2.ino b/examples/PCF8575_test2/PCF8575_test2.ino
index 9294cdb..38d8e1e 100644
--- a/examples/PCF8575_test2/PCF8575_test2.ino
+++ b/examples/PCF8575_test2/PCF8575_test2.ino
@@ -2,13 +2,13 @@
 //    FILE: pcf8575_test2.ino
 //  AUTHOR: Rob Tillaart
 //    DATE: 2021-01-03
-// PUPROSE: demo rotateLeft, -Right and toggleMask
+// PURPOSE: demo rotateLeft, -Right and toggleMask
 
 
 #include "PCF8575.h"
 
-// adjust addresses if needed
-PCF8575 PCF(0x39);  // add LEDs to lines      (used as output)
+//  adjust addresses if needed
+PCF8575 PCF(0x39);  //  add LEDs to lines      (used as output)
 
 
 void setup()
@@ -18,6 +18,8 @@ void setup()
   Serial.print("PCF8575_LIB_VERSION:\t");
   Serial.println(PCF8575_LIB_VERSION);
 
+  Wire.begin();
+
   PCF.begin();
 
   PCF.write(0, 1);
@@ -51,8 +53,8 @@ void setup()
     delay(100);
   }
 
-  // 0010 0111  -> 0x27
-  // 1110 0100
+  //  0010 0111  -> 0x27
+  //  1110 0100
   PCF.write16(0x2755);
   for (int i = 0; i < 255; i++)
   {
@@ -67,5 +69,5 @@ void loop()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/library.json b/library.json
index 8826e48..a545844 100644
--- a/library.json
+++ b/library.json
@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/PCF8575.git"
   },
-  "version": "0.1.10",
+  "version": "0.2.0",
   "license": "MIT",
   "frameworks": "*",
   "platforms": "*",
diff --git a/library.properties b/library.properties
index 194c411..93f5fa9 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=PCF8575
-version=0.1.10
+version=0.2.0
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Arduino library for PCF8575 - 16 channel I2C IO expander
diff --git a/test/unit_test_001.cpp b/test/unit_test_001.cpp
index 22b91a4..af97f6a 100644
--- a/test/unit_test_001.cpp
+++ b/test/unit_test_001.cpp
@@ -63,6 +63,7 @@ unittest(test_begin)
 {
   PCF8575 PCF(0x38);
 
+  Wire.begin();
   PCF.begin();
 
   int readValue = PCF.read16();
@@ -78,6 +79,8 @@ unittest(test_read)
   PCF8575 PCF(0x38);
   int readValue;
 
+  Wire.begin();
+
   PCF.begin();
   for (int i = 0; i < 8; i++)
   {