diff --git a/README.md b/README.md
index 7328f88..10fff1e 100644
--- a/README.md
+++ b/README.md
@@ -39,17 +39,12 @@ Supports sensors features:
 **Connections**
 
 The Sensor uses I2C for communication's. Data is outputted (eg to a PC) via a USB.
-Can be set up for any I2C interface and speed. By default I2C0, GPIO16(SDATA) and GPIO17(SCLK) & 100kHz.
-If you want to use the other I2C port (I2C1) in addition to changing in the main.ccp,
-The user must change it in library header as well, could not find a way around this.
-
-* i2c_inst_t *i2c = i2c0 to i2c_inst_t *i2c = i2c1
-
+Can be set up for any I2C interface and bus speed. By default I2C0, GPIO16(SDATA) and GPIO17(SCLK) & 100kHz. 
 
 **Files**
 
 The main.cpp contains tests showing library functions
-There is also an library (ahtxx.cpp and ahtxx.h),
+There is also an library (ahtxx.cpp and ahtxx.hpp),
 
 **Output**
 
diff --git a/extra/doc/CHANGELOG.md b/extra/doc/CHANGELOG.md
index 7407fff..0eac9d1 100644
--- a/extra/doc/CHANGELOG.md
+++ b/extra/doc/CHANGELOG.md
@@ -2,5 +2,7 @@
 
 * version 1.0.0 November 2022
 	* first release
+* version 1.0.1 December 2022	
+	* Change so user can pick any I2C interface (IC20 or IC21)
 
 
diff --git a/include/ahtxx/ahtxx.hpp b/include/ahtxx/ahtxx.hpp
index 0439e8d..5ea1678 100644
--- a/include/ahtxx/ahtxx.hpp
+++ b/include/ahtxx/ahtxx.hpp
@@ -52,8 +52,11 @@ typedef enum ASAIR_I2C_SENSOR_e{
 class LIB_AHTXX
 {
 private:
-    i2c_inst_t *i2c = i2c0;
+    i2c_inst_t *i2c;
     uint8_t  _address;
+    uint8_t _SDataPin;
+    uint8_t _SClkPin;
+    uint16_t _CLKSpeed = 100; //I2C bus speed in khz typically 100-400
     ASAIR_I2C_SENSOR_e _sensorName;
     uint8_t  _rawDataBuffer[6] = {AHT10_ERROR, 0, 0, 0, 0, 0};
     int16_t  returnValue = 0;
@@ -61,10 +64,10 @@ class LIB_AHTXX
 
 public:
     // Constructor
-    LIB_AHTXX(uint8_t , ASAIR_I2C_SENSOR_e);
+    LIB_AHTXX(uint8_t address, i2c_inst_t* i2c_type, uint8_t sdata , uint8_t sclk ,uint16_t clockspeed);
 
-    void     AHT10_InitI2C(i2c_inst_t* i2c_type,  uint8_t sdata , uint8_t sclk ,uint16_t clockspeed);
-    void     AHT10_DeInit(i2c_inst_t* i2c_type);
+    void     AHT10_InitI2C(ASAIR_I2C_SENSOR_e sensorName);
+    void     AHT10_DeInit();
     bool     AHT10_begin();
     uint8_t  AHT10_readRawData();
     float    AHT10_readTemperature(bool);
diff --git a/src/ahtxx/ahtxx.cpp b/src/ahtxx/ahtxx.cpp
index a3a47de..20aff55 100644
--- a/src/ahtxx/ahtxx.cpp
+++ b/src/ahtxx/ahtxx.cpp
@@ -10,29 +10,32 @@
 #include "../include/ahtxx/ahtxx.hpp"
 
 // Constructor Desc init the sensor data types call before begin()
-// Param 1 I2C address
-// Param 2 Enum with Sensor types
+// Param 1 : I2C address
+// Param 2 : IC2 interface , ic20 or i2c1 
+// Param 3 : Data pin I2C
+// Param 4 : Clock pin I2C
+// Param 5 : I2C Clock speed in Khz 0-400Khz
 
-LIB_AHTXX::LIB_AHTXX(uint8_t address, ASAIR_I2C_SENSOR_e sensorName) {
+LIB_AHTXX::LIB_AHTXX(uint8_t address, i2c_inst_t* i2c_type, uint8_t  SDApin, uint8_t  SCLKpin, uint16_t CLKspeed) {
 	_address = address;
-	_sensorName = sensorName;
+	 i2c = i2c_type; 
+    _SClkPin = SCLKpin;
+    _SDataPin = SDApin;
+    _CLKSpeed = CLKspeed;
 }
 
 // Function Desc Initialise the I2C
-// Param 1 : IC2 interface ic20 i2c1 etc
-// Param 2 : Data pin I2C
-// Param 3 : Clock pin I2C
-// Param 4 : I2C Clock speed in Khz 0-400Khz
+// Param 1 :: Enum with Sensor types
 // NOTE :: call before begin method
 
-void LIB_AHTXX::AHT10_InitI2C(i2c_inst_t* i2c_type, uint8_t  SDApin, uint8_t  SCLKpin, uint16_t CLKspeed) {
-	i2c_inst_t *i2c = i2c_type;
+void LIB_AHTXX::AHT10_InitI2C(ASAIR_I2C_SENSOR_e sensorName) {
+	_sensorName = sensorName;
 	//init I2C
-	i2c_init(i2c, CLKspeed * 1000);
-	gpio_set_function(SDApin, GPIO_FUNC_I2C);
-    gpio_set_function(SCLKpin, GPIO_FUNC_I2C);
-	gpio_pull_up(SDApin);
-    gpio_pull_up(SCLKpin);
+	gpio_set_function(_SDataPin, GPIO_FUNC_I2C);
+    gpio_set_function(_SClkPin, GPIO_FUNC_I2C);
+	gpio_pull_up(_SDataPin);
+    gpio_pull_up(_SClkPin);
+	i2c_init(i2c, _CLKSpeed * 1000);
 }
 
  // Function desc: Initialize I2C & configure the sensor, call this function before
@@ -288,9 +291,10 @@ uint8_t LIB_AHTXX::AHT10_getBusyBit(bool readI2C) {
 }
 
 
-void LIB_AHTXX::AHT10_DeInit(i2c_inst_t* i2c_type)
+void LIB_AHTXX::AHT10_DeInit()
 {
-	i2c_inst_t *i2c = i2c_type;
+	gpio_set_function(_SDataPin, GPIO_FUNC_NULL);
+    gpio_set_function(_SClkPin, GPIO_FUNC_NULL);
 	i2c_deinit(i2c); 	
 }
 
diff --git a/src/main.cpp b/src/main.cpp
index c924ccc..ecf103f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -13,16 +13,16 @@
 #include "pico/stdlib.h"
 #include "ahtxx/ahtxx.hpp"
 
-LIB_AHTXX myAHT10(AHT10_ADDRESS_0X38, AHT10_SENSOR);
+LIB_AHTXX myAHT10(AHT10_ADDRESS_0X38, i2c0, 16, 17, 100);
 
 int main(void) {
 
 	float AHT10_temperature;
 	stdio_init_all();  // Initialize chosen serial port, 38400 default baudrate.
-	busy_wait_ms(500);
+	busy_wait_ms(1000);
 
 	printf("AHT10 Start \r\n");
-	myAHT10.AHT10_InitI2C(i2c0, 16, 17, 100);
+	myAHT10.AHT10_InitI2C(AHT10_SENSOR);
 	busy_wait_ms(500);
 
 	// Start the sensor comms