diff --git a/PCF8574.cpp b/PCF8574.cpp
index 36da965..db746d0 100644
--- a/PCF8574.cpp
+++ b/PCF8574.cpp
@@ -60,7 +60,7 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 	 * @param sda: sda pin
 	 * @param scl: scl pin
 	 */
-	PCF8574::PCF8574(uint8_t address, uint8_t sda, uint8_t scl){
+	PCF8574::PCF8574(uint8_t address, int sda, int scl){
 		_wire = &Wire;
 
 		_address = address;
@@ -76,7 +76,7 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 	 * @param interruptPin: pin to set interrupt
  	 * @param interruptFunction: function to call when interrupt raised
 	 */
-	PCF8574::PCF8574(uint8_t address, uint8_t sda, uint8_t scl, uint8_t interruptPin,  void (*interruptFunction)() ){
+	PCF8574::PCF8574(uint8_t address, int sda, int scl, uint8_t interruptPin,  void (*interruptFunction)() ){
 		_wire = &Wire;
 
 		_address = address;
@@ -122,7 +122,7 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 	 * @param sda: sda pin
 	 * @param scl: scl pin
 	 */
-	PCF8574::PCF8574(TwoWire *pWire, uint8_t address, uint8_t sda, uint8_t scl){
+	PCF8574::PCF8574(TwoWire *pWire, uint8_t address, int sda, int scl){
 		_wire = pWire;
 
 		_address = address;
@@ -138,7 +138,7 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 	 * @param interruptPin: pin to set interrupt
 	 * @param interruptFunction: function to call when interrupt raised
 	 */
-	PCF8574::PCF8574(TwoWire *pWire, uint8_t address, uint8_t sda, uint8_t scl, uint8_t interruptPin,  void (*interruptFunction)() ){
+	PCF8574::PCF8574(TwoWire *pWire, uint8_t address, int sda, int scl, uint8_t interruptPin,  void (*interruptFunction)() ){
 		_wire = pWire;
 
 		_address = address;
diff --git a/PCF8574.h b/PCF8574.h
index bab2c78..be3e746 100644
--- a/PCF8574.h
+++ b/PCF8574.h
@@ -2,7 +2,7 @@
  * PCF8574 GPIO Port Expand
  *
  * AUTHOR:  Renzo Mischianti
- * VERSION: 2.3.2
+ * VERSION: 2.3.3
  *
  * https://www.mischianti.org/2019/01/02/pcf8574-i2c-digital-i-o-expander-fast-easy-usage/
  *
@@ -110,17 +110,17 @@ public:
 	PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunction)() );
 
 #if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(__STM32F1__) && !defined(TEENSYDUINO)
-	PCF8574(uint8_t address, uint8_t sda, uint8_t scl);
-	PCF8574(uint8_t address, uint8_t sda, uint8_t scl, uint8_t interruptPin,  void (*interruptFunction)());
+	PCF8574(uint8_t address, int sda, int scl);
+	PCF8574(uint8_t address, int sda, int scl, uint8_t interruptPin,  void (*interruptFunction)());
 #endif
 
 #ifdef ESP32
 	///// changes for second i2c bus
 	PCF8574(TwoWire *pWire, uint8_t address);
-	PCF8574(TwoWire *pWire, uint8_t address, uint8_t sda, uint8_t scl);
+	PCF8574(TwoWire *pWire, uint8_t address, int sda, int scl);
 
 	PCF8574(TwoWire *pWire, uint8_t address, uint8_t interruptPin,  void (*interruptFunction)() );
-	PCF8574(TwoWire *pWire, uint8_t address, uint8_t sda, uint8_t scl, uint8_t interruptPin,  void (*interruptFunction)());
+	PCF8574(TwoWire *pWire, uint8_t address, int sda, int scl, uint8_t interruptPin,  void (*interruptFunction)());
 #endif
 
 	bool begin();
@@ -223,8 +223,8 @@ private:
 	#  endif
 	#endif
 
-	uint8_t _sda = DEFAULT_SDA;
-	uint8_t _scl = DEFAULT_SCL;
+	int _sda = DEFAULT_SDA;
+	int _scl = DEFAULT_SCL;
 
 	TwoWire *_wire;
 
diff --git a/PCF8574_library.h b/PCF8574_library.h
index e82c10d..2e1e943 100644
--- a/PCF8574_library.h
+++ b/PCF8574_library.h
@@ -2,7 +2,7 @@
  * PCF8574 GPIO Port Expand
  *
  * AUTHOR:  Renzo Mischianti
- * VERSION: 2.3.2
+ * VERSION: 2.3.3
  *
  * https://www.mischianti.org/2019/01/02/pcf8574-i2c-digital-i-o-expander-fast-easy-usage/
  *
diff --git a/README.md b/README.md
index 9ffd5e3..208f7f8 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,7 @@ Tutorial:
 To download. click the DOWNLOADS button in the top right corner, rename the uncompressed folder PCF8574. Check that the PCF8574 folder contains `PCF8574\\.cpp` and `PCF8574.h`. Place the DHT library folder your `<arduinosketchfolder>/libraries/` folder. You may need to create the libraries subfolder if its your first library. Restart the IDE.
 
 ## Changelog
+28/07/2022: v2.3.3 Force SDA SCL to use GPIO numeration (https://www.mischianti.org/forums/topic/cannot-set-sda-clk-on-esp8266/).
 28/07/2022: v2.3.2 Fix the SDA SCL type #58 and add basic support for SAMD device.
 26/04/2022: v2.3.1 Fix example for esp32 and double begin issue #56.
 06/04/2022: v2.3.0 Fix package size
diff --git a/library.json b/library.json
index 3fa699d..31b114f 100644
--- a/library.json
+++ b/library.json
@@ -1,6 +1,6 @@
 {
   "name": "PCF8574 library",
-  "version": "2.3.2",
+  "version": "2.3.3",
   "keywords": "digital, i2c, encoder, expander, pcf8574, pcf8574a, esp32, esp8266, stm32, SAMD, Arduino, wire",
   "description": "i2c digital expander for Arduino, esp32, SMT32 and ESP8266. Can read write digital values with only 2 wire. Very simple to use and encoder support.",
   "homepage": "https://www.mischianti.org/category/my-libraries/pcf8574/",
diff --git a/library.properties b/library.properties
index 2cee7fa..bd07bfc 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=PCF8574 library
-version=2.3.2
+version=2.3.3
 author=Renzo Mischianti <renzo.mischianti@gmail.com>
 maintainer=Renzo Mischianti <renzo.mischianti@gmail.com>
 sentence=PCF8574, library for Arduino, ESP8266, smt32 and esp32