diff --git a/PCF8575.cpp b/PCF8575.cpp
index 24058fb..3f5e694 100644
--- a/PCF8575.cpp
+++ b/PCF8575.cpp
@@ -53,7 +53,7 @@ PCF8575::PCF8575(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 	_usingInterrupt = true;
 };
 
-#if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(TEENSYDUINO)
+#if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(TEENSYDUINO) && !defined(ARDUINO_ARCH_RENESAS)
 	/**
 	 * Constructor
 	 * @param address: i2c address
@@ -90,7 +90,7 @@ PCF8575::PCF8575(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 	};
 #endif
 
-#if defined(ESP32) || defined(ARDUINO_ARCH_SAMD) || defined(ARDUINO_ARCH_RP2040) || defined(ARDUINO_ARCH_STM32)
+#if defined(ESP32) || defined(ARDUINO_ARCH_SAMD) || defined(ARDUINO_ARCH_RP2040) || defined(ARDUINO_ARCH_STM32) ||  defined(ARDUINO_ARCH_RENESAS)
 	/**
 	 * Constructor
 	 * @param address: i2c address
@@ -158,7 +158,7 @@ PCF8575::PCF8575(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
  * wake up i2c controller
  */
 void PCF8575::begin(){
-#if !defined(__AVR)  && !defined(ARDUINO_ARCH_SAMD)  && !defined(TEENSYDUINO)
+#if !defined(__AVR)  && !defined(ARDUINO_ARCH_SAMD)  && !defined(TEENSYDUINO) && !defined(ARDUINO_ARCH_RENESAS)
 	DEBUG_PRINT(F("begin(sda, scl) -> "));DEBUG_PRINT(_sda);DEBUG_PRINT(F(" "));DEBUG_PRINTLN(_scl);
 //		_wire->begin(_sda, _scl);
 #ifdef ARDUINO_ARCH_STM32
diff --git a/PCF8575.h b/PCF8575.h
index ba759ce..af9c65b 100644
--- a/PCF8575.h
+++ b/PCF8575.h
@@ -117,12 +117,12 @@ class PCF8575 {
 	PCF8575(uint8_t address);
 	PCF8575(uint8_t address, uint8_t interruptPin,  void (*interruptFunction)() );
 
-#if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(TEENSYDUINO)
+#if !defined(__AVR) && !defined(ARDUINO_ARCH_SAMD) && !defined(TEENSYDUINO) && !defined(ARDUINO_ARCH_RENESAS)
 	PCF8575(uint8_t address, int sda, int scl);
 	PCF8575(uint8_t address, int sda, int scl, uint8_t interruptPin,  void (*interruptFunction)());
 #endif
 
-#if defined(ESP32) || defined(ARDUINO_ARCH_SAMD) || defined(ARDUINO_ARCH_RP2040) || defined(ARDUINO_ARCH_STM32)
+#if defined(ESP32) || defined(ARDUINO_ARCH_SAMD) || defined(ARDUINO_ARCH_RP2040) || defined(ARDUINO_ARCH_STM32) || defined(ARDUINO_ARCH_RENESAS)
 	///// changes for second i2c bus
 	PCF8575(TwoWire *pWire, uint8_t address);
 	PCF8575(TwoWire *pWire, uint8_t address, uint8_t interruptPin,  void (*interruptFunction)() );
diff --git a/README.md b/README.md
index ac2a12d..eb8a74b 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@
 
 Library to use i2c analog IC with arduino and esp8266. Can read and write digital value with only 2 wire (perfect for ESP-01).
 
+ - 10/07/2023: v1.1.1 Add support for Arduino UNO R4
  - 16/02/2023: v1.1.0 
     - Fix STM32 support and add support for Raspberry Pi Pico and other rp2040 boards
     - Add support for custom SERCOM interface of Arduino SAMD devices. Force SDA SCL to use GPIO numeration for STM32 bug (https://www.mischianti.org/forums/topic/compatible-with-stm32duino/). 
diff --git a/library.json b/library.json
index aff497e..d2cbb42 100644
--- a/library.json
+++ b/library.json
@@ -1,6 +1,6 @@
 {
   "name": "PCF8575 library",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "keywords": "digital, i2c, encoder, expander, pcf8575, pcf8575a, esp32, esp8266, stm32, SAMD, Arduino, wire, Raspberry, rp2040",
   "description": "PCF8575 library. i2c digital expander for i2c digital expander for Arduino, Raspberry Pi Pico and rp2040 boards, 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/2019/07/22/pcf8575-i2c-16-bit-digital-i-o-expander/",
diff --git a/library.properties b/library.properties
index 2731c7b..b848e10 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=PCF8575 library
-version=1.1.0
+version=1.1.1
 author=Renzo Mischianti <renzo.mischianti@gmail.com>
 maintainer=Renzo Mischianti <renzo.mischianti@gmail.com>
 sentence=PCF8575, library for Arduino, Raspberry Pi Pico and rp2040 boards, esp32, SMT32 and ESP8266.