diff --git a/PCF8574.cpp b/PCF8574.cpp
index f34b73e..2e33951 100644
--- a/PCF8574.cpp
+++ b/PCF8574.cpp
@@ -183,7 +183,8 @@ PCF8574::PCF8574(uint8_t address, uint8_t interruptPin,  void (*interruptFunctio
 /**
  * wake up i2c controller
  */
-void PCF8574::begin(){
+bool PCF8574::begin(){
+	this->transmissionStatus = 4;
 	#if !defined(__AVR) && !defined(__STM32F1__) && !defined(TEENSYDUINO)
 		_wire->begin(_sda, _scl);
 	#else
@@ -215,7 +216,7 @@ void PCF8574::begin(){
 		writeByteBuffered = writeModeUp;
 
 		DEBUG_PRINTLN("Start end trasmission if stop here check pullup resistor.");
-		_wire->endTransmission();
+		this->transmissionStatus = _wire->endTransmission();
 	}
 
 //	// If using interrupt set interrupt value to pin
@@ -234,6 +235,8 @@ void PCF8574::begin(){
 
 	// inizialize last read
 	lastReadMillis = millis();
+
+	return this->isLastTransmissionSuccess();
 }
 
 /**
@@ -630,7 +633,7 @@ uint8_t PCF8574::digitalRead(uint8_t pin, bool forceReadNow){
  * @param pin
  * @param value
  */
-void PCF8574::digitalWrite(uint8_t pin, uint8_t value){
+bool PCF8574::digitalWrite(uint8_t pin, uint8_t value){
 	DEBUG_PRINTLN("Begin trasmission");
 	_wire->beginTransmission(_address);     //Begin the transmission to PCF8574
 	DEBUG_PRINT("Value ");
@@ -671,7 +674,9 @@ void PCF8574::digitalWrite(uint8_t pin, uint8_t value){
 //	byteBuffered = (writeByteBuffered & writeMode) & (byteBuffered & readMode);
 	DEBUG_PRINTLN("Start end trasmission if stop here check pullup resistor.");
 
-	_wire->endTransmission();
+	this->transmissionStatus = _wire->endTransmission();
+
+	return this->isLastTransmissionSuccess();
 };
 
 
diff --git a/PCF8574.h b/PCF8574.h
index a8d52e1..b379a3a 100644
--- a/PCF8574.h
+++ b/PCF8574.h
@@ -120,7 +120,7 @@ public:
 	PCF8574(TwoWire *pWire, uint8_t address, uint8_t sda, uint8_t scl, uint8_t interruptPin,  void (*interruptFunction)());
 #endif
 
-	void begin();
+	bool begin();
 	void pinMode(uint8_t pin, uint8_t mode, uint8_t output_start = HIGH);
 
 	void encoder(uint8_t pinA, uint8_t pinB);
@@ -147,7 +147,7 @@ public:
 	#else
 		byte digitalReadAll(void);
 	#endif
-	void digitalWrite(uint8_t pin, uint8_t value);
+	bool digitalWrite(uint8_t pin, uint8_t value);
 
 	bool readEncoderValue(uint8_t pinA, uint8_t pinB, volatile long *encoderValue);
 	int8_t readEncoderValue(uint8_t pinA, uint8_t pinB);
@@ -160,6 +160,13 @@ public:
 		this->latency = latency;
 	}
 
+	uint8_t getTransmissionStatusCode() const {
+		return transmissionStatus;
+	}
+
+	bool isLastTransmissionSuccess(){
+		return transmissionStatus==0;
+	}
 private:
 	uint8_t _address;
 
@@ -207,6 +214,7 @@ private:
 	byte validCW = B01001011;
 	byte validCCW = B11100001;
 
+	uint8_t transmissionStatus = 0;
 };
 
 #endif