diff --git a/include/classes/IoTGpio.h b/include/classes/IoTGpio.h
index 8f3175ab..ede36c2a 100644
--- a/include/classes/IoTGpio.h
+++ b/include/classes/IoTGpio.h
@@ -6,12 +6,12 @@ class IoTGpio {
         IoTGpio(int pins);
         ~IoTGpio();
 
-        virtual void pinMode(uint8_t pin, uint8_t mode);
-        virtual void digitalWrite(uint8_t pin, uint8_t val);
-        virtual int digitalRead(uint8_t pin);
-        virtual int analogRead(uint8_t pin);
-        virtual void analogWrite(uint8_t pin, int val);
-        virtual void digitalInvert(uint8_t pin);
+        virtual void pinMode(int pin, uint8_t mode);
+        virtual void digitalWrite(int pin, uint8_t val);
+        virtual int digitalRead(int pin);
+        virtual int analogRead(int pin);
+        virtual void analogWrite(int pin, int val);
+        virtual void digitalInvert(int pin);
 
         int index;
         void regDriver(IoTGpio* newDriver);
diff --git a/src/classes/IoTGpio.cpp b/src/classes/IoTGpio.cpp
index 71e01b49..f5bef51f 100644
--- a/src/classes/IoTGpio.cpp
+++ b/src/classes/IoTGpio.cpp
@@ -10,32 +10,32 @@ IoTGpio::~IoTGpio(){
 }
 
 
-void IoTGpio::pinMode(uint8_t pin, uint8_t mode) {
+void IoTGpio::pinMode(int pin, uint8_t mode) {
     int pinH = pin/100;
     if (_drivers[pinH]) _drivers[pinH]->pinMode(pin - pinH*100, mode);
     else ::pinMode(pin, mode);
 }
 
-void IoTGpio::digitalWrite(uint8_t pin, uint8_t val) {
+void IoTGpio::digitalWrite(int pin, uint8_t val) {
     int pinH = pin/100;
     if (_drivers[pinH]) _drivers[pinH]->digitalWrite(pin - pinH*100, val);
     else ::digitalWrite(pin, val);
 }
 
-int IoTGpio::digitalRead(uint8_t pin) {
+int IoTGpio::digitalRead(int pin) {
     int pinH = pin/100;
     if (_drivers[pinH]) return _drivers[pinH]->digitalRead(pin - pinH*100);
     else return ::digitalRead(pin);
 }
 
 
-int IoTGpio::analogRead(uint8_t pin) {
+int IoTGpio::analogRead(int pin) {
     int pinH = pin/100;
     if (_drivers[pinH]) return _drivers[pinH]->analogRead(pin - pinH*100);
     else return ::analogRead(pin);
 }
 
-void IoTGpio::analogWrite(uint8_t pin, int val) {
+void IoTGpio::analogWrite(int pin, int val) {
     int pinH = pin/100;
     if (_drivers[pinH]) _drivers[pinH]->analogWrite(pin - pinH*100, val);
     else {
@@ -48,7 +48,7 @@ void IoTGpio::analogWrite(uint8_t pin, int val) {
     }
 }
 
-void IoTGpio::digitalInvert(uint8_t pin) {
+void IoTGpio::digitalInvert(int pin) {
     int pinH = pin/100;
     if (_drivers[pinH]) _drivers[pinH]->digitalInvert(pin - pinH*100);
     else ::digitalWrite(pin, 1 - ::digitalRead(pin));
diff --git a/src/modules/exec/Mcp23008/Mcp23008.cpp b/src/modules/exec/Mcp23008/Mcp23008.cpp
index fef91121..956b2d8f 100644
--- a/src/modules/exec/Mcp23008/Mcp23008.cpp
+++ b/src/modules/exec/Mcp23008/Mcp23008.cpp
@@ -14,19 +14,19 @@ class Mcp23008Driver : public IoTGpio {
         }
     }
 
-    void pinMode(uint8_t pin, uint8_t mode) {
+    void pinMode(int pin, uint8_t mode) {
         _mcp.pinMode(pin, mode);
     }
 
-    void digitalWrite(uint8_t pin, uint8_t val) {
+    void digitalWrite(int pin, uint8_t val) {
         _mcp.digitalWrite(pin, val);
     }
 
-    int digitalRead(uint8_t pin) {
+    int digitalRead(int pin) {
         return _mcp.digitalRead(pin);
     }
 
-    void digitalInvert(uint8_t pin) {
+    void digitalInvert(int pin) {
         _mcp.digitalWrite(pin, 1 - _mcp.digitalRead(pin));
     }
 
diff --git a/src/modules/exec/Mcp23017/Mcp23017.cpp b/src/modules/exec/Mcp23017/Mcp23017.cpp
index b5fc7f06..b22cf151 100644
--- a/src/modules/exec/Mcp23017/Mcp23017.cpp
+++ b/src/modules/exec/Mcp23017/Mcp23017.cpp
@@ -14,19 +14,19 @@ class Mcp23017Driver : public IoTGpio {
         }
     }
 
-    void pinMode(uint8_t pin, uint8_t mode) {
+    void pinMode(int pin, uint8_t mode) {
         _mcp.pinMode(pin, mode);
     }
 
-    void digitalWrite(uint8_t pin, uint8_t val) {
+    void digitalWrite(int pin, uint8_t val) {
         _mcp.digitalWrite(pin, val);
     }
 
-    int digitalRead(uint8_t pin) {
+    int digitalRead(int pin) {
         return _mcp.digitalRead(pin);
     }
 
-    void digitalInvert(uint8_t pin) {
+    void digitalInvert(int pin) {
         _mcp.digitalWrite(pin, 1 - _mcp.digitalRead(pin));
     }
 
diff --git a/src/modules/exec/Pcf8574/Pcf8574.cpp b/src/modules/exec/Pcf8574/Pcf8574.cpp
index 962feea5..f7b5454a 100644
--- a/src/modules/exec/Pcf8574/Pcf8574.cpp
+++ b/src/modules/exec/Pcf8574/Pcf8574.cpp
@@ -30,7 +30,7 @@ class Adafruit_PCF8574_mod {
         return _readbuf;
     }
 
-    bool digitalWrite(uint8_t pinnum, bool val) {
+    bool digitalWrite(int pinnum, bool val) {
         if (val) {
             _writebuf |= 1 << pinnum;
         } else {
@@ -39,7 +39,7 @@ class Adafruit_PCF8574_mod {
         return i2c_dev->write(&_writebuf, 1);         
     }
 
-    bool pinMode(uint8_t pinnum, uint8_t val) {
+    bool pinMode(int pinnum, uint8_t val) {
         if ((val == INPUT) || (val == INPUT_PULLUP)) {
             _writebuf |= 1 << pinnum;
         } else {
@@ -48,7 +48,7 @@ class Adafruit_PCF8574_mod {
         return i2c_dev->write(&_writebuf, 1);
     }
 
-    bool digitalRead(uint8_t pinnum) {
+    bool digitalRead(int pinnum) {
         i2c_dev->read(&_readbuf, 1);
         return (_readbuf >> pinnum) & 0x1;
     }
@@ -70,19 +70,19 @@ class Pcf8574Driver : public IoTGpio {
         }
     }
 
-    void pinMode(uint8_t pin, uint8_t mode) {
+    void pinMode(int pin, uint8_t mode) {
         _pcf.pinMode(pin, mode);
     }
 
-    void digitalWrite(uint8_t pin, uint8_t val) {
+    void digitalWrite(int pin, uint8_t val) {
         _pcf.digitalWrite(pin, val);
     }
 
-    int digitalRead(uint8_t pin) {
+    int digitalRead(int pin) {
         return _pcf.digitalRead(pin);
     }
 
-    void digitalInvert(uint8_t pin) {
+    void digitalInvert(int pin) {
         _pcf.digitalWrite(pin, 1 - _pcf.digitalRead(pin));
     }