diff --git a/src/LED_Port.cpp b/src/LED_Port.cpp
index 75df535..7034927 100644
--- a/src/LED_Port.cpp
+++ b/src/LED_Port.cpp
@@ -2,10 +2,10 @@
 
 void LED_Port::on()
 {
-    refPort.setHigh(pin);
+    refPort.writeHigh(pin);
 }
 
 void LED_Port::off()
 {
-    refPort.setLow(pin);
+    refPort.writeLow(pin);
 }
diff --git a/src/PortInterface.h b/src/PortInterface.h
index 8932e08..fdf6cf7 100644
--- a/src/PortInterface.h
+++ b/src/PortInterface.h
@@ -17,8 +17,8 @@ class PortInterface : public PortWriteInterface
     public:
         virtual void beginProtocol()=0;               //SPI bus or I2C bus
         virtual void begin(const uint8_t activeState)=0; //configure GPIO pins
-        virtual void setLow(const uint8_t pin)=0;
-        virtual void setHigh(const uint8_t pin)=0;
+        virtual void writeLow(const uint8_t pin)=0;
+        virtual void writeHigh(const uint8_t pin)=0;
         virtual uint8_t read()=0;
 };
 #endif
diff --git a/src/PortWriteInterface.h b/src/PortWriteInterface.h
index 0cd35c9..ff9cdbe 100644
--- a/src/PortWriteInterface.h
+++ b/src/PortWriteInterface.h
@@ -14,7 +14,7 @@ write() interface emulates Arduino's digitalWrite().
 class PortWriteInterface
 {
     public:
-        virtual void setLow(const uint8_t pin)=0;
-        virtual void setHigh(const uint8_t pin)=0;
+        virtual void writeLow(const uint8_t pin)=0;
+        virtual void writeHigh(const uint8_t pin)=0;
 };
 #endif
diff --git a/src/Port_MCP23018.cpp b/src/Port_MCP23018.cpp
index 08a017b..8a2a43c 100644
--- a/src/Port_MCP23018.cpp
+++ b/src/Port_MCP23018.cpp
@@ -39,10 +39,10 @@ void Port_MCP23018::begin(const uint8_t activeState)
     Wire.endTransmission();
 }
 
-/* setLow() sets pin output LOW.
+/* writeLow() sets pin output LOW.
 pin is bit pattern, where pin being set is 1.
 */
-void Port_MCP23018::setLow(const uint8_t pin)
+void Port_MCP23018::writeLow(const uint8_t pin)
 {
     outputVal &= ~pin;                 //set pin output to low
 
@@ -52,10 +52,10 @@ void Port_MCP23018::setLow(const uint8_t pin)
     Wire.endTransmission();
 }
 
-/* setHigh() sets pin output HIGH.
+/* writeHigh() sets pin output HIGH.
 pin is bit pattern, where pin being set is 1.
 */
-void Port_MCP23018::setHigh(const uint8_t pin)
+void Port_MCP23018::writeHigh(const uint8_t pin)
 {
     outputVal |= pin;                  //set pin output to high
 
diff --git a/src/Port_MCP23018.h b/src/Port_MCP23018.h
index b756db5..279c588 100644
--- a/src/Port_MCP23018.h
+++ b/src/Port_MCP23018.h
@@ -42,8 +42,8 @@ class Port_MCP23018 : public PortInterface
             : deviceAddr(deviceAddr), portNum(portNum), outputVal(0), readPins(readPins) {}
         void beginProtocol();
         void begin(const uint8_t activeState);
-        virtual void setLow(const uint8_t pin);
-        virtual void setHigh(const uint8_t pin);
+        virtual void writeLow(const uint8_t pin);
+        virtual void writeHigh(const uint8_t pin);
         virtual uint8_t read();
 };
 #endif
diff --git a/src/Port_MCP23S17.cpp b/src/Port_MCP23S17.cpp
index b1aa307..0a68660 100644
--- a/src/Port_MCP23S17.cpp
+++ b/src/Port_MCP23S17.cpp
@@ -52,19 +52,19 @@ void Port_MCP23S17::begin(const uint8_t activeState)
     transfer(deviceAddr << 1, portNum + 0x0C, pullUp); //configure GPPU
 }
 
-/* setLow() sets pin output LOW.
+/* writeLow() sets pin output LOW.
 pin is bit pattern, where pin being set is 1.
 */
-void Port_MCP23S17::setLow(const uint8_t pin)
+void Port_MCP23S17::writeLow(const uint8_t pin)
 {
     outputVal &= ~pin;                 //set pin output to low
     transfer(deviceAddr << 1, portNum + 0x12, outputVal); //set GPIO port to outputVal
 }
 
-/* setHigh() sets pin output HIGH.
+/* writeHigh() sets pin output HIGH.
 pin is bit pattern, where pin being set is 1.
 */
-void Port_MCP23S17::setHigh(const uint8_t pin)
+void Port_MCP23S17::writeHigh(const uint8_t pin)
 {
     outputVal |= pin;                  //set pin output to high
     transfer(deviceAddr << 1, portNum + 0x12, outputVal); //set GPIO port to outputVal
diff --git a/src/Port_MCP23S17.h b/src/Port_MCP23S17.h
index ed1e146..4130c17 100644
--- a/src/Port_MCP23S17.h
+++ b/src/Port_MCP23S17.h
@@ -46,8 +46,8 @@ class Port_MCP23S17 : public PortInterface
             : deviceAddr(deviceAddr), portNum(portNum), outputVal(0), readPins(readPins) {}
         void beginProtocol();
         void begin(const uint8_t activeState);
-        virtual void setLow(const uint8_t pin);
-        virtual void setHigh(const uint8_t pin);
+        virtual void writeLow(const uint8_t pin);
+        virtual void writeHigh(const uint8_t pin);
         virtual uint8_t read();
 };
 #endif
diff --git a/src/Port_PCA9655E.cpp b/src/Port_PCA9655E.cpp
index 6df649b..fa79cc3 100644
--- a/src/Port_PCA9655E.cpp
+++ b/src/Port_PCA9655E.cpp
@@ -25,10 +25,10 @@ void Port_PCA9655E::begin(const uint8_t activeState)
     Wire.endTransmission();
 }
 
-/* setLow() sets pin output LOW.
+/* writeLow() sets pin output LOW.
 pin is bit pattern, where pin being set is 1.
 */
-void Port_PCA9655E::setLow(const uint8_t pin)
+void Port_PCA9655E::writeLow(const uint8_t pin)
 {
     outputVal &= ~pin;                          //set pin output to low
 
@@ -38,10 +38,10 @@ void Port_PCA9655E::setLow(const uint8_t pin)
     Wire.endTransmission();
 }
 
-/* setHigh() sets pin output HIGH.
+/* writeHigh() sets pin output HIGH.
 pin is bit pattern, where pin being set is 1.
 */
-void Port_PCA9655E::setHigh(const uint8_t pin)
+void Port_PCA9655E::writeHigh(const uint8_t pin)
 {
     outputVal |= pin;                           //set pin output to high
 
diff --git a/src/Port_PCA9655E.h b/src/Port_PCA9655E.h
index 876a273..3630a55 100644
--- a/src/Port_PCA9655E.h
+++ b/src/Port_PCA9655E.h
@@ -46,8 +46,8 @@ class Port_PCA9655E : public PortInterface
             : deviceAddr(deviceAddr), portNum(portNum), outputVal(0), readPins(readPins) {}
         void beginProtocol();
         void begin(const uint8_t activeState);
-        virtual void setLow(const uint8_t pin);
-        virtual void setHigh(const uint8_t pin);
+        virtual void writeLow(const uint8_t pin);
+        virtual void writeHigh(const uint8_t pin);
         virtual uint8_t read();
 };
 #endif
diff --git a/src/Port_ShiftRegs.cpp b/src/Port_ShiftRegs.cpp
index 3b438f3..03565f2 100644
--- a/src/Port_ShiftRegs.cpp
+++ b/src/Port_ShiftRegs.cpp
@@ -14,10 +14,10 @@ void Port_ShiftRegs::begin()
     SPI.begin();
 }
 
-/* setLow() sets pin output LOW.
+/* writeLow() sets pin output LOW.
 pin is bit pattern, where pin being set is 1.
 */
-void Port_ShiftRegs::setLow(const uint8_t pin)
+void Port_ShiftRegs::writeLow(const uint8_t pin)
 {
     outputVal &= ~pin;                          //set pin output to low
 
@@ -26,10 +26,10 @@ void Port_ShiftRegs::setLow(const uint8_t pin)
     digitalWrite (slaveSelect, HIGH);
 }
 
-/* setHigh() sets pin output HIGH.
+/* writeHigh() sets pin output HIGH.
 pin is bit pattern, where pin being set is 1.
 */
-void Port_ShiftRegs::setHigh(const uint8_t pin)
+void Port_ShiftRegs::writeHigh(const uint8_t pin)
 {
     outputVal |= pin;                           //set pin output to high
 
diff --git a/src/Port_ShiftRegs.h b/src/Port_ShiftRegs.h
index 00c3620..e464425 100644
--- a/src/Port_ShiftRegs.h
+++ b/src/Port_ShiftRegs.h
@@ -16,7 +16,7 @@ class Port_ShiftRegs : public PortWriteInterface
     public:
         Port_ShiftRegs(const uint8_t slaveSelect);
         void begin();
-        void setLow(const uint8_t pin);
-        void setHigh(const uint8_t pin);
+        void writeLow(const uint8_t pin);
+        void writeHigh(const uint8_t pin);
 };
 #endif
diff --git a/src/Scanner_IOE.cpp b/src/Scanner_IOE.cpp
index 40b037e..56a6b44 100644
--- a/src/Scanner_IOE.cpp
+++ b/src/Scanner_IOE.cpp
@@ -28,11 +28,11 @@ read_pins_t Scanner_IOE::scan(const uint8_t strobePin)
     //strobe on
     if (activeState == LOW)                     //if active low
     {
-        refPortWrite.setLow(strobePin);
+        refPortWrite.writeLow(strobePin);
     }
     else                                        //if active high
     {
-        refPortWrite.setHigh(strobePin);
+        refPortWrite.writeHigh(strobePin);
     }
     delayMicroseconds(3);                       //time to stabilize voltage
 
@@ -42,12 +42,12 @@ read_pins_t Scanner_IOE::scan(const uint8_t strobePin)
     //strobe off
     if (activeState == LOW)                     //if active low
     {
-        refPortWrite.setHigh(strobePin);
+        refPortWrite.writeHigh(strobePin);
         readState = ~readState;
     }
     else                                        //if active high
     {
-        refPortWrite.setLow(strobePin);
+        refPortWrite.writeLow(strobePin);
     }
 
     return readState;