diff --git a/examples/IOE_PCA9655E_development/PCA9655E_5_keybrd/keybrd_PCA9655E.ino b/examples/IOE_PCA9655E_development/PCA9655E_5_keybrd/PCA9655E_5_keybrd.ino
similarity index 94%
rename from examples/IOE_PCA9655E_development/PCA9655E_5_keybrd/keybrd_PCA9655E.ino
rename to examples/IOE_PCA9655E_development/PCA9655E_5_keybrd/PCA9655E_5_keybrd.ino
index dd90774..9e759e9 100644
--- a/examples/IOE_PCA9655E_development/PCA9655E_5_keybrd/keybrd_PCA9655E.ino
+++ b/examples/IOE_PCA9655E_development/PCA9655E_5_keybrd/PCA9655E_5_keybrd.ino
@@ -1,4 +1,4 @@
-/* keybrd_PCA9655E.ino
+/* PCA9655E_5_keybrd.ino
 keyboard layout is same as top-left keys of DH matrices:
 
   Controller                I/O expander
@@ -90,9 +90,9 @@ Row row_R1(scanner_R, 1<<1, ptrsKeys_R1, KEY_COUNT_R1);
 void setup()
 {
     delay(6000);
-    Keyboard.print("keybrd_PCA9655E.ino ");
+    Keyboard.print("PCA9655E_5_keybrd.ino ");
 
-    //Keyboard.begin(); not needed ?? it's in DH mainSketch.cpp and keybrd_4c_split_keyboard_with_IOE.ino
+    //Keyboard.begin();todo not needed ?? it's in DH mainSketch.cpp and keybrd_4c_split_keyboard_with_IOE.ino
     scanner_R.begin();
 }
 
diff --git a/src/LED_Port.cpp b/src/LED_Port.cpp
index c7c4f48..75df535 100644
--- a/src/LED_Port.cpp
+++ b/src/LED_Port.cpp
@@ -2,10 +2,10 @@
 
 void LED_Port::on()
 {
-    refPort.write(pin, HIGH);
+    refPort.setHigh(pin);
 }
 
 void LED_Port::off()
 {
-    refPort.write(pin, LOW);
+    refPort.setLow(pin);
 }
diff --git a/src/PortInterface.h b/src/PortInterface.h
index 5295b92..ca45b0f 100644
--- a/src/PortInterface.h
+++ b/src/PortInterface.h
@@ -17,7 +17,8 @@ class PortInterface : public PortWriteInterface
     public:
         virtual void beginProtocol()=0;               //SPI bus or I2C bus
         virtual void begin(const uint8_t strobeOn)=0; //configure GPIO pins
-        virtual void write(const uint8_t pin, const bool pinLogicLevel)=0;
+        virtual void setLow(const uint8_t pin)=0;
+        virtual void setHigh(const uint8_t pin)=0;
         virtual uint8_t read()=0;
 };
 #endif
diff --git a/src/PortWriteInterface.h b/src/PortWriteInterface.h
index 98ee81c..0cd35c9 100644
--- a/src/PortWriteInterface.h
+++ b/src/PortWriteInterface.h
@@ -14,6 +14,7 @@ write() interface emulates Arduino's digitalWrite().
 class PortWriteInterface
 {
     public:
-        virtual void write(const uint8_t pin, const bool pinLogicLevel)=0;
+        virtual void setLow(const uint8_t pin)=0;
+        virtual void setHigh(const uint8_t pin)=0;
 };
 #endif
diff --git a/src/Port_MCP23018.cpp b/src/Port_MCP23018.cpp
index 3e83115..50ebbc8 100644
--- a/src/Port_MCP23018.cpp
+++ b/src/Port_MCP23018.cpp
@@ -39,21 +39,25 @@ void Port_MCP23018::begin(const uint8_t strobeOn)
     Wire.endTransmission();
 }
 
-/* write() sets pin output to logicLevel.
-pin is bit pattern, where pin being strobed is 1.
-logicLevel is HIGH or LOW.
-write() does not overwrite the other pins.
+/* setLow() sets pin output LOW.
+pin is bit pattern, where pin being set is 1.
 */
-void Port_MCP23018::write(const uint8_t pin, const bool logicLevel)
+void Port_MCP23018::setLow(const uint8_t pin)
 {
-    if (logicLevel == LOW)
-    {
-        outputVal &= ~pin;                      //set pin output to low
-    }
-    else
-    {
-        outputVal |= pin;                       //set pin output to high
-    }
+    outputVal &= ~pin;                 //set pin output to low
+
+    Wire.beginTransmission(deviceAddr);
+    Wire.write(portNum + 0x12);                 //GPIO
+    Wire.write(outputVal);
+    Wire.endTransmission();
+}
+
+/* setHigh() sets pin output HIGH.
+pin is bit pattern, where pin being set is 1.
+*/
+void Port_MCP23018::setHigh(const uint8_t pin)
+{
+    outputVal |= pin;                  //set pin output to high
 
     Wire.beginTransmission(deviceAddr);
     Wire.write(portNum + 0x12);                 //GPIO
diff --git a/src/Port_MCP23018.h b/src/Port_MCP23018.h
index a58f8aa..83ffc97 100644
--- a/src/Port_MCP23018.h
+++ b/src/Port_MCP23018.h
@@ -42,7 +42,8 @@ class Port_MCP23018 : public PortInterface
             : deviceAddr(deviceAddr), portNum(portNum), outputVal(0), readPins(readPins) {}
         void beginProtocol();
         void begin(const uint8_t strobeOn);
-        virtual void write(const uint8_t pin, const bool logicLevel);
+        virtual void setLow(const uint8_t pin);
+        virtual void setHigh(const uint8_t pin);
         virtual uint8_t read();
 };
 #endif
diff --git a/src/Port_MCP23S17.cpp b/src/Port_MCP23S17.cpp
index 5717d79..2a22fa5 100644
--- a/src/Port_MCP23S17.cpp
+++ b/src/Port_MCP23S17.cpp
@@ -52,22 +52,21 @@ void Port_MCP23S17::begin(const uint8_t strobeOn)
     transfer(deviceAddr << 1, portNum + 0x0C, pullUp); //configure GPPU
 }
 
-/* write() sets pin output to logicLevel (useful for strobePin, one LED pin, or multiple pins).
+/* setLow() sets pin output LOW.
 pin is bit pattern, where pin being set is 1.
-logicLevel is HIGH or LOW.
-write() does not overwrite the other pins.
 */
-void Port_MCP23S17::write(const uint8_t pin, const bool logicLevel)
+void Port_MCP23S17::setLow(const uint8_t pin)
 {
-    if (logicLevel == LOW)
-    {
-        outputVal &= ~pin;                 //set pin output to low
-    }
-    else
-    {
-        outputVal |= pin;                  //set pin output to high
-    }
+    outputVal &= ~pin;                 //set pin output to low
+    transfer(deviceAddr << 1, portNum + 0x12, outputVal); //set GPIO port to outputVal
+}
 
+/* setHigh() sets pin output HIGH.
+pin is bit pattern, where pin being set is 1.
+*/
+void Port_MCP23S17::setHigh(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 d3ed6ef..784bc60 100644
--- a/src/Port_MCP23S17.h
+++ b/src/Port_MCP23S17.h
@@ -46,7 +46,8 @@ class Port_MCP23S17 : public PortInterface
             : deviceAddr(deviceAddr), portNum(portNum), outputVal(0), readPins(readPins) {}
         void beginProtocol();
         void begin(const uint8_t strobeOn);
-        virtual void write(const uint8_t pin, const bool logicLevel);
+        virtual void setLow(const uint8_t pin);
+        virtual void setHigh(const uint8_t pin);
         virtual uint8_t read();
 };
 #endif
diff --git a/src/Port_PCA9655E.cpp b/src/Port_PCA9655E.cpp
index d9dcec4..1df0de9 100644
--- a/src/Port_PCA9655E.cpp
+++ b/src/Port_PCA9655E.cpp
@@ -25,21 +25,25 @@ void Port_PCA9655E::begin(const uint8_t strobeOn)
     Wire.endTransmission();
 }
 
-/* write() sets pin output to logicLevel.
-pin is bit pattern, where pin being strobed is 1.
-logicLevel is HIGH or LOW.
-write() does not overwrite the other pins.
+/* setLow() sets pin output LOW.
+pin is bit pattern, where pin being set is 1.
 */
-void Port_PCA9655E::write(const uint8_t pin, const bool logicLevel)
+void Port_PCA9655E::setLow(const uint8_t pin)
 {
-    if (logicLevel == LOW)
-    {
-        outputVal &= ~pin;                      //set pin output to low
-    }
-    else
-    {
-        outputVal |= pin;                       //set pin output to high
-    }
+    outputVal &= ~pin;                          //set pin output to low
+
+    Wire.beginTransmission(deviceAddr);
+    Wire.write(portNum + 2);                    //output Byte command
+    Wire.write(outputVal);
+    Wire.endTransmission();
+}
+
+/* setHigh() sets pin output HIGH.
+pin is bit pattern, where pin being set is 1.
+*/
+void Port_PCA9655E::setHigh(const uint8_t pin)
+{
+    outputVal |= pin;                           //set pin output to high
 
     Wire.beginTransmission(deviceAddr);
     Wire.write(portNum + 2);                    //output Byte command
diff --git a/src/Port_PCA9655E.h b/src/Port_PCA9655E.h
index 486c37b..133d3c2 100644
--- a/src/Port_PCA9655E.h
+++ b/src/Port_PCA9655E.h
@@ -46,7 +46,8 @@ class Port_PCA9655E : public PortInterface
             : deviceAddr(deviceAddr), portNum(portNum), outputVal(0), readPins(readPins) {}
         void beginProtocol();
         void begin(const uint8_t strobeOn);
-        virtual void write(const uint8_t pin, const bool logicLevel);
+        virtual void setLow(const uint8_t pin);
+        virtual void setHigh(const uint8_t pin);
         virtual uint8_t read();
 };
 #endif
diff --git a/src/Port_ShiftRegs.cpp b/src/Port_ShiftRegs.cpp
index 15ae6bd..3b438f3 100644
--- a/src/Port_ShiftRegs.cpp
+++ b/src/Port_ShiftRegs.cpp
@@ -14,16 +14,24 @@ void Port_ShiftRegs::begin()
     SPI.begin();
 }
 
-void Port_ShiftRegs::write(const uint8_t pin, const bool logicLevel)
+/* setLow() sets pin output LOW.
+pin is bit pattern, where pin being set is 1.
+*/
+void Port_ShiftRegs::setLow(const uint8_t pin)
 {
-    if (logicLevel == LOW)
-    {
-        outputVal &= ~pin;                      //set pin output to low
-    }
-    else
-    {
-        outputVal |= pin;                       //set pin output to high
-    }
+    outputVal &= ~pin;                          //set pin output to low
+
+    digitalWrite(slaveSelect, LOW);
+    SPI.transfer(outputVal);
+    digitalWrite (slaveSelect, HIGH);
+}
+
+/* setHigh() sets pin output HIGH.
+pin is bit pattern, where pin being set is 1.
+*/
+void Port_ShiftRegs::setHigh(const uint8_t pin)
+{
+    outputVal |= pin;                           //set pin output to high
 
     digitalWrite(slaveSelect, LOW);
     SPI.transfer(outputVal);
diff --git a/src/Port_ShiftRegs.h b/src/Port_ShiftRegs.h
index 4f379d9..00c3620 100644
--- a/src/Port_ShiftRegs.h
+++ b/src/Port_ShiftRegs.h
@@ -16,6 +16,7 @@ class Port_ShiftRegs : public PortWriteInterface
     public:
         Port_ShiftRegs(const uint8_t slaveSelect);
         void begin();
-        void write(const uint8_t pin, const bool logicLevel);
+        void setLow(const uint8_t pin);
+        void setHigh(const uint8_t pin);
 };
 #endif
diff --git a/src/Scanner_IOE.cpp b/src/Scanner_IOE.cpp
index ca02d2f..40b037e 100644
--- a/src/Scanner_IOE.cpp
+++ b/src/Scanner_IOE.cpp
@@ -26,18 +26,29 @@ read_pins_t Scanner_IOE::scan(const uint8_t strobePin)
     uint8_t readState;                          //bits, 1 means key is pressed, 0 means released
 
     //strobe on
-    refPortWrite.write(strobePin, activeState);
+    if (activeState == LOW)                     //if active low
+    {
+        refPortWrite.setLow(strobePin);
+    }
+    else                                        //if active high
+    {
+        refPortWrite.setHigh(strobePin);
+    }
     delayMicroseconds(3);                       //time to stabilize voltage
 
     //read the port pins
     readState = refPortRead.read();
 
     //strobe off
-    refPortWrite.write(strobePin, !activeState);
-
     if (activeState == LOW)                     //if active low
     {
+        refPortWrite.setHigh(strobePin);
         readState = ~readState;
     }
+    else                                        //if active high
+    {
+        refPortWrite.setLow(strobePin);
+    }
+
     return readState;
 }