diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index e794407..f14431e 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -134,6 +134,8 @@ A healthy project needs the perspective of many people.
 Submitting a pull request
 -------------------------
 Pull request is the preferred way to contribute code and documentation.
+[How to contribute to an open source project on GitHub](http://blog.davidecoppola.com/2016/11/howto-contribute-to-open-source-project-on-github/)
+
 If you want to contribute some other way, please make a request in 
 [GitHub issues](https://github.com/wolfv6/Keybrd/issues)
 or [geekhack thread](https://geekhack.org/index.php?topic=83599.0).
diff --git a/README.md b/README.md
index 45ee635..7150712 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@ keybrd_DH and its instantiation files contain about 800 lines of code.
 
 [keybrd_DH_library_developer_guide.md](https://github.com/wolfv6/keybrd_DH/blob/master/doc/keybrd_DH_library_developer_guide.md)<br>
 [mainSketch.ino](https://github.com/wolfv6/keybrd_DH/blob/master/examples/keybrd_DH/mainSketch.cpp)<br>
-[instantiations_scannersLEDs.h](https://github.com/wolfv6/keybrd_DH/blob/master/src/instantiations_pins.h)<br>
+[instantiations_scannersLEDs.h](https://github.com/wolfv6/keybrd_DH/blob/master/src/instantiations_scannersLEDs.h)<br>
 [instantiations_scancodes.h](https://github.com/wolfv6/keybrd_DH/blob/master/src/instantiations_scancodes.h)<br>
 [instantiations_layercodes.h](https://github.com/wolfv6/keybrd_DH/blob/master/src/instantiations_layercodes.h)<br>
 [instantiations_rows_L.h](https://github.com/wolfv6/keybrd_DH/blob/master/src/instantiations_rows_L.h)<br>
diff --git a/library.properties b/library.properties
index 2c3f84c..b87c0dc 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=keybrd
-version=0.5.0
+version=0.6.1
 author=Wolfram Volpi
 maintainer=Wolfram Volpi
 sentence=A library for creating custom-keyboard firmware.
diff --git a/src/Scanner_IOE.cpp b/src/Scanner_IOE.cpp
index dd4d9d6..ca02d2f 100644
--- a/src/Scanner_IOE.cpp
+++ b/src/Scanner_IOE.cpp
@@ -13,8 +13,8 @@ Initiates communication protocal and configs ports.
 void Scanner_IOE::begin()
 {
     refPortWrite.beginProtocol();
-    refPortWrite.begin(strobeOn);
-    refPortRead.begin(strobeOn);
+    refPortWrite.begin(activeState);
+    refPortRead.begin(activeState);
 }
 
 /* scan() is called on every iteration of sketch loop().
@@ -26,16 +26,16 @@ 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, strobeOn);
+    refPortWrite.write(strobePin, activeState);
     delayMicroseconds(3);                       //time to stabilize voltage
 
     //read the port pins
     readState = refPortRead.read();
 
     //strobe off
-    refPortWrite.write(strobePin, strobeOff);
+    refPortWrite.write(strobePin, !activeState);
 
-    if (strobeOn == LOW)                        //if active low
+    if (activeState == LOW)                     //if active low
     {
         readState = ~readState;
     }
diff --git a/src/Scanner_IOE.h b/src/Scanner_IOE.h
index 3350edf..21c871f 100644
--- a/src/Scanner_IOE.h
+++ b/src/Scanner_IOE.h
@@ -16,15 +16,12 @@ keybrd_library_developer_guide.md has instructions for ## Active state and diode
 class Scanner_IOE : public ScannerInterface
 {
     private:
-        const bool strobeOn;                    //logic level of strobe on, HIGH or LOW
-        const bool strobeOff;                   //logic level of strobe off, complement of strobeOn
+        const bool activeState;                    //logic level of strobe on, HIGH or LOW
         PortInterface& refPortWrite;            //the IC port containing the strobePin
         PortInterface& refPortRead;             //the IC's read port
     public:
-        Scanner_IOE(const bool strobeOn,
-                    PortInterface &refPortWrite, PortInterface& refPortRead)
-            : strobeOn(strobeOn), strobeOff(!strobeOn),
-              refPortWrite(refPortWrite), refPortRead(refPortRead) {}
+        Scanner_IOE(const bool activeState, PortInterface &refPortWrite, PortInterface& refPortRead)
+            : activeState(activeState) refPortWrite(refPortWrite), refPortRead(refPortRead) {}
         void init(const uint8_t strobePin);
         void begin();
         read_pins_t scan(const uint8_t strobePin);
diff --git a/src/Scanner_ShiftRegsRead.cpp b/src/Scanner_ShiftRegsRead.cpp
index 5956165..a25aabf 100644
--- a/src/Scanner_ShiftRegsRead.cpp
+++ b/src/Scanner_ShiftRegsRead.cpp
@@ -1,9 +1,9 @@
 #include "Scanner_ShiftRegsRead.h"
 
 /* constructor
-Parameter strobeOn is not used.
+Parameter activeState is not used.
 */
-Scanner_ShiftRegsRead::Scanner_ShiftRegsRead(const bool strobeOn,
+Scanner_ShiftRegsRead::Scanner_ShiftRegsRead(const bool activeState,
         const uint8_t slaveSelect, const uint8_t byte_count)
     : slaveSelect(slaveSelect), byte_count(byte_count)
 {
diff --git a/src/Scanner_ShiftRegsRead.h b/src/Scanner_ShiftRegsRead.h
index 7f1060f..d531e03 100644
--- a/src/Scanner_ShiftRegsRead.h
+++ b/src/Scanner_ShiftRegsRead.h
@@ -20,7 +20,7 @@ Example instantiation:
 In the above Row instantiation, argument 0 for "strobePin" is ignored because there is no strobe.
 
 There are three Scanner_ShiftRegsRead parameters.
-1. "strobeOn" paramter is ignored, but should be active state HIGH or LOW for ScannerInterface.
+1. "activeState" paramter is ignored, but should be active state HIGH or LOW for ScannerInterface.
 2. "slaveSelect" paramter can be any controller pin connected to shift register's SHIFT-LOAD pin.
 3. "byte_count" is the number of bytes to read from shift registers (1 to 4).
    byte_count should cover all the row's keys: byte_count*8 >= row's keyCount
@@ -54,7 +54,7 @@ class Scanner_ShiftRegsRead : public ScannerInterface
         const uint8_t slaveSelect;//controller pin number connected to shift register SHIFT-LOAD pin
         const uint8_t byte_count;               //number of bytes to read from shift registers
     public:
-        Scanner_ShiftRegsRead(const bool strobeOn,
+        Scanner_ShiftRegsRead(const bool activeState,
                                        const uint8_t slaveSelect, const uint8_t byte_count);
         void init(const uint8_t strobePin);
         void begin();
diff --git a/src/Scanner_ShiftRegsReadStrobed.cpp b/src/Scanner_ShiftRegsReadStrobed.cpp
index c58915f..2e0e989 100644
--- a/src/Scanner_ShiftRegsReadStrobed.cpp
+++ b/src/Scanner_ShiftRegsReadStrobed.cpp
@@ -1,8 +1,8 @@
 #include "Scanner_ShiftRegsReadStrobed.h"
 
-Scanner_ShiftRegsReadStrobed::Scanner_ShiftRegsReadStrobed(const bool strobeOn,
+Scanner_ShiftRegsReadStrobed::Scanner_ShiftRegsReadStrobed(const bool activeState,
         const uint8_t slaveSelect, const uint8_t byte_count)
-    : strobeOn(strobeOn), strobeOff(!strobeOn),
+    : activeState(activeState),
       slaveSelect(slaveSelect), byte_count(byte_count)
 {
     pinMode(slaveSelect, OUTPUT);
@@ -44,7 +44,7 @@ read_pins_t Scanner_ShiftRegsReadStrobed::scan(const uint8_t strobePin)
 {
     read_pins_t readState = 0;                  //bits, 1 means key is pressed, 0 means released
 
-    digitalWrite(strobePin, strobeOn);          //strobe on
+    digitalWrite(strobePin, activeState);       //strobe on
 
     //SPI.beginTransaction( SPISettings(5000000, MSBFIRST, SPI_MODE0) ); //control SPI bus, 5 MHz
 
@@ -53,7 +53,7 @@ read_pins_t Scanner_ShiftRegsReadStrobed::scan(const uint8_t strobePin)
 
     digitalWrite(slaveSelect, HIGH);            //shift the data toward a serial output
 
-    digitalWrite(strobePin, strobeOff);         //strobe off
+    digitalWrite(strobePin, !activeState);      //strobe off to preserv IR LED life
 
     SPI.transfer(&readState, byte_count);
 
diff --git a/src/Scanner_ShiftRegsReadStrobed.h b/src/Scanner_ShiftRegsReadStrobed.h
index 17db711..3d7f767 100644
--- a/src/Scanner_ShiftRegsReadStrobed.h
+++ b/src/Scanner_ShiftRegsReadStrobed.h
@@ -19,7 +19,7 @@ Example instantiation:
     Scanner_ShiftRegsReadStrobed scanner_R(HIGH, 6, 4);
 
 There are three Scanner_ShiftRegsReadStrobed parameters.
-1. "strobeOn" paramter is active state HIGH or LOW.
+1. "activeState" paramter is active state HIGH or LOW.
 2. "slaveSelect" paramter is controller pin connected to shift register's SHIFT-LOAD pin.
 3. "byte_count" is the number of bytes to read from shift registers (1 to 4).
    byte_count should cover all the row's keys: byte_count*8 >= row's keyCount
@@ -48,12 +48,11 @@ If multiple rows (or any SPI divice) share a MISO line, the shift registers need
 class Scanner_ShiftRegsReadStrobed : public ScannerInterface
 {
     private:
-        const bool strobeOn;                    //logic level of strobe on, active state HIGH or LOW
-        const bool strobeOff;                   //logic level of strobe off, complement of strobeOn
+        const bool activeState;                 //logic level of strobe on, active state HIGH or LOW
         const uint8_t slaveSelect;//controller pin number connected to shift register SHIFT-LOAD pin
         const uint8_t byte_count;               //number of bytes to read from shift registers
     public:
-        Scanner_ShiftRegsReadStrobed(const bool strobeOn,
+        Scanner_ShiftRegsReadStrobed(const bool activeState,
                                       const uint8_t slaveSelect, const uint8_t byte_count);
         virtual void init(const uint8_t strobePin);
         virtual void begin();
diff --git a/src/Scanner_uC.cpp b/src/Scanner_uC.cpp
index b22c4a6..8de55e6 100644
--- a/src/Scanner_uC.cpp
+++ b/src/Scanner_uC.cpp
@@ -10,13 +10,13 @@ https://www.arduino.cc/en/Reference/Constants > Digital Pins modes: INPUT, INPUT
 
 /* constructor
 */
-Scanner_uC::Scanner_uC(const bool strobeOn, const uint8_t readPins[], const uint8_t readPinCount)
-    : strobeOn(strobeOn), strobeOff(!strobeOn), readPins(readPins), readPinCount(readPinCount)
+Scanner_uC::Scanner_uC(const bool activeState, const uint8_t readPins[], const uint8_t readPinCount)
+    : activeState(activeState), readPins(readPins), readPinCount(readPinCount)
 {
     uint8_t mode;
 
     //configure read pins
-    if (strobeOn == LOW)                        //if active low
+    if (activeState == LOW)                     //if active low
     {
         mode = INPUT_PULLUP;                    //use internal pull-up resistor
     }
@@ -48,22 +48,22 @@ read_pins_t Scanner_uC::scan(const uint8_t strobePin)
     read_pins_t readState = 0;                  //bits, 1 means key is pressed, 0 means released
     read_pins_t readMask = 1;                   //bits, active bit is 1
 
-    //strobe row on
-    digitalWrite(strobePin, strobeOn);
+    //strobe on
+    digitalWrite(strobePin, activeState);
     delayMicroseconds(3);                       //time to stablize voltage
 
     //read all the read pins
     for (uint8_t i=0; i < readPinCount; i++)
     {
-        if ( digitalRead(readPins[i]) == strobeOn )
+        if ( digitalRead(readPins[i]) == activeState )
         {
             readState |= readMask;
         }
         readMask <<= 1;
     }
 
-    //strobe row off
-    digitalWrite(strobePin, strobeOff);
+    //strobe off
+    digitalWrite(strobePin, !activeState);
 
     return readState;
 }
diff --git a/src/Scanner_uC.h b/src/Scanner_uC.h
index 5ed8cf2..9c14ac3 100644
--- a/src/Scanner_uC.h
+++ b/src/Scanner_uC.h
@@ -12,12 +12,11 @@ Limit number of readPins to size of read_pins_t, which is defined in config_keyb
 class Scanner_uC : public ScannerInterface
 {
     private:
-        const bool strobeOn;                    //logic level of strobe on, HIGH or LOW
-        const bool strobeOff;                   //logic level of strobe off, complement of strobeOn
+        const bool activeState;                    //logic level of strobe on, HIGH or LOW
         const uint8_t* const readPins;          //array of read pin numbers
         const uint8_t readPinCount;             //number of readPins
     public:
-        Scanner_uC(const bool strobeOn, const uint8_t readPins[], const uint8_t readPinCount);
+        Scanner_uC(const bool activeState, const uint8_t readPins[], const uint8_t readPinCount);
         void init(const uint8_t strobePin);
         virtual read_pins_t scan(const uint8_t strobePin);
 };