diff --git a/libraries/PinOutGroup/LICENSE b/libraries/PinOutGroup/LICENSE
new file mode 100644
index 00000000..ed401f22
--- /dev/null
+++ b/libraries/PinOutGroup/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2017-2020 Rob Tillaart
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/libraries/PinOutGroup/PinOutGroup.cpp b/libraries/PinOutGroup/PinOutGroup.cpp
index 2198f3f7..95eda8cb 100644
--- a/libraries/PinOutGroup/PinOutGroup.cpp
+++ b/libraries/PinOutGroup/PinOutGroup.cpp
@@ -1,50 +1,59 @@
 //
 //    FILE: PinOutGroup.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.0
+// VERSION: 0.1.1
 //    DATE: 2017-04-26
 // PURPOSE: PinOutGroup library for Arduino
 //          goal is to easily change a group of pins that logically 
 //          belong to each other e.g. 8 data pins of a parallel printer.
 //          these pins can be in any order.
-//     URL: http://forum.arduino.cc/index.php?topic=469599.0
+//     URL: 
+//          http://forum.arduino.cc/index.php?topic=469599.0
 //
-// Released to the public domain
-//
-// 0.1.0 - initial version (based upon experimental pinGroup)
+
+// 0.1.0 - 20-08-2017 initial version (based upon experimental pinGroup)
+// 0.1.1 - 2020-05-19 main refactor; 
+//         added tests; added clear(); added write(idx, value)
+//         renamed set to write() to be in line with digitalWrite()
+//         
 // 
 
 #include "PinOutGroup.h"
 
 PinOutGroup::PinOutGroup()
 {
+  clear();
+}
+
+void PinOutGroup::clear()
+{
+  // safety: set all to LOW before cleaning up.
+  for (uint8_t i = 0; i < _size; i++) digitalWrite(_pins[i], LOW);
   _size = 0;
 }
 
-bool PinOutGroup::add(uint8_t s, int* ar, uint8_t value) // value = HIGH LOW
+bool PinOutGroup::add(uint8_t sz, uint8_t* ar, uint8_t value)
 {
   bool b = true;
-  for (uint8_t i = 0; i < s; i++) 
+  for (uint8_t i = 0; i < sz && b; i++) 
   {
     b = b && add(ar[i], value);
   }
   return b;
 }
 
-bool PinOutGroup::add(uint8_t pin, uint8_t value)  // value = HIGH LOW
+bool PinOutGroup::add(uint8_t pin, uint8_t value)
 {
-  if (_size < PINOUTGROUP_MAXSIZE)
-  {
-    _pins[_size] = pin;                   // BUG pin can be added multiple time.
-    pinMode(pin, OUTPUT);
-    digitalWrite(pin, value);
-    _size++;
-    return true;
-  }
-  return false;
+  if (_size >= PINOUTGROUP_MAXSIZE) return false;
+
+  _pins[_size] = pin;
+  pinMode(pin, OUTPUT);
+  digitalWrite(pin, value);
+  _size++;
+  return true;
 }
 
-uint8_t PinOutGroup::set(uint16_t value)
+uint8_t PinOutGroup::write(uint16_t value)
 {
   uint16_t changed = _lastValue ^ value;    // detect pins that changed
   if (changed == 0) return 0;
@@ -63,5 +72,19 @@ uint8_t PinOutGroup::set(uint16_t value)
   _lastValue = value;
   return changeCount;
 }
+	
+uint8_t PinOutGroup::write(uint8_t idx, uint8_t value)
+{
+  if (idx >= _size) return 0;
+  uint16_t mask = (1 << idx);
+  uint16_t lv = _lastValue & mask;
 
-// --- END OF FILE ---
\ No newline at end of file
+  if ((value > 0) == (lv > 0)) return 0;  // no change
+
+  digitalWrite(_pins[idx], value);
+  if (value == LOW) _lastValue &= ~mask;
+  else _lastValue |= mask;
+  return 1;
+}
+
+// --- END OF FILE ---
diff --git a/libraries/PinOutGroup/PinOutGroup.h b/libraries/PinOutGroup/PinOutGroup.h
index f500b42c..34831f02 100644
--- a/libraries/PinOutGroup/PinOutGroup.h
+++ b/libraries/PinOutGroup/PinOutGroup.h
@@ -1,57 +1,55 @@
-#ifndef PINOUTGROUP_H
+#pragma once
 //    FILE: PinOutGroup.h
 //  AUTHOR: Rob dot Tillaart at gmail dot com
-// VERSION: 0.1.0
+// VERSION: 0.1.1
+//    DATE: 2017-04-26
 // PURPOSE: PinOutGroup library for Arduino
-// HISTORY: See pinGroup.cpp
-//
-// Released to the public domain
+// HISTORY: See PinOutGroup.cpp
 //
+
 #include "Arduino.h"
 
-#define PINOUTGROUP_LIB_VERSION "0.1.0"
+#define PINOUTGROUP_LIB_VERSION "0.1.1"
+
+// smaller MAXSIZE will reduce memory footprint with ditto bytes.
+#ifndef PINOUTGROUP_MAXSIZE
+#define PINOUTGROUP_MAXSIZE    16
+#endif           
 
-// PINOUTGROUP_MAXSIZE = 16 ==> max value, smaller will reduce memory footprint with ditto bytes.
-#define PINOUTGROUP_MAXSIZE      16             
 
-//
-// a pinGroup is a number of output pins that can be set by means of
-// one set command. The pinGroup remembers the last set value per pin
-// and will not do a digitalWrite() if the pin is already in the right
-// state. If a pin is updated often this can save some cpu cycles
-// however this feature has some overhead which is contra productive
-// when you toggle a group of pins. So use with care.
-//
-// <performance intermezzo>
-// On average 50% of the pins are in the right state (assumption) 
-// This means that of a set only half the pins are changed, so 50%
-// is the maximum theoretical gain we see on average.
-// In testruns a gain of 20-25% is seen but this really depends on
-// the data used. 
-// 
 class PinOutGroup
 {
 public:
   PinOutGroup();
   
-  // adds a predefined array of pinnumbers to the PinOutGroup
+  // enables one to reset at he pinGroup and repopulate it
+  void      clear();
+
+  // adds a predefined array of pin numbers to the PinOutGroup
   // sets all to (LOW, HIGH)
-  bool      add(uint8_t s, int* ar, uint8_t value = LOW);
+  bool      add(uint8_t sz, uint8_t* ar, uint8_t value = LOW);
+  
   // adds a single pin to the PinOutGroup, default to LOW.
   bool      add(uint8_t pin, uint8_t value = LOW);
 
   // set up to 16 pins "simultaneously" in one call.
-  uint8_t   set(uint16_t value);
+  uint8_t   write(uint16_t value);
+  
+  // write to a single pin while maintaining internal admin
+  uint8_t   write(uint8_t idx, uint8_t value);
+  
   // retrieve the last set value
-  uint16_t  get() { return _lastValue; };
-  // get the current size
+  uint16_t  read() { return _lastValue; };
+
   uint8_t   size() { return _size; };
+
   // check how many free "slots" there are...
   uint8_t   free() { return PINOUTGROUP_MAXSIZE - _size; };
 
 private:
   uint16_t  _lastValue = 0;
-  uint8_t   _pins[PINOUTGROUP_MAXSIZE];    // should be malloced dynamically
+  uint8_t   _pins[PINOUTGROUP_MAXSIZE];
   uint8_t   _size = 0;
 };
-#endif
+
+// -- END OF FILE --
diff --git a/libraries/PinOutGroup/README.md b/libraries/PinOutGroup/README.md
new file mode 100644
index 00000000..c05fee8c
--- /dev/null
+++ b/libraries/PinOutGroup/README.md
@@ -0,0 +1,43 @@
+# PinOutGroup
+
+Arduino library to group up to 16 outputs into one command
+
+# Description
+
+A PinOutGroup is a number of output pins that can be set by means of one **write()** command.
+The PinOutGroup remembers the last values set per pin and will not do a digitalWrite()
+if the pin is already in the right state. Think of it as caching the state.
+
+If a (group of) pin(s) is updated often this saves cpu cycles however this feature 
+has overhead which works contra productive when you toggle the pins in a group. So use with care.
+
+### performance intermezzo
+Assume that on average 50% of the pins are in the right state in a group. 
+This means that on average half the pins are actually changed. By bypassing
+the (relative) expensive **digitalWrite()** time is gained. 
+
+Actual performance gains depends very much on the data written. 
+It is worth to do a small investigation for this. See e.g. 7 segment demo.
+
+### interface
+
+**clear()** resets all pins in the group to LOW and sets the size ot zero
+so one can repopulate.
+
+**add()** adds a predefined array of pin numbers of a single pin to the group.
+
+**write(value)** writes a 16 bits unsigned int to max 16 pins.
+
+**write(idx, value)** sets a single pin of the internal array withindex 
+idx to value. This one is faster than writing to the whole group for a single
+change. The user must keep track of the right index nr.
+
+**read()** reads back the last written value to the pins as an unsigend int.
+
+**size()** and **free()** give information about the group.
+
+
+# Operation
+
+See examples
+
diff --git a/libraries/PinOutGroup/examples/led13/led13.ino b/libraries/PinOutGroup/examples/led13/led13.ino
new file mode 100644
index 00000000..2135e049
--- /dev/null
+++ b/libraries/PinOutGroup/examples/led13/led13.ino
@@ -0,0 +1,38 @@
+//    FILE: led13.ino
+//  AUTHOR: Rob dot Tillaart at gmail dot com
+// VERSION: 0.1.0
+// PURPOSE: demo pinGroup library for Arduino
+//          blink the build in led by means of a PinOutGroup
+
+#include "PinOutGroup.h"
+
+PinOutGroup led13;
+
+uint8_t ar[1] = { 13 } ;
+
+uint32_t start , stop;
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println(__FILE__);
+  Serial.print(F("PINOUTGROUP_LIB_VERSION: "));
+  Serial.println(PINOUTGROUP_LIB_VERSION);
+
+  led13.add(1, ar );
+}
+
+void loop()
+{
+  Serial.println();
+  start = micros();
+  led13.write(0, HIGH);  // could be led13.write(1); as there is just one in the group.
+  stop = micros();
+  Serial.println(stop - start);
+  delay(250);
+
+  led13.write(0, LOW);  // could be led13.write(0); as there is just one in the group.
+  delay(250);
+}
+
+// -- END OF FILE --
diff --git a/libraries/PinOutGroup/examples/sevenSegment/sevenSegment.ino b/libraries/PinOutGroup/examples/sevenSegment/sevenSegment.ino
new file mode 100644
index 00000000..1f3f507a
--- /dev/null
+++ b/libraries/PinOutGroup/examples/sevenSegment/sevenSegment.ino
@@ -0,0 +1,82 @@
+//    FILE: sevenSegment.ino
+//  AUTHOR: Rob dot Tillaart at gmail dot com
+// VERSION: 0.1.0
+// PURPOSE: demo PinOutGroup library for Arduino
+//
+
+#include "PinOutGroup.h"
+
+// connect arduino pins 2.. 8 to pins A..G of a 7 segments display
+
+uint8_t ar[7] = {2, 3, 4, 5, 6, 7, 8};
+
+int ssc[16] = // seven segment char
+{
+  63, 6, 91, 79, 102, 109, 125, 7, 127, 111,  // 0 .. 9
+  119, 124, 57, 94, 121, 113                  // A .. F
+};
+
+PinOutGroup display;
+
+uint32_t start, stop, t1, t2;
+
+void setup()
+{ 
+  Serial.begin(115200);
+  Serial.println(__FILE__);
+  Serial.print(F("PINOUTGROUP_LIB_VERSION: "));
+  Serial.println(PINOUTGROUP_LIB_VERSION);
+  Serial.println();
+
+  Serial.println("Without PinOutGroup");
+  delay(10);
+  start = micros();
+  for (int i = 0; i < 16; i++)
+  {
+    digitalWrite(2, ssc[i] & 0x01);
+    digitalWrite(3, ssc[i] & 0x02);
+    digitalWrite(4, ssc[i] & 0x04);
+    digitalWrite(5, ssc[i] & 0x08);
+    digitalWrite(6, ssc[i] & 0x10);
+    digitalWrite(7, ssc[i] & 0x20);
+    digitalWrite(8, ssc[i] & 0x40);
+  }
+  stop = micros();  
+  Serial.println("cycling through 16 chars");
+  Serial.print("Time: ");
+  t1 = stop - start;
+  Serial.println(stop - start);
+  Serial.println();
+  delay(10);
+
+  Serial.println("With PinOutGroup");
+  delay(10);
+  display.add(7, ar);
+  
+  start = micros();
+  for (int i = 0; i < 16; i++)
+  {
+    display.write(ssc[i]);
+  }
+  stop = micros();  
+  Serial.println("cycling through 16 chars");
+  Serial.print("Time: ");
+  t2 = stop - start;
+  Serial.println(stop - start);
+  Serial.println();
+  
+  Serial.print(" %: ");
+  Serial.println((1.0 * t2)/ t1);
+  Serial.println();
+}
+
+void loop()
+{
+  for (int i = 0; i < 16; i++)
+  {
+    display.write(ssc[i]);
+    delay(250);
+  }
+}
+
+// -- END OF FILE --
\ No newline at end of file
diff --git a/libraries/PinOutGroup/examples/testPinOutGroup/testPinOutGroup.ino b/libraries/PinOutGroup/examples/testPinOutGroup/testPinOutGroup.ino
index 1f92739e..701f082f 100644
--- a/libraries/PinOutGroup/examples/testPinOutGroup/testPinOutGroup.ino
+++ b/libraries/PinOutGroup/examples/testPinOutGroup/testPinOutGroup.ino
@@ -1,20 +1,18 @@
 //    FILE: testPinOutGroup.ino
 //  AUTHOR: Rob dot Tillaart at gmail dot com
-// VERSION: 0.1.0
+// VERSION: 0.1.1
 // PURPOSE: demo PinOutGroup library for Arduino
-// HISTORY:
-//
-// Released to the public domain
 //
 
 #include "PinOutGroup.h"
 
-int ar[4] = {2, 3, 4, 13};
+uint8_t ar[4] = {2, 3, 4, 13};
 
 void setup()
 {
   Serial.begin(115200);
-  Serial.print("PINOUTGROUP_LIB_VERSION: ");
+  Serial.println(__FILE__);
+  Serial.print(F("PINOUTGROUP_LIB_VERSION: "));
   Serial.println(PINOUTGROUP_LIB_VERSION);
 
   test0();
@@ -27,16 +25,18 @@ void setup()
   test7();
   test8();
 
-  Serial.println("done...");
+  Serial.println(F("done..."));
 }
 
 void loop()
 {
 }
 
-// TEST1 verifies and times basic working
 void test0()
 {
+  Serial.println(__FUNCTION__);
+  Serial.println(F("Time reference functionality.\n"));
+
   int i = 3;
   // CHANGE 1 PINS
   pinMode(2, OUTPUT);
@@ -47,14 +47,17 @@ void test0()
   digitalWrite(2, i++ % 2);
   uint32_t t2 = micros();
 
+  Serial.print(F("Time: "));
   Serial.println(t2 - t1);
-  Serial.println("Test0 done...");
+  Serial.print(__FUNCTION__);
+  Serial.println(F(" done..."));
   Serial.println();
 }
 
-
 void test1()
 {
+  Serial.println(__FUNCTION__);
+  Serial.println(F("Time to change # pins.\n"));
   uint8_t n1, n2, n3, n4;
   PinOutGroup POG;
   POG.add(2);
@@ -62,31 +65,32 @@ void test1()
   POG.add(5);
   POG.add(13);
 
-  Serial.print("size: ");
+  Serial.print(F("size: "));
   Serial.println(POG.size());
 
+  Serial.println("\n#PINS\tTIME");
   // CHANGE 1 PINS
   uint32_t t1 = micros();
-  n1 = POG.set(B1000);
+  n1 = POG.write(B1000);
   uint32_t t2 = micros();
 
   // CHANGE 2 PINS
   uint32_t t3 = micros();
-  n2 = POG.set(B0100);
+  n2 = POG.write(B0100);
   uint32_t t4 = micros();
 
   // CHANGE 3 PINS
   uint32_t t5 = micros();
-  n3 = POG.set(B1010);
+  n3 = POG.write(B1010);
   uint32_t t6 = micros();
 
   // CHANGE 4 PINS
   uint32_t t7 = micros();
-  n4 = POG.set(B0101);
+  n4 = POG.write(B0101);
   uint32_t t8 = micros();
 
   // RESET ALL
-  POG.set(B0000);
+  POG.write(B0000);
 
   Serial.print(n1);
   Serial.print('\t');
@@ -100,13 +104,18 @@ void test1()
   Serial.print(n4);
   Serial.print('\t');
   Serial.println(t8 - t7);
-  Serial.println("Test1 done...");
+
+  Serial.print(__FUNCTION__);
+  Serial.println(F(" done..."));
   Serial.println();
 }
 
-// TEST2 tests if a set() always matches a subsequent get().
 void test2()
 {
+  Serial.println(__FUNCTION__);
+  Serial.println(F("Does write() match subsequent read()."));
+  Serial.println(F("No output is good!\n"));
+
   PinOutGroup POG;
   POG.add(2);
   POG.add(4);
@@ -119,73 +128,94 @@ void test2()
 
   for (int i = 0; i < 256; i++)
   {
-    POG.set(i);
-    int x = POG.get();
-    if (x != i) Serial.println("fail test 2");
+    POG.write(i);
+    int x = POG.read();
+    if (x != i)
+    {
+      Serial.print("failed value: ");
+      Serial.println(i);
+    }
   }
-  Serial.println("Test2 done...");
+
+  Serial.print(__FUNCTION__);
+  Serial.println(F(" done..."));
   Serial.println();
 }
 
-// TEST3 tests the adding of an array of pins
 void test3()
 {
+  Serial.println(__FUNCTION__);
+  Serial.println(F("Test adding an array of pins."));
+
   PinOutGroup POG;
   POG.add(4, ar );
-  Serial.print("size: ");
+  Serial.print(F("size: "));
   Serial.println(POG.size());
-  Serial.println("Test3 done...");
+  POG.add(4, ar );
+  Serial.print(F("size: "));
+  Serial.println(POG.size());
+
+  Serial.print(__FUNCTION__);
+  Serial.println(F(" done..."));
   Serial.println();
 }
 
-
-// TEST 4 shows that a pin can be added multiple times
 void test4()
 {
+  Serial.println(__FUNCTION__);
+  Serial.println(F("Test adding a pin multiple times.\n"));
+
   PinOutGroup POG;
+  Serial.print(F("size: "));
+  Serial.println(POG.size());
   for (int i = 0; i < 8; i++)
   {
     POG.add(13);
+    Serial.print(F("size: "));
+    Serial.println(POG.size());
   }
-  POG.set(B01010101);
-  Serial.print("size: ");
-  Serial.println(POG.size());
-  Serial.println("Test4 done...");
+  POG.write(B01010101);
+
+  Serial.print(__FUNCTION__);
+  Serial.println(F(" done..."));
   Serial.println();
 }
 
-
-// TEST 5 simulates a LCD display
 void test5()
 {
+  Serial.println(__FUNCTION__);
+  Serial.println(F("Simulates a 8 bit channel to LCD display.\n"));
+
   PinOutGroup POG;
   POG.add(4, ar);
   POG.add(4, ar);
-  Serial.print("size: ");
+  Serial.print(F("size: "));
   Serial.println(POG.size());
   int cnt = 0;
   char str[] = "Hello world. This is a test. The quick brown fox jumps over the lazy dog!";
-  for (uint8_t i = 0; i < strlen(str); i++)
+  int len = strlen(str);
+  for (uint8_t i = 0; i < len; i++)
   {
-    cnt += POG.set((uint8_t)str[i]);
+    cnt += POG.write((uint8_t)str[i]);
   }
-  Serial.print(" Printing: ");
+  Serial.print(F("  Printing: "));
   Serial.println(str);
-  Serial.print("     Bits: ");
-  Serial.println(strlen(str) * 8);         
-  Serial.print("  Changed: ");
-  Serial.println(cnt);         
-  Serial.print("      AVG: ");
-  Serial.println(1.0 * cnt / (strlen(str) * 8), 3);
-  Serial.println("Test5 done...");
-  Serial.println("footnote: test 5 uses ascii that only change in 5-6 bits max, which decreases the average");
-  Serial.println("          That said, it is a real life application e.g. updating an LCD screen.");
+  Serial.print(F("Bits total: "));
+  Serial.println(strlen(str) * 8);
+  Serial.print(F("   Changed: "));
+  Serial.println(cnt);
+  Serial.print(F("     ratio: "));
+  Serial.println(1.0 * cnt / (len * 8), 3);
+  Serial.println();
+  Serial.println(F("footnote: test 5 uses ascii that only change in 5-6 bits max, which decreases the average"));
+  Serial.println(F("          That said, it is a real life application e.g. updating an LCD screen."));
+
+  Serial.print(__FUNCTION__);
+  Serial.println(F(" done..."));
   Serial.println();
 }
 
-//
-// wrapper for test 6
-//
+// wrapper for test6()
 void dw(const uint8_t pin, const uint8_t val)
 {
   static uint8_t preVal = -1;
@@ -196,10 +226,11 @@ void dw(const uint8_t pin, const uint8_t val)
   }
 }
 
-
-// TEST6 checks if cache trick works for digitalWrite too
 void test6()
 {
+  Serial.println(__FUNCTION__);
+  Serial.println(F("Check if cache trick works for digitalWrite.\n"));
+
   uint8_t a[1000];
   randomSeed(1);
   for (int i = 0; i < 1000; i++) a[i] = random(2);
@@ -219,67 +250,78 @@ void test6()
   }
   uint32_t t4 = micros();
 
-  Serial.println("random: average case");
-  Serial.print("ORG: ");
+  Serial.println(F("random: average case"));
+  Serial.print(F("ORG: "));
   Serial.println(t2 - t1);
-  Serial.print("NEW: ");
+  Serial.print(F("NEW: "));
   Serial.println(t4 - t3);
+  Serial.print(F("  %: "));
+  Serial.println(1.0 * (t4 - t3) / (t2 - t1));
+  Serial.println();
 
-  uint32_t t5 = micros();
+  t1 = micros();
   for (int i = 0; i < 1000; i++)
   {
     digitalWrite(2, LOW);
   }
-  uint32_t t6 = micros();
+  t2 = micros();
 
-  uint32_t t7 = micros();
+  t3 = micros();
   for (int i = 0; i < 1000; i++)
   {
     dw(2, LOW);
   }
-  uint32_t t8 = micros();
+  t4 = micros();
 
-  Serial.println("same: best case");
-  Serial.print("ORG: ");
-  Serial.println(t6 - t5);
-  Serial.print("NEW: ");
-  Serial.println(t8 - t7);
+  Serial.println(F("same: best case"));
+  Serial.print(F("ORG: "));
+  Serial.println(t2 - t1);
+  Serial.print(F("NEW: "));
+  Serial.println(t4 - t3);
+  Serial.print(F("  %: "));
+  Serial.println(1.0 * (t4 - t3) / (t2 - t1));
+  Serial.println();
 
-  t5 = micros();
+  t1 = micros();
   for (int i = 0; i < 1000; i++)
   {
     digitalWrite(2, i % 2);
   }
-  t6 = micros();
+  t2 = micros();
 
-  t7 = micros();
+  t3 = micros();
   for (int i = 0; i < 1000; i++)
   {
     dw(2, i % 2);
   }
-  t8 = micros();
+  t4 = micros();
 
-  Serial.println("toggle: worst case");
-  Serial.print("ORG: ");
-  Serial.println(t6 - t5);
-  Serial.print("NEW: ");
-  Serial.println(t8 - t7);
+  Serial.println(F("toggle: worst case"));
+  Serial.print(F("ORG: "));
+  Serial.println(t2 - t1);
+  Serial.print(F("NEW: "));
+  Serial.println(t4 - t3);
+  Serial.print(F("  %: "));
+  Serial.println(1.0 * (t4 - t3) / (t2 - t1));
+  Serial.println();
 
-  Serial.println("Test6 done...");
+  Serial.print(__FUNCTION__);
+  Serial.println(F(" done..."));
   Serial.println();
 }
 
-
-// TEST7 tests average gain
 void test7()
 {
+  Serial.println(__FUNCTION__);
+  Serial.println(F("Test average gain indication (simplified).\n"));
+
   PinOutGroup POG;
   // effectively 16 pins...
   POG.add(4, ar);
   POG.add(4, ar);
   POG.add(4, ar);
   POG.add(4, ar);
-  
+
   uint8_t a[1000];
   randomSeed(1);
   for (int i = 0; i < 1000; i++) a[i] = random(32768);
@@ -297,38 +339,45 @@ void test7()
   uint32_t t3 = micros();
   for (int i = 0; i < 1000; i++)
   {
-    POG.set(a[i]);
+    POG.write(a[i]);
   }
   uint32_t t4 = micros();
 
-  Serial.println("1000x random bit: average case");
-  Serial.print("ORG: ");
+  Serial.println(F("1000x random bit: average case"));
+  Serial.print(F("ORG: "));
   Serial.println(t2 - t1);
-  Serial.print("NEW: ");
+  Serial.print(F("NEW: "));
   Serial.println(t4 - t3);
+  Serial.print(F("  %: "));
+  Serial.println(1.0 * (t4 - t3) / (t2 - t1));
+  Serial.println();
 
-  Serial.println("Test7 done...");
+  Serial.print(__FUNCTION__);
+  Serial.println(F(" done..."));
   Serial.println();
 }
 
-// TEST8 tests free() 
 void test8()
 {
+  Serial.println(__FUNCTION__);
+  Serial.println(F("Test Free()...\n"));
+
   PinOutGroup POG;
-  Serial.print("size: ");
+  Serial.print(F("size: "));
   Serial.println(POG.size());
-  Serial.print("free: ");
+  Serial.print(F("free: "));
   Serial.println(POG.free());
-  
+
   POG.add(4, ar );
-  
-  Serial.print("size: ");
+
+  Serial.print(F("size: "));
   Serial.println(POG.size());
-  Serial.print("free: ");
+  Serial.print(F("free: "));
   Serial.println(POG.free());
-  
-  Serial.println("Test8 done...");
+
+  Serial.print(__FUNCTION__);
+  Serial.println(F(" done..."));
   Serial.println();
 }
 
-// END OF FILE
\ No newline at end of file
+// -- END OF FILE --
diff --git a/libraries/PinOutGroup/examples/trafficLight/trafficLight.ino b/libraries/PinOutGroup/examples/trafficLight/trafficLight.ino
new file mode 100644
index 00000000..757a514d
--- /dev/null
+++ b/libraries/PinOutGroup/examples/trafficLight/trafficLight.ino
@@ -0,0 +1,56 @@
+//    FILE: trafficLight.ino
+//  AUTHOR: Rob dot Tillaart at gmail dot com
+// VERSION: 0.1.0
+// PURPOSE: demo PinOutGroup library for Arduino
+//
+
+#include "PinOutGroup.h"
+
+PinOutGroup trafficLight;
+
+uint8_t lights[] = {11, 12, 13};  // connect 3 leds...
+const int RED    = 4;
+const int YELLOW = 2;
+const int GREEN  = 1;
+const int YELLOWRED = 6;
+
+int state = 0;
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println(__FILE__);
+  Serial.print(F("PINOUTGROUP_LIB_VERSION: "));
+  Serial.println(PINOUTGROUP_LIB_VERSION);
+  Serial.println();
+
+  trafficLight.add(3, lights);
+}
+
+void loop()
+{
+  switch (state)
+  {
+    default:
+      Serial.println("RED");
+      trafficLight.write(RED);
+      break;
+    case 1:
+      Serial.println("YELLOWRED");
+      trafficLight.write(YELLOWRED);
+      break;
+    case 2:
+      Serial.println("GREEN");
+      trafficLight.write(GREEN);
+      break;
+    case 3:
+      Serial.println("YELLOW");
+      trafficLight.write(YELLOW);
+      break;
+  }
+  state++;
+  if (state == 4) state = 0;
+  delay(1000);
+}
+
+// -- END OF FILE --
diff --git a/libraries/PinOutGroup/library.json b/libraries/PinOutGroup/library.json
index b2f018af..e231e3bc 100644
--- a/libraries/PinOutGroup/library.json
+++ b/libraries/PinOutGroup/library.json
@@ -1,6 +1,6 @@
 {
   "name": "PinOutGroup",
-  "keywords": "PinOutGroup,pin,group",
+  "keywords": "PinOutGroup, pin, group, OUTPUT",
   "description": "A class that groups output pins so they can be updated easier and slightly faster on average",
   "authors":
   [
@@ -13,12 +13,12 @@
   "repository":
   {
     "type": "git",
-    "url": "https://github.com/RobTillaart/Arduino.git"
+    "url": "https://github.com/RobTillaart/PinOutGroup.git"
   },
-  "version":"0.1.0",
+  "version":"0.1.1",
   "frameworks": "arduino",
   "platforms": "*",
   "export": {
-    "include": "libraries/PinOutGroup
+    "include": "PinOutGroup
   }
 }
diff --git a/libraries/PinOutGroup/library.properties b/libraries/PinOutGroup/library.properties
index b279b774..4f241fee 100644
--- a/libraries/PinOutGroup/library.properties
+++ b/libraries/PinOutGroup/library.properties
@@ -1,9 +1,11 @@
 name=PinOutGroup
-version=0.1.0
+version=0.1.1
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
-sentence=A class that groups output pins so they can be updates easier and slightly faster on average.
+sentence=A class that groups output pins so they can be updated easier and slightly faster on average.
 paragraph= 
-category=Uncategorized
-url=https://github.com/RobTillaart/Arduino/tree/master/libraries
-architectures=*
\ No newline at end of file
+category=Communication
+url=https://github.com/RobTillaart/PinOutGroup.git
+architectures=*
+includes=PinOutGroup.h
+depends=