Explicit pin usage

Like requested in https://github.com/arduino/Arduino/issues/5455

examples/Autoscroll/Autoscroll.ino

@@ -29,18 +29,22 @@
  by Tom Igoe
  modified 22 Nov 2010
  by Tom Igoe
+ modified 7 Nov 2016
+ by Arturo Guadalupi
 
  This example code is in the public domain.
 
  http://www.arduino.cc/en/Tutorial/LiquidCrystalAutoscroll
 
- */
+*/
 
 // include the library code:
 #include <LiquidCrystal.h>
 
 // initialize the library with the numbers of the interface pins
-LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
+// initialize the library with the arduino pin numbers of the LCD interface pins
+const int rs=12, en=11, d4=5, d5=4, d6=3, d7=2;
+LiquidCrystal lcd(rs,en,d4,d5,d6,d7);
 
 void setup() {
   // set up the LCD's number of columns and rows:

examples/Blink/Blink.ino

@@ -29,18 +29,22 @@
  by Tom Igoe
  modified 22 Nov 2010
  by Tom Igoe
+ modified 7 Nov 2016
+ by Arturo Guadalupi
 
  This example code is in the public domain.
 
  http://www.arduino.cc/en/Tutorial/LiquidCrystalBlink
 
- */
+*/
 
 // include the library code:
 #include <LiquidCrystal.h>
 
 // initialize the library with the numbers of the interface pins
-LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
+// initialize the library with the arduino pin numbers of the LCD interface pins
+const int rs=12, en=11, d4=5, d5=4, d6=3, d7=2;
+LiquidCrystal lcd(rs,en,d4,d5,d6,d7);
 
 void setup() {
   // set up the LCD's number of columns and rows:

examples/Cursor/Cursor.ino

@@ -30,18 +30,22 @@
  by Tom Igoe
  modified 22 Nov 2010
  by Tom Igoe
+ modified 7 Nov 2016
+ by Arturo Guadalupi
 
  This example code is in the public domain.
 
  http://www.arduino.cc/en/Tutorial/LiquidCrystalCursor
 
- */
+*/
 
 // include the library code:
 #include <LiquidCrystal.h>
 
 // initialize the library with the numbers of the interface pins
-LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
+// initialize the library with the arduino pin numbers of the LCD interface pins
+const int rs=12, en=11, d4=5, d5=4, d6=3, d7=2;
+LiquidCrystal lcd(rs,en,d4,d5,d6,d7);
 
 void setup() {
   // set up the LCD's number of columns and rows:

examples/CustomCharacter/CustomCharacter.ino

@@ -26,23 +26,27 @@
  by Tom Igoe
  modified 11 Nov 2013
  by Scott Fitzgerald
+ modified 7 Nov 2016
+ by Arturo Guadalupi
 
  Based on Adafruit's example at
  https://github.com/adafruit/SPI_VFD/blob/master/examples/createChar/createChar.pde
 
  This example code is in the public domain.
- http://www.arduino.cc/en/Tutorial/LiquidCrystal
+ http://www.arduino.cc/en/Tutorial/LiquidCrystalCustomCharacter
 
  Also useful:
  http://icontexto.com/charactercreator/
 
- */
+*/
 
 // include the library code:
 #include <LiquidCrystal.h>
 
 // initialize the library with the numbers of the interface pins
-LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
+// initialize the library with the arduino pin numbers of the LCD interface pins
+const int rs=12, en=11, d4=5, d5=4, d6=3, d7=2;
+LiquidCrystal lcd(rs,en,d4,d5,d6,d7);
 
 // make some custom characters:
 byte heart[8] = {

examples/Display/Display.ino

@@ -30,18 +30,22 @@
  by Tom Igoe
  modified 22 Nov 2010
  by Tom Igoe
+ modified 7 Nov 2016
+ by Arturo Guadalupi
 
  This example code is in the public domain.
 
  http://www.arduino.cc/en/Tutorial/LiquidCrystalDisplay
 
- */
+*/
 
 // include the library code:
 #include <LiquidCrystal.h>
 
 // initialize the library with the numbers of the interface pins
-LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
+// initialize the library with the arduino pin numbers of the LCD interface pins
+const int rs=12, en=11, d4=5, d5=4, d6=3, d7=2;
+LiquidCrystal lcd(rs,en,d4,d5,d6,d7);
 
 void setup() {
   // set up the LCD's number of columns and rows:

examples/HelloWorld/HelloWorld.ino

@@ -31,17 +31,22 @@
  by Tom Igoe
  modified 22 Nov 2010
  by Tom Igoe
+ modified 7 Nov 2016
+ by Arturo Guadalupi
 
  This example code is in the public domain.
 
- http://www.arduino.cc/en/Tutorial/LiquidCrystal
- */
+ http://www.arduino.cc/en/Tutorial/LiquidCrystalHelloWorld
+
+*/
 
 // include the library code:
 #include <LiquidCrystal.h>
 
 // initialize the library with the numbers of the interface pins
-LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
+// initialize the library with the arduino pin numbers of the LCD interface pins
+const int rs=12, en=11, d4=5, d5=4, d6=3, d7=2;
+LiquidCrystal lcd(rs,en,d4,d5,d6,d7);
 
 void setup() {
   // set up the LCD's number of columns and rows:

examples/Scroll/Scroll.ino

@@ -30,18 +30,22 @@
  by Tom Igoe
  modified 22 Nov 2010
  by Tom Igoe
+ modified 7 Nov 2016
+ by Arturo Guadalupi
 
  This example code is in the public domain.
 
  http://www.arduino.cc/en/Tutorial/LiquidCrystalScroll
 
- */
+*/
 
 // include the library code:
 #include <LiquidCrystal.h>
 
 // initialize the library with the numbers of the interface pins
-LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
+// initialize the library with the arduino pin numbers of the LCD interface pins
+const int rs=12, en=11, d4=5, d5=4, d6=3, d7=2;
+LiquidCrystal lcd(rs,en,d4,d5,d6,d7);
 
 void setup() {
   // set up the LCD's number of columns and rows:

examples/SerialDisplay/SerialDisplay.ino

@@ -29,17 +29,22 @@
  by Tom Igoe
  modified 22 Nov 2010
  by Tom Igoe
+ modified 7 Nov 2016
+ by Arturo Guadalupi
 
  This example code is in the public domain.
 
- http://www.arduino.cc/en/Tutorial/LiquidCrystalSerial
- */
+ http://www.arduino.cc/en/Tutorial/LiquidCrystalSerialDisplay
+
+*/
 
 // include the library code:
 #include <LiquidCrystal.h>
 
 // initialize the library with the numbers of the interface pins
-LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
+// initialize the library with the arduino pin numbers of the LCD interface pins
+const int rs=12, en=11, d4=5, d5=4, d6=3, d7=2;
+LiquidCrystal lcd(rs,en,d4,d5,d6,d7);
 
 void setup() {
   // set up the LCD's number of columns and rows:

examples/TextDirection/TextDirection.ino

 /*
-LiquidCrystal Library - TextDirection
-
-Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
-library works with all LCD displays that are compatible with the
-Hitachi HD44780 driver. There are many of them out there, and you
-can usually tell them by the 16-pin interface.
-
-This sketch demonstrates how to use leftToRight() and rightToLeft()
-to move the cursor.
-
-The circuit:
-* LCD RS pin to digital pin 12
-* LCD Enable pin to digital pin 11
-* LCD D4 pin to digital pin 5
-* LCD D5 pin to digital pin 4
-* LCD D6 pin to digital pin 3
-* LCD D7 pin to digital pin 2
-* LCD R/W pin to ground
-* 10K resistor:
-* ends to +5V and ground
-* wiper to LCD VO pin (pin 3)
-
-Library originally added 18 Apr 2008
-by David A. Mellis
-library modified 5 Jul 2009
-by Limor Fried (http://www.ladyada.net)
-example added 9 Jul 2009
-by Tom Igoe
-modified 22 Nov 2010
-by Tom Igoe
-
-This example code is in the public domain.
-
-http://www.arduino.cc/en/Tutorial/LiquidCrystalTextDirection
+ LiquidCrystal Library - TextDirection
+
+ Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
+ library works with all LCD displays that are compatible with the
+ Hitachi HD44780 driver. There are many of them out there, and you
+ can usually tell them by the 16-pin interface.
+
+ This sketch demonstrates how to use leftToRight() and rightToLeft()
+ to move the cursor.
+
+ The circuit:
+  * LCD RS pin to digital pin 12
+  * LCD Enable pin to digital pin 11
+  * LCD D4 pin to digital pin 5
+  * LCD D5 pin to digital pin 4
+  * LCD D6 pin to digital pin 3
+  * LCD D7 pin to digital pin 2
+  * LCD R/W pin to ground
+  * 10K resistor:
+  * ends to +5V and ground
+  * wiper to LCD VO pin (pin 3)
+
+ Library originally added 18 Apr 2008
+ by David A. Mellis
+ library modified 5 Jul 2009
+ by Limor Fried (http://www.ladyada.net)
+ example added 9 Jul 2009
+ by Tom Igoe
+ modified 22 Nov 2010
+ by Tom Igoe
+ modified 7 Nov 2016
+ by Arturo Guadalupi
+
+ This example code is in the public domain.
+
+ http://www.arduino.cc/en/Tutorial/LiquidCrystalTextDirection
 
 */
 
@@ -40,7 +42,9 @@ http://www.arduino.cc/en/Tutorial/LiquidCrystalTextDirection
 #include <LiquidCrystal.h>
 
 // initialize the library with the numbers of the interface pins
-LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
+// initialize the library with the arduino pin numbers of the LCD interface pins
+const int rs=12, en=11, d4=5, d5=4, d6=3, d7=2;
+LiquidCrystal lcd(rs,en,d4,d5,d6,d7);
 
 int thisChar = 'a';
 

examples/setCursor/setCursor.ino

@@ -29,24 +29,28 @@
  by Tom Igoe
  modified 22 Nov 2010
  by Tom Igoe
+ modified 7 Nov 2016
+ by Arturo Guadalupi
 
  This example code is in the public domain.
 
  http://www.arduino.cc/en/Tutorial/LiquidCrystalSetCursor
 
- */
+*/
 
 // include the library code:
 #include <LiquidCrystal.h>
 
+// initialize the library with the numbers of the interface pins
+// initialize the library with the arduino pin numbers of the LCD interface pins
+const int rs=12, en=11, d4=5, d5=4, d6=3, d7=2;
+LiquidCrystal lcd(rs,en,d4,d5,d6,d7);
+
 // these constants won't change.  But you can change the size of
 // your LCD using them:
 const int numRows = 2;
 const int numCols = 16;
 
-// initialize the library with the numbers of the interface pins
-LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
-
 void setup() {
   // set up the LCD's number of columns and rows:
   lcd.begin(numCols, numRows);