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lib/LiquidCrystal_I2C/examples/Scroll/Scroll.ino

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+/*
+  NAME:
+  Demonstration scrolling text to the left and right without changing text.
+
+  DESCRIPTION:
+  This sketch demonstrates the use of the scrollDisplayLeft() and
+  scrollDisplayRight() functions to make new text scroll to the left and right.
+  * The sketch is intended preferrably for 16x2 LCD, but can be configured
+    for 20x4 LCDs just by uncommenting and commenting related sections.
+  * The sketch is just for demonstration purposes, so that it is not
+    optimized for memory usage.
+
+  LICENSE:
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the MIT License (MIT).
+    
+  CREDENTIALS:
+  Author: Libor Gabaj
+  Version: 1.0.0
+  Updated: 20.03.2016
+  
+  CREDIT:
+  The example taken and rewritten for I2C from official Arduino standard library
+  (https://github.com/arduino/Arduino/tree/master/libraries/LiquidCrystal)
+*/
+#include <Wire.h>
+#include <LiquidCrystal_I2C.h>
+
+// LCD address and geometry and library initialization
+const byte lcdAddr = 0x27;  // Address of I2C backpack
+const byte lcdCols = 16;    // Number of character in a row
+const byte lcdRows = 2;     // Number of lines
+//const byte lcdAddr = 0x3F;  // Address of I2C backpack
+//const byte lcdCols = 20;    // Number of character in a row
+//const byte lcdRows = 4;     // Number of lines
+
+LiquidCrystal_I2C lcd(lcdAddr, lcdCols, lcdRows);
+
+// Demo parameters
+const char demoText[]= "Hello World!";
+const unsigned int scrollDelay = 500;   // Miliseconds before scrolling next char
+const unsigned int demoDelay = 2000;    // Miliseconds between demo loops
+byte textLen;                           // Number of visible characters in the text
+
+void setup() {
+  textLen = sizeof(demoText) - 1;
+  lcd.init();
+  lcd.backlight();
+  lcd.print(demoText);
+  delay(demoDelay);
+}
+
+void loop() {
+  // Scroll entire text in a row to the left outside the screen
+  for (byte positionCounter = 0; positionCounter < textLen; positionCounter++) {
+    lcd.scrollDisplayLeft();
+    delay(scrollDelay);
+  }
+  // Scroll hidden text through entire row to the right outside the screen
+  for (byte positionCounter = 0; positionCounter < textLen + lcdCols; positionCounter++) {
+    lcd.scrollDisplayRight();
+    delay(scrollDelay);
+  }
+  // Scroll text to the right back to original position
+  for (byte positionCounter = 0; positionCounter < lcdCols; positionCounter++) {
+    lcd.scrollDisplayLeft();
+    delay(scrollDelay);
+  }
+  delay(demoDelay);
+}
+