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libraries/hd44780/examples/ioClass/hd44780_I2Clcd/HelloWorld/HelloWorld.ino

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+// vi:ts=4
+// ----------------------------------------------------------------------------
+// HelloWorld - simple demonstration of lcd
+// Created by Bill Perry 2016-07-02
+// bperrybap@opensource.billsworld.billandterrie.com
+//
+// This example code is unlicensed and is released into the public domain
+// ----------------------------------------------------------------------------
+//
+// This sketch is for LCD modules that have a native I2C interface such as
+// PCF2119x, PCF2116, or certain RayStar LCDs rather than those LCD modules that
+// use an i/o expander chip based based backpack.
+// NOTE:
+//	These devices usually need external pullups as they typically are not on
+//	the module.
+// WARNING:
+//	Use caution when using 3v only processors like arm and ESP8266 processors
+//	when interfacing with 5v modules as not doing proper level shifting or
+//	incorrectly hooking things up can damage the processor.
+// 
+// Sketch prints "Hello, World!" on the lcd
+//
+// If initialization of the LCD fails and the arduino supports a built in LED,
+// the sketch will simply blink the built in LED.
+//
+// ----------------------------------------------------------------------------
+// LiquidCrystal compability:
+// Since hd44780 is LiquidCrystal API compatible, most existing LiquidCrystal
+// sketches should work with hd44780 hd44780_I2Clcd i/o class once the
+// includes are changed to use hd44780 and the lcd object constructor is
+// changed to use the hd44780_I2Clcd i/o class.
+
+#include <Wire.h>
+#include <hd44780.h>
+#include <hd44780ioClass/hd44780_I2Clcd.h> // i2c LCD i/o class header
+
+// Note, i2c address can be specified or automatically located
+// If you wish to use a specific address comment out this constructor
+// and use the constructor below that specifies the address
+
+// declare the lcd object for auto i2c address location
+hd44780_I2Clcd lcd;
+
+//
+// enter address of LCD.
+// Addresses seen so far include:
+// - 0x3a, 0x3b (PCF2119x)
+// - 0x3c (unknwon chip)
+// - 0x3d (unknwon chip)
+// - 0x3e (unknwon chip)
+// - 0x3f (unknwon chip)
+
+// declare i2c address and constructor for specified i2c address
+//const int i2c_addr = 0x3e;
+//hd44780_I2Clcd lcd(i2c_addr); // use device at this address
+
+
+// LCD geometry
+const int LCD_COLS = 16;
+const int LCD_ROWS = 2;
+void setup()
+{
+int status;
+
+	// initialize LCD with number of columns and rows: 
+	// hd44780 returns a status from begin() that can be used
+	// to determine if initalization failed.
+	// the actual status codes are defined in <hd44780.h>
+	// See the values RV_XXXX
+	//
+	// looking at the return status from begin() is optional
+	// it is being done here to provide feedback should there be an issue
+	//
+	status = lcd.begin(LCD_COLS, LCD_ROWS);
+	if(status) // non zero status means it was unsuccesful
+	{
+		// begin() failed so blink error code using the onboard LED if possible
+		hd44780::fatalError(status); // does not return
+	}
+
+	// Print a message to the LCD
+	lcd.print("Hello, World!");
+}
+
+void loop() {}