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Utility
Liquid Crystal Display (LiquidCrystal Class)
This library allows an Arduino board to control Liquid Crystal Displays (LCDs) based on the Hitachi HD44780 (or a compatible) chip set, which is found on most text-based LCDs. The library works with either 4- or 8-bit mode (i.e. using 4 or 8 data lines in addition to the rs, enable, and, optionally, the rw control lines).
To use this library, specify #include <liquidcrystal.h>.
Constructor for LiquidCrystal
- Description
- Generates a LiquidCrystal object.
- Syntax
- LiquidCrystal(rs, enable, d4, d5, d6, d7)
LiquidCrystal(rs, rw, enable, d4, d5, d6, d7)
LiquidCrystal(rs, enable, d0, d1, d2, d3, d4, d5, d6, d7)
LiquidCrystal(rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7) - Parameters
- rs: The number of the pin that is connected to the RS pin on the LCD
rw: The number of the pin that is connected to the RW pin on the LCD
enable: The number of the pin that is connected to the enable pin on the LCD
d0 to d7: The numbers of the pins that are connected to the corresponding data pins on the LCD.
begin
- Description
- Specifies the dimensions (width and height) of the display.
- Syntax
- lcd.begin(int cols, int rows)
- Parameters
- cols: Number of columns
rows: Number of rows - Returns
- None
clear
- Description
- Clears the LCD screen.
- Syntax
- lcd.clear
- Parameters
- None
- Returns
- None
home
- Description
- Returns the LCD cursor in the home position.
- Syntax
- lcd.home
- Parameters
- None
- Returns
- None
setCursor
- Description
- Moves the LCD cursor.
- Syntax
- lcd.setCursor(unsigned char col, unsigned char row)
- Parameters
- col: The column at which to position the cursor (with 0 being the left edge)
row: The row at which to position the cursor (with 0 being the first row) - Returns
- None
write
- Description
- Write a character to the LCD.
- Syntax
- lcd.write(unsigned char data)
- Parameters
- data: The character code to write to the display
- Returns
- None
- Description
- Prints character strings or number sequences to the LCD.
- Syntax
- lcd.print(val)
- Parameters
- val: Character string or value
- Returns
- None
cursor
- Description
- Displays the cursor.
- Syntax
- lcd.cursor()
- Parameters
- None
- Returns
- None
noCursor
- Description
- Hides the LCD cursor.
- Syntax
- lcd.noCursor()
- Parameters
- None
- Returns
- None
blink
- Description
- Displays the blinking LCD cursor.
- Syntax
- lcd.blink()
- Parameters
- None
- Returns
- None
noBlink
- Description
- Turns off the blinking LCD cursor.
- Syntax
- lcd.noBlink()
- Parameters
- None
- Returns
- None
display
- Description
- Turns on the LCD display, after it has been turned off with noDisplay().
- Syntax
- lcd.display()
- Parameters
- None
- Returns
- None
noDisplay
- Description
- Turns off the LCD display.
- Syntax
- lcd.noDisplay()
- Parameters
- None
- Returns
- None
scrollDisplayLeft
- Description
- Scrolls the contents of the display (text and cursor) one space to the left.
- Syntax
- lcd.scrollDisplayLeft()
- Parameters
- None
- Returns
- None
scrollDisplayRight
- Description
- Scrolls the contents of the display (text and cursor) one space to the right.
- Syntax
- lcd.scrollDisplayRight()
- Parameters
- None
- Returns
- None
autoscroll
- Description
- Turns on automatic scrolling of the LCD.
- Syntax
- lcd.autoscroll()
- Parameters
- None
- Returns
- None
noAutoscroll
- Description
- Turns off automatic scrolling of the LCD.
- Syntax
- lcd.noAutoscroll()
- Parameters
- None
- Returns
- None
leftToRight
- Description
- Sets the direction for text written to the LCD to left-to-right, the default.
- Syntax
- lcd.leftToRight()
- Parameters
- None
- Returns
- None
rightToLeft
- Description
- Set the direction for text written to the LCD to right-to-left.
- Syntax
- lcd.rightToLeft()
- Parameters
- None
- Returns
- None
Sample Program
This sample shows the Liquid Crystal Display on GR-KAEDE using three control lines and four data lines.
#include <Arduino.h>
#include <liquidcrystal.h>
LiquidCrystal lcd(12, 11, 10, 5, 4, 3, 2);
void setup()
{
lcd.begin(16,2); //16x2 lcd initial
lcd.print("KAEDE");
}
void loop() {}