This function scrolls the contents of the display (text and cursor) a one position to the left or to the right. Lcd.scrollDisplayLeft() / lcd.scrollDisplayRight() Therefore it is possible to turn the display on and off with this function. This function turn on and off any text or cursor on the display but does not delete the information from the memory. The blink and noBlink function shows or hides a block style cursor that blinks on and off. This function displays also different data types: char, byte, int, long, or string like the function lcd.print() but lcd.println() prints always a newline to output stream.ĭisplays or hide the LCD cursor as an underscore (line) at the position to which the next character will be written. Numbers can also be printed in different number systems lcd.print(data, BASE) with BIN for binary (base 2), DEC for decimal (base 10), OCT for octal (base 8), HEX for hexadecimal (base 16). Numbers can be printed without the quotation marks. A string has to be in between quotation marks („“). This function displays different data types: char, byte, int, long, or string. Use the function write to display the values, for example a sensor value. Although you have to define the row the character should be displayed. If you want to write text to your LCD display, you have to define the starting position of the character you want to print onto the LCD with function lcd.setCursor(col, row). This function places the cursor at the upper left corner of the screen. You can place this function in the setup function of your sketch to make sure that nothing is displayed on the display when you start your program. The clear function clears any data on the LCD screen and positions the cursor in the upper-left corner. The example below defines the display as 20x4 display and display a text. For the 16x2 display you write lcd.begin(16,2) and for the 20x4 lcd.begin(20,4).
The function has to be called in the void setup() part of your sketch. The lcd.begin(cols, rows) function has to be called to define the kind of LCD display with the number of columns and rows. If you are using an LCD display with the I2C connection you do not define the connected pins because you do not connected to single pins but you define the HEX address and the display size: LiquidCrystal_I2C lcd(0x27, 20, 4) If you want to operate in the 4-bit mode the function changes: LiquidCrystal(RS, R/W, Enable, d4, d5, d6, d7) If R/W is connected to GND you do not use the parameter in the function: LiquidCrystal(RS, Enable, d0, d1, d2, d3, d4, d5, d6, d7) The order of the parameters is the following: LiquidCrystal(RS, R/W, Enable, d0, d1, d2, d3, d4, d5, d6, d7) You can use any of the Arduino digital pins to control the display. The parameters of the function define the connection between the LCD display and the Arduino. This function creates a variable of the type LiquidCrystal. These LCD’s can also operate on 4-bit mode in such case Data pin 4,5,6 and 7 will be left free. The Data Pins are connection to the Digital I/O pins of the microcontroller to send 8-bit data. So if we want to send data via the data pins 0 to 7, we have to make sure that the enable pin is high.ĭata pins 0 to 7 forms an 8-bit data line. Normally grounded to write data to LCDĬonnected to microcontroller pin and toggled between 1 and 0 for data acknowledgement. Select command register to low when we are sending commands to the LCD like set the cursor to a specific location, clear the display or turn off the display.Īnd select data register when RS is set to high to send data or characters to the LCD.ĭiffer between read or write data. We will connect the VEE pin to the potentiometer output to adjust the contrast by changing the resistance of the potentiometer. Also for a test 3V does the job.Īdjusts the contrast of the display If this pin is grounded, you get the maximum contrast. Ground pin to connected to the GND pin of the Arduino.