Arduino Project 023A - Liquid Crystal Displays - Autoscroll

Before wiring the LCD screen to your Arduino board we suggest to solder a pin header strip to the 14 (or 16) pin count connector of the LCD screen, as you can see in the image further up.

To start with, you will create a demonstration project that will show off most of the functions available in the LiquidCrystal.h library. To do so, you’ll use a backlit 16x2 LCD Display. 

To wire your LCD screen to your board, connect the following pins:

• LCD RS pin to digital pin 9

• LCD Enable pin to digital pin 8

• 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 GND

• LCD VSS pin to GND

• LCD VCC pin to 5V

• LCD LED+ to 5V through a 220 ohm resistor

• LCD LED- to GND

Project 23A Liquid Crystal Displays -Autoscroll 

/* Coding Ron Wang
   Oct.23rd 2024
   Autaba support for coding hardware
   Project 23A  Basic LCD Control-AutoScroll
 */
 
#include <LiquidCrystal.h>
// Initialize the library with the numbers of the interface pins
const int rs = 9, en = 8, 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:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("Hello, World!");
  delay(1000);
}
void loop() {
  // scroll 13 positions (string length) to the left
  // to move it offscreen left:
  for (int positionCounter = 0; positionCounter < 13; positionCounter++) {
    // scroll one position left:
    lcd.scrollDisplayLeft();
    // wait a bit:
    delay(150);
  }
  // scroll 29 positions (string length + display length) to the right
  // to move it offscreen right:
  for (int positionCounter = 0; positionCounter < 29; positionCounter++) {
    // scroll one position right:
    lcd.scrollDisplayRight();
    // wait a bit:
    delay(150);
  }
  // scroll 16 positions (display length + string length) to the left
  // to move it back to center:
  for (int positionCounter = 0; positionCounter < 16; positionCounter++) {
    // scroll one position left:
    lcd.scrollDisplayLeft();
    // wait a bit:
    delay(150);
  }
  // delay at the end of the full loop:
  delay(1000);
}

Additionally, wire a 10k potentiometer to +5V and GND, with it's wiper (output) to LCD screens VO pin (pin3).