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).
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