20X4 LCD DISPLAY CODE REQUEST

Other Hardware Displays
1

HI ANYONE,

CAN HELP TO PROVIDE THE 20x4 LCD DISPLAY CODE PLEASE. THANKS

2

Please don't use capital letters, it's considered shouting.

In your code, in your other post, change:

  lcd.begin(16, 2);

to:

  lcd.begin(20, 4);
3

You will need to install the LiquidCrystal_I2C.

This is the sketch we use to test our LCDs. You can use it to give you an idea how to work with it.

/*
 This sketch will display a series of numbers 0-44 on a LCD screen 20x4 filling each line with consecutive numbers until it reaches
 the end and then it starts again. 
 
 Code used for learning purposes developed by: www.HackerspaceLA.org | @hackerspacela 
 Code modified from Adafruit at: https://www.arduino.cc/en/Tutorial/LiquidCrystalAutoscroll
 This example code is in the public domain: http://www.arduino.cc/en/Tutorial/LiquidCrystalAutoscroll
 */
 // include the library code:
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

//#define pins:

#define I2C_ADDR    0x27 // LCD address (make sure you run the I2C scanner to verify our LCD address)
#define Rs_pin  0        // Assign pins between I2C and LCD
#define Rw_pin  1
#define En_pin  2
#define BACKLIGHT_PIN 3
#define D4_pin  4
#define D5_pin  5
#define D6_pin  6
#define D7_pin  7

LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);


// initialize the library with the numbers of the interface pins

void setup() {
  // set up backlight and turn on module:
lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
lcd.setBacklight(HIGH);
  // set up the LCD's number of columns and rows:
lcd.begin(20, 4); //My LCD is 20x4

}

void loop() {
  // set the cursor to (0, 0) on line #1
  lcd.setCursor (0, 0);
  //lcd.autoscroll();
  // print from 0 to 14:
  for (int thisChar = 0; thisChar < 15; thisChar++) {
    lcd.print(thisChar);
    lcd.leftToRight();
    delay(500);
  }

  // set the cursor to (0, 1) on line #2
  lcd.setCursor (0, 1);
  // set the display to automatically scroll:
  //lcd.autoscroll();
  // print from 0 to 14:
  for (int thisChar = 15; thisChar < 25; thisChar++) {
    lcd.print(thisChar);
    delay(500);
  }

    // set the cursor to (0, 1) on line #3
  lcd.setCursor (0, 2);
  // set the display to automatically scroll:
  //lcd.autoscroll();
  // print from 0 to 14:
  for (int thisChar = 25; thisChar < 35; thisChar++) {
    lcd.print(thisChar);
    delay(500);
  }

    // set the cursor to (0, 1) on line #4
  lcd.setCursor (0, 3);
  // set the display to automatically scroll:
  //lcd.autoscroll();
  // print from 0 to 14:
  for (int thisChar = 35; thisChar < 45; thisChar++) {
    lcd.print(thisChar);
    delay(500);
  }
    
  // turn off automatic scrolling
  lcd.noAutoscroll();

  // clear screen for the next loop:
  lcd.clear();
}

See example in action here: https://goo.gl/photos/yqhsG5i93vbi22qa7

4

You will need to install the LiquidCrystal_I2C.

Are you sure about that?

Don

5

Maybe this will help

6

Why are you SHOUTING at us?

Please fix your keyboard.

// Per.

7

Lots of information and example code HERE:

http://arduino-info.wikispaces.com/LCD-Blue-I2C

Make sure you have identified the right 'backback" I2C module....

8

terryking228:
Lots of information and example code HERE:

http://arduino-info.wikispaces.com/LCD-Blue-I2C

Make sure you have identified the right 'backback" I2C module....

I frequently point people to your tutorial but it won't do any good in this case. He's not using any backpack I2C module.

Don

9

Arduino: 1.8.5 (Windows 7), Board: "Arduino/Genuino Uno"

Build options changed, rebuilding all
C:\Users\Surajika\Documents\Arduino\LCD2004\LCD2004.ino:12:31: fatal error: LiquidCrystal_I2C.h: No such file or directory

#include <LiquidCrystal_I2C.h>

^

compilation terminated.

exit status 1
Error compiling for board Arduino/Genuino Uno.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.