Library and Arduino code for LCD2004 display with I2C

Arduino code for LCD2004 with I2C module

In this page we have got two Arduino sketch. There are various code to display data on LCD2004-I2C.
You need to download the Liquid Crystal library.

Run I2C scanner to get the address from this page

Arduino Code for LCD2004 with I2C Hello World sketch

This code prints simple Hello World text on screen


  
/*
 *  Download library: https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library
 *  
 *  Updated by Ahmad Shamshiri on July 08, 2018 at 19:14 in Ajax, Ontario, Canada
 * for Robojax.com
 * Get this code from Robojax.com
 * Watch video instruction for this code at:https://youtu.be/DKmNSCMPDjE
 * 
 */
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

// Set the LCD address to 0x27 for a 20 chars and 4 line display
LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup()
{
	// initialize the LCD
	lcd.begin();

	// Turn on the blacklight and print a message.
	lcd.backlight();
	lcd.print("Hello, world!");
}

void loop()
{
	// Do nothing here...
}

Arduino Code for LCD2004 with I2C Robojax Custom sketch

This code prints values from variable or sensors with texts on the same line or in multiple lines.


 /*
 * 
 * *  Download library: https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library
 * This code is basic usage of LCD2004 display with I2C 
 * It will display text in 4 lines each with 20 characters
 * It Displays multiple float values and text on the same line 
 * 
 * 
 * 
 * Updated by Ahmad Shamshiri on July 08, 2018 at 09:20 in Ajax, Ontario, Canada
 * for Robojax.com
 * Get this code from Robojax.com
 * Watch video instruction for this code at:https://youtu.be/DKmNSCMPDjE
 * 

 */

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
// Set the LCD address to 0x27 for a 20 chars and 4 line display
LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {

  // initialize the LCD, 
  lcd.begin();
  // Turn on the blacklight and print a message.
  lcd.backlight();
  lcd.clear();
   lcd.setCursor (0,0); //
   lcd.print("Robojax LCD2004 Test"); 
   lcd.setCursor (0,1); //   
 
   lcd.print("Please Wait - 3");  
   lcd.setCursor (0,1); // 
   delay(1000);        
   lcd.print("Please Wait - 2");  
   delay(1000); 
   lcd.setCursor (0,1); //      
   lcd.print("Please Wait - 1");  
   delay(1000);       
}

void loop() {

    // Robojax.com LCD2004 with I2C custom code
  lcd.clear();// clearn previous values from screen
  lcd.setCursor (0,0); //character zero, line 1
  lcd.print("LCD2004 I2C Example"); // print text  

  lcd.setCursor (4,1); //character 4, line 2
  lcd.print("Robojax.com"); // print text   

  lcd.setCursor (0,2); //character 0, line 3
  lcd.print("Voltage: "); // print text 
  float v = 8.254;// define or get voltage
  char VoltageStr[5];
  dtostrf(v, 5, 3, VoltageStr );
  lcd.setCursor (9,2); //character 9, line 3  
  lcd.print(VoltageStr); // print voltage
  lcd.setCursor (14,2); //character 14, line 3
  lcd.print("V"); // print V at the end of voltage  

  lcd.setCursor (0,3); //character 0, line 4
  lcd.print("X: "); // print x
  float xdeg = -123.87;// define or get x degree (just example)
  lcd.setCursor (3,3); //character 8, line 3  
  lcd.print(xdeg); // print xdeg value

  
  lcd.setCursor (12,3); //character 12, line 4
  lcd.print("Y: "); // print Y
  float ydeg = 32.8;// define or get y degree (just example)
  lcd.setCursor (15,3); //character 15, line 4  
  lcd.print(ydeg); // print ydeg value
      
                     
   delay(100);

}// loop end

Arduino Code for LCD2004 with I2C Blinking sketch

This code will display blinking cursor on the screen.


 
 /*
 * 
 *  Download library: https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library
 * This code is basic usage of LCD2004 display with I2C 
 * It will display blinking cursor on screen 
 * 

 * Get this code from Robojax.com
 * Watch video instruction for this code at:https://youtu.be/DKmNSCMPDjE
 * 

 */
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

// Set the LCD address to 0x27 for a 20 chars and 4 line display
LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup()
{
	// initialize the LCD
	lcd.begin();
}

void loop()
{
	bool blinking = true;
	lcd.cursor();

	while (1) {
		if (blinking) {
			lcd.clear();
			lcd.print("No cursor blink");
			lcd.noBlink();
			blinking = false;
		} else {
			lcd.clear();
      lcd.setCursor(0,1);
      lcd.print("Your name: ");
      lcd.blink();
			blinking = true;
		}
		delay(4000);
	}
}

Arduino Code for LCD2004 with I2C Serial monitor sketch

This code prints characters you type on the serial monitor.


  /*
 * 
 *  Download library: https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library
 * This code is basic usage of LCD2004 display with I2C 
 * It code will allow you to enter character on the serial monitor and display it on this screen
 * 

 * Updated by Ahmad Shamshiri on July 08, 2018 at 09:20 in Ajax, Ontario, Canada
 * for Robojax.com
 * Get this code from Robojax.com
 * Watch video instruction for this code at:https://youtu.be/DKmNSCMPDjE
 * 
 */
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

// Set the LCD address to 0x27 for a 20 chars and 4 line display
LiquidCrystal_I2C lcd(0x27, 20, 04);

char lastChar ='_';
void setup()
{
	lcd.begin();
	lcd.backlight();
  lcd.print("Robojax.com Test");
	// Initialize the serial port at a speed of 9600 baud
	Serial.begin(9600);
}

void loop()
{

      lcd.clear();
      lcd.setCursor(0,1);
      lcd.print("Enter Letter: ");

      lcd.setCursor(13,1);  
	// If characters arrived over the serial port...
	if (Serial.available()) {
		// Wait a bit for the entire message to arrive
		delay(100);


		// Write all characters received with the serial port to the LCD.
		while (Serial.available() > 0) {
      lastChar =Serial.read();
      Serial.print("Entered: ");
      Serial.println(lastChar);
		}//while end
	}// if end

  lcd.write(lastChar);// display last entered character
  delay(1000);


}// loop end