LCD2004顯示器配合I2C嘅函式庫同Arduino代碼

/*
 *  Download library: https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library
 *  
 *  Updated by Ahmad Shamshiri on July 8, 2018 at 19:14 in Ajax, Ontario, Canada
 * for Robojax.com
 * Get this code from Robojax.com
 * Watch video instructions 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 backlight and print a message.
	lcd.backlight();
	lcd.print("Hello, world!");
}

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

/*
 * 
 * *  Download library: https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library
 * This code is basic usage of an 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 instructions 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 backlight 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();// clear 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

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

 * Get this code from Robojax.com
 * Watch video instructions 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);
	}
}

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

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 via 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