serial_lcd.ino

/**
 * Displays text sent over the serial port (e.g. from the Serial Monitor) on
 * an attached LCD.
 */
//This program is originally an example program for LiquidCrystal_I2C.h
//This program is modified by Dr. Aung Win Htut
//This program read from serial and print on lcd
//we modified it to move next line if char reach col 16

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F, 16, 2); //I2C address is 0x3F but sometime it will be 0x27
//location controlled variables
int row=0;
int col=0;

int count =0; //character counter

//Setup lcd and serial here
void setup()
{
	lcd.begin();
	lcd.backlight();
	Serial.begin(9600);
}

void loop()
{
  //if data exists
	if (Serial.available()) {   
		delay(100);
		lcd.clear();
		while (Serial.available() > 0) {
      char ch = Serial.read();
      //check if data is not new line character
      //check if the col exceeds 16 then move to next row and start from first col
      //if not move column and print that char in lcd
      //if we found \n or \r then the line is over
      //we must move our cursor to 0,0 location
      if(ch!='\n'&&ch!='\r')
			{
       if(col>=16)
        {
          col=0;
          row++;
        }        
        lcd.setCursor(col,row);
			  lcd.write(ch);
        col++;       
			}
     else{ //we found new line then prepare for new input
      col=0;
      row=0;
     }
		}
	}
}