Text_on_2_line_display.ino

#include <LiquidCrystal.h>

String lcdLine = "";
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

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!");
// start serial port at 9600 bps:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }
}

void loop() {
  lcdLine = "";
  
  lcdLine = Serial.readStringUntil("\n");
  if (lcdLine.length() > 0) {
    
    lcd.setCursor(0, 0);
    lcdLine.trim();
    lcd.print(lcdLine);
  }
}