LCDSerialHandler.ino

#include <LiquidCrystal.h>
LiquidCrystal lcd(10, 11, 2, 3, 4, 5);

String inputString = "";
boolean stringComplete = false;

void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2);
  inputString.reserve(128); //allocate 128 bytes RAM geheugen voor de string
}

void loop() {
  handleStringComplete();
}

void handleStringComplete() {
  if (stringComplete) {
    if(inputString.startsWith("L1:")) {
      lcdLineTop(inputString.substring(3));
    } else if(inputString.startsWith("L2:")) {
      lcdLineBot(inputString.substring(3));
    }

    stringComplete = false;
    inputString = "";
  }
}

void serialEvent() {
  while (Serial.available()) {
    char inChar = (char)Serial.read();
    if (inChar == '\n') {
      stringComplete = true;
    } else {
      inputString += inChar;      
    }
  }
}

void lcdLineTop(String string) {
  //doe hierzo de bovenste line van de lcd handlen
  Serial.println("LCD Top lijn: " + string);
  lcd.setCursor(0, 0);
  lcd.print(string);
}

void lcdLineBot(String string) {
  //doe hierzo de bovenste line van de lcd handlen
  Serial.println("LCD Bottom lijn: " + string);
  lcd.setCursor(0, 1);
  lcd.print(string);
}