/* Anschluß LCD-Display: SDA --> A4; SCL --> A5 */

#include <LiquidCrystal_I2C.h>
#include <NewPing.h>

const int trigger_Pin = 7;
const int echo_Pin = 8;
const int maxDistanz = 80;

LiquidCrystal_I2C lcd(0x27,16,2);
NewPing sonar(trigger_Pin,echo_Pin,maxDistanz);

// Umlaute darstellen
void printx(const char a[]){
  int i=0;
  while (true) {
    char ch = a[i++];
    if (ch == 0) return;
    if (ch == '&') {
      ch = a[i++];
      switch (ch) {
        case 'a': lcd.write(0xE1);
        break;
        case 'o': lcd.write(0xFE);
        break;
        case 'u': lcd.write(0xF5);
        break;
        default: if (ch<128) lcd.write(ch);
      }
    } else if (ch<128) {
      lcd.write(ch);
    }
  }
}

void setup() {
  pinMode(trigger_Pin, OUTPUT);
  digitalWrite(trigger_Pin, LOW);
  lcd.init();
  lcd.backlight();
}

void abstand() {
  int cm = sonar.ping_cm();
  lcd.clear();
  if (cm) {
    lcd.print(cm); lcd.print(" cm");
  } else {
    lcd.print("Maximale Distanz");
    lcd.setCursor(0,1);
    printx("&uberschritten!");
  }
}

void loop() {
  abstand();
  delay(1000);
}