#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
int relayPin = 8;
int onTime = 10000;  // waktu on dalam milisecond (10 detik = 10 * 1000 = 10000)
int offTime = 10000; // waktu off dalam milisecond (10 detik = 10 * 1000 = 10000)
int timer = 0;

void setup() {
  lcd.begin(16, 2);
  lcd.print("Pompa ");
  lcd.setCursor(0, 1);
  lcd.print("Chandika Agrolestari");
  pinMode(relayPin, OUTPUT);
}

void loop() {
  lcd.setCursor(6, 0);
  lcd.print("On ");
  digitalWrite(relayPin, HIGH);
  delay(onTime);

  lcd.setCursor(6, 0);
  lcd.print("Off");
  digitalWrite(relayPin, LOW);
  delay(offTime);
}