#include <LiquidCrystal_I2C.h>
#include <Servo.h>

LiquidCrystal_I2C lcd (0x27, 16, 2);
Servo pompa;

#define pinTrig 1
#define pinEcho 2

float jarak;
long echoTime;
float tinggiAir;
bool pumpOn=false;

void setup(){
  pompa.attach(3);
  pompa.write(90);
  pinMode(pinTrig, OUTPUT);
  pinMode(pinEcho, INPUT);
  digitalWrite(pinTrig, LOW);
  lcd.init();
  lcd.backlight();
}

void loop(){
  digitalWrite(pinTrig, HIGH);
  delayMicroseconds(10);
  digitalWrite(pinTrig, LOW);

  echoTime=pulseIn(pinEcho, HIGH);
  jarak=0.0001 * ((float)echoTime*340)/2;
  tinggiAir=200-jarak;

  lcd.setCursor(0,0);
  lcd.print("T.Air :");
  lcd.print(tinggiAir);
  lcd.print(" cm");

  if(tinggiAir>=150){
    pumpOn=false;
  }
  if(tinggiAir<=30){
    pumpOn=true;
  }
  if(pumpOn){
    pompa.write(90);
  }else{
    pompa.write(0);
  }
  delay (500);
}