#include <Servo.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo siservo;
#define ECHO_PIN 6
#define TRIG_PIN 5
int sudut = 0;
void setup() {
  // put your setup code here, to run once:
  lcd.init();
  lcd.backlight();
  pinMode(4, OUTPUT);
  pinMode(7, OUTPUT);
  siservo.attach(3);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}
float jarak_cm()
{
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}
void loop() {
  // put your main code here, to run repeatedly:
  float cm = jarak_cm();

  if ( cm <= 100 )
  {sudut = 0;
  siservo.write(sudut);
  digitalWrite(4, HIGH);
  tone(7, 500);
  delay(1000);
  {sudut = 180;
  siservo.write(sudut);
  digitalWrite(4, LOW);
  noTone(7);
  lcd.setCursor(0,0);
  lcd.print("AWAS BANJIR!");
  delay(1000);
  }}
  
  else
  if(cm <= 200)
  {sudut = 0;
  siservo.write(sudut);
  lcd.setCursor(0,0);
  lcd.print("SAMPAH PENUH");
  delay(1000);
  }

  else
  {sudut = 180;
  siservo.write(sudut);
  lcd.setCursor(0,0);
  lcd.print("SAMPAH AMAN!");
  delay(1000);
  }
  
}