#define ECHO_PIN 3
#define TRIG_PIN 2
#define pinBuzzer 5
#define LedM 4
#define LedK 7
#define LedH 8
#include  <Servo.h>
Servo myservo;

int potpin = 0;
int val;

float readDistanceCM() {
  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 setup() {
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  Serial.begin(115200);
  pinMode(pinBuzzer,OUTPUT);
  pinMode(LedM, OUTPUT );
  pinMode(LedK, OUTPUT);
  pinMode(LedH, OUTPUT);
  myservo.attach(9);

}

void loop() {
  float distance = readDistanceCM();
  Serial.print("Measured distance: ");
  Serial.println(readDistanceCM());
  Serial.println(" CM");
  Serial.println("Warning: ");

  if(distance <=200){
    myservo.write(90);
    delay(15);
    tone(pinBuzzer, 1000);
    digitalWrite(LedM, HIGH);
    digitalWrite(LedK, LOW);
    digitalWrite(LedH, LOW);
    delay(200);
    tone(pinBuzzer, 500);
    delay(200);
    Serial.println("STOP");
  }
  else if(distance <=300){
    noTone(pinBuzzer);
    digitalWrite(LedK,HIGH );
    delay(100);
    digitalWrite(LedK, LOW);
    delay(150);
    digitalWrite(LedM, LOW);
    digitalWrite(LedH, LOW);
    Serial.println("HATI-HATI");

  }
  else{
    myservo.write(0);
    noTone(pinBuzzer);
    digitalWrite(LedM, LOW);
    digitalWrite(LedK, LOW);
    digitalWrite(LedH, HIGH);
    Serial.println("SEMOGA SELAMAT SAMPAI TUJUAN");

  }

}