#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 potpi = 0;
int val;

float readDistancCM() {
  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() {
  // put your setup code here, to run once:
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() {
  // put your main code here, to run repeatedly:
float distance = readDistancCM();
Serial.print("Measured distance:");
Serial.println(readDistancCM());
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");
  myservo.write(0);
}
else{
  myservo.write(0);
  noTone(pinBuzzer);
  digitalWrite(ledM,LOW);
  digitalWrite(ledK,LOW);
  digitalWrite(ledH,HIGH);
  Serial.println("SEMOGA SELAMAT SAMPAI TUJUAN");
}
}