/*
  HC-SR04 Ultrasonic Sensor Example.

  Turn the LED on when an object is within 100cm range.

  Copyright (C) 2021, Uri Shaked
*/
#include<Servo.h>
#define ECHO_PIN 2
#define TRIG_PIN 3
Servo myservo;
int pos;

void setup() {
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  myservo.attach(7);
}

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 loop() {
  float distance = readDistanceCM();

  if(distance>385)
  {
    digitalWrite(LED_BUILTIN,HIGH);
    Serial.println("Distancs");
    Serial.println(distance);
    Serial.println("Motor is on");
    for(int pos=0;pos<=180;pos++)
    {
      myservo.write(pos);
      delay(10);
    }
     for(int pos=180;pos>=0;pos--)
    {
      myservo.write(pos);
      delay(10);
    }

  }
  delay(100);
}