#include <Servo.h>
#define buttonc 11
#define buttona 2
#define buttonb 1

#define PIN_TRIG 13
#define PIN_ECHO 12


Servo myservo;

int pos = 0;
int statusx;
int statusy;
int statusz;
int leda = 4;
int ledb = 7;
int ledc = 10;
int start = 0;

void setup()
 {

  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);

   myservo.attach(9);
   pinMode(buttona, INPUT_PULLUP);

   myservo.attach(9);
  pinMode(buttonb, INPUT_PULLUP);

  pinMode(buttonc, INPUT_PULLUP);

  pinMode(leda, OUTPUT);
  pinMode(ledb, OUTPUT);
  myservo.write(0);
  
 }

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

  int duration = pulseIn(PIN_ECHO, HIGH);
  Serial.print("Distance in CM: ");
  Serial.println(duration / 58);

  duration = duration / 58;
  
  delay(10);

  statusx = digitalRead(buttona);
  if(statusx == 0)
  {
    digitalWrite(leda, 1);
     myservo.write(90);
    delay (1000);
    digitalWrite(leda, 0);
    myservo.write(0);
    delay (10);
  }

 statusy = digitalRead(buttonb);
 if(statusy == 0)
  {
    digitalWrite(ledb, 1);
    myservo.write(180);
    delay (1000);
    digitalWrite(ledb, 0);
    myservo.write(0);
    delay (10);
  }

  if( start == 0 && duration <= 100)
  {
    digitalWrite(ledc, 1);
    myservo.write(180);
    delay (1000);
    digitalWrite(ledc, 0);
    myservo.write(0);
    delay (statusz);
    start = 1;
  }

  if(duration >=100)
  {
    myservo.write(0);
    digitalWrite(ledc, 0);
  }

  statusz = digitalRead(buttonc);
  if(statusz == 0)
  {
    start = 0;
  }
}