#include <Servo.h>
Servo servo1;
const int buttonPin1 = 4;
const int buttonPin2 = 5;
const int buttonPin3 = 6;
const int buttonPin4 = 7;

const int LedPin1 = 23;
const int LedPin2 = 25;
const int LedPin3 = 27;
const int LedPin4 = 29;

int  buttonState1 = 0;
int  buttonState2 = 0;
int  buttonState3 = 0;
int  buttonState4 = 0;

int ledPin1 = 0;
int ledPin2 = 0;
int ledPin3 = 0;
int ledPin4 = 0;

int n = 1;

#define ECHO_PIN 8
#define TRIG_PIN 9

int potpin = 0; 
int val; 

void setup() {
   pinMode(buttonPin1, INPUT);
   pinMode(buttonPin2, INPUT);
   pinMode(buttonPin3, INPUT);
   pinMode(buttonPin4, INPUT);
   pinMode(LedPin1, OUTPUT);
   pinMode(LedPin2, OUTPUT);
   pinMode(LedPin3, OUTPUT);
   pinMode(LedPin4, OUTPUT);
  servo1.attach(2);
  Serial.begin(115200);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

}
  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() {
  buttonState1 = digitalRead(buttonPin1);
  buttonState2 = digitalRead(buttonPin2);
  buttonState3 = digitalRead(buttonPin3);
  buttonState4 = digitalRead(buttonPin4);
  ledPin1 = digitalRead(LedPin1);
  ledPin2 = digitalRead(LedPin2);
  ledPin3 = digitalRead(LedPin3);
  ledPin4 = digitalRead(LedPin4);
  val = analogRead(potpin);
  val = map(val, 0, 1023, 1, 4);
  float distance = readDistanceCM();
  if (n == 1){
    digitalWrite(LedPin1, HIGH);
  }
  if (distance > 40){
    servo1.write(0);
  }
if (distance > 40){
    if (buttonState1 == HIGH && ledPin1 == HIGH) {
    n = 0;
    servo1.write(180);
    delay(3000);
  } 
    if (buttonState2 == HIGH && ledPin1 == HIGH) {
    digitalWrite(LedPin1, HIGH);
    delay(1000*val);
    digitalWrite(LedPin1, LOW);
    digitalWrite(LedPin2, HIGH);
    n = 0;
    servo1.write(180);
    delay(3000);
  } 
    if (buttonState3 == HIGH && ledPin1 == HIGH) {
    digitalWrite(LedPin1, HIGH);
    delay(1000*val);
    digitalWrite(LedPin1, LOW);
    digitalWrite(LedPin2, HIGH);
    delay(1000*val);
    digitalWrite(LedPin2, LOW);
    digitalWrite(LedPin3, HIGH);
    n = 0;
    servo1.write(180);
    delay(3000);
  } 
  if (buttonState4 == HIGH && ledPin1 == HIGH) {
    digitalWrite(LedPin1, HIGH);
    delay(1000*val);
    digitalWrite(LedPin1, LOW);
    digitalWrite(LedPin2, HIGH);
    delay(1000*val);
    digitalWrite(LedPin2, LOW);
    digitalWrite(LedPin3, HIGH);
    delay(1000*val);
    digitalWrite(LedPin3, LOW);
    digitalWrite(LedPin4, HIGH);
    n = 0;
    servo1.write(180);
    delay(3000);
  } 
    if (buttonState1 == HIGH && ledPin2 == HIGH) {
    delay(1000*val);
    digitalWrite(LedPin2, LOW);
    digitalWrite(LedPin1, HIGH);
    servo1.write(180);
    delay(3000);
  } 
    if (buttonState2 == HIGH && ledPin2 == HIGH) {
    servo1.write(180);
    delay(3000);
  } 
    if (buttonState3 == HIGH && ledPin2 == HIGH) {
    delay(1000*val);
    digitalWrite(LedPin2, LOW);
    digitalWrite(LedPin3, HIGH);
    servo1.write(180);
    delay(3000);
  } 
    if (buttonState4 == HIGH && ledPin2 == HIGH) {
    delay(1000*val);
    digitalWrite(LedPin2, LOW);
    digitalWrite(LedPin3, HIGH);
    delay(1000*val);
    digitalWrite(LedPin3, LOW);
    digitalWrite(LedPin4, HIGH);
    servo1.write(180);
    delay(3000);
  } 
    if (buttonState1 == HIGH && ledPin3 == HIGH) {
    delay(1000*val);
    digitalWrite(LedPin3, LOW);
    digitalWrite(LedPin2, HIGH);
    delay(1000*val);
    digitalWrite(LedPin2, LOW);
    digitalWrite(LedPin1, HIGH);
    servo1.write(180);
    delay(3000);
  } 
    if (buttonState3 == HIGH && ledPin3 == HIGH) {
    servo1.write(180);
    delay(3000);
  } 
    if (buttonState2 == HIGH && ledPin3 == HIGH) {
    delay(1000*val);
    digitalWrite(LedPin3, LOW);
    digitalWrite(LedPin2, HIGH);
    servo1.write(180);
    delay(3000);
  } 
    if (buttonState4 == HIGH && ledPin3 == HIGH) {
    delay(1000);
    digitalWrite(LedPin3, LOW);
    digitalWrite(LedPin4, HIGH);
    servo1.write(180);
    delay(3000);
  } 
    if (buttonState1 == HIGH && ledPin4 == HIGH) {
    delay(1000);
    digitalWrite(LedPin4, LOW);
    digitalWrite(LedPin3, HIGH);
    delay(1000*val);
    digitalWrite(LedPin3, LOW);
    digitalWrite(LedPin2, HIGH);
    delay(1000*val);
    digitalWrite(LedPin2, LOW);
    digitalWrite(LedPin1, HIGH);
    servo1.write(180);
    delay(3000);
  } 
    if (buttonState4 == HIGH && ledPin4 == HIGH) {
    servo1.write(180);
    delay(3000);
  } 
    if (buttonState2 == HIGH && ledPin4 == HIGH) {
    delay(1000*val);
    digitalWrite(LedPin4, LOW);
    digitalWrite(LedPin3, HIGH);
    delay(1000*val);
    digitalWrite(LedPin3, LOW);
    digitalWrite(LedPin2, HIGH);
    servo1.write(180);
    delay(3000);
  } 
    if (buttonState3 == HIGH && ledPin4 == HIGH) {
    delay(1000*val);
    digitalWrite(LedPin4, LOW);
    digitalWrite(LedPin3, HIGH);
    servo1.write(180);
    delay(3000);
  } 
}
  
  


}