Prototype of homemade Internet of things

int fo = A0;
int pot = A1;
int relay = 2;
int led = 3;
int zuj = 4;
int trigPin = 5;
int echoPin = 6;
int octfo;
int ocpot;
int led1 = 7;
int led2 = 8;
int led3 = 9;
int led4 = 10;
int led5 = 11;
int led6 = 12;
int led7 = 13;

void setup() {
  Serial.begin(9600);
  pinMode(led, OUTPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led5, OUTPUT);
  pinMode(led6, OUTPUT);
  pinMode(led7, OUTPUT);
  pinMode(relay, OUTPUT);

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  digitalWrite(led, LOW);
  digitalWrite(led1, LOW);
  digitalWrite(led2, LOW);
  digitalWrite(led3, LOW);
  digitalWrite(led4, LOW);
  digitalWrite(led5, LOW);
  digitalWrite(led6, LOW);
  digitalWrite(led7, LOW);
  digitalWrite(relay, LOW);


}

void loop() {
  octfo = analogRead(fo);
  ocpot = analogRead(pot);

  Serial.println(ocpot);
  Serial.println(octfo);

  long duration, distance;       //this part is for ultrasonic senzor
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(1000);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration / 2) / 29.1;
  Serial.print(distance);
  Serial.println("CM");
  delay(10);

  if ((distance <= 10))
  {
    tone(zuj, 1000);
    digitalWrite(relay, HIGH);
  }
  else if (distance > 10)
  {
    noTone(zuj);
    digitalWrite(relay, LOW);
  }
  if (ocpot <= 76) {          // this is for potenciometar and led diodes
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
    digitalWrite(led4, LOW);
    digitalWrite(led5, LOW);
    digitalWrite(led6, LOW);
    digitalWrite(led7, LOW);

  } else if (ocpot>76 && ocpot <=147){
    digitalWrite(led1, HIGH);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
    digitalWrite(led4, LOW);
    digitalWrite(led5, LOW);
    digitalWrite(led6, LOW);
    digitalWrite(led7, LOW);
  }
  else if (ocpot > 147 && ocpot <= 293) {
    digitalWrite(led1, HIGH);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, LOW);
    digitalWrite(led4, LOW);
    digitalWrite(led5, LOW);
    digitalWrite(led6, LOW);
    digitalWrite(led7, LOW);

  } else if (ocpot > 294 && ocpot <= 438) {
    digitalWrite(led1, HIGH);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, HIGH);
    digitalWrite(led4, LOW);
    digitalWrite(led5, LOW);
    digitalWrite(led6, LOW);
    digitalWrite(led7, LOW);

  } else if (ocpot > 439 && ocpot <= 584) {
    digitalWrite(led1, HIGH);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, HIGH);
    digitalWrite(led4, HIGH);
    digitalWrite(led5, LOW);
    digitalWrite(led6, LOW);
    digitalWrite(led7, LOW);
  } else if (ocpot > 585 && ocpot <= 730) {
    digitalWrite(led1, HIGH);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, HIGH);
    digitalWrite(led4, HIGH);
    digitalWrite(led5, HIGH);
    digitalWrite(led6, LOW);
    digitalWrite(led7, LOW);
  } else if (ocpot > 731 && ocpot <= 876) {
    digitalWrite(led1, HIGH);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, HIGH);
    digitalWrite(led4, HIGH);
    digitalWrite(led5, HIGH);
    digitalWrite(led6, HIGH);
    digitalWrite(led7, LOW);
  } else {
    digitalWrite(led1, HIGH);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, HIGH);
    digitalWrite(led4, HIGH);
    digitalWrite(led5, HIGH);
    digitalWrite(led6, HIGH);
    digitalWrite(led7, HIGH);
  }
  if (octfo < 70) {             //this is for photo resistor
    digitalWrite(led, HIGH);
  } else {
    digitalWrite(led, LOW);
  }

}