const byte Trig = 13;
const byte E1 = 2 ;
const byte E2 = 3;
const byte E3 = 4;
const byte E4 = 5;
const byte E5 = 6;
const byte E6 = 7;
const byte E7 = 8;
const byte E8 = 9;

void setup() {
  pinMode (Trig,OUTPUT);
  pinMode (E1,INPUT);
  pinMode (E2,INPUT);
  pinMode (E3,INPUT);
  pinMode (E4,INPUT);
  pinMode (E5,INPUT);
  pinMode (E6,INPUT);
  pinMode (E7,INPUT);
  pinMode (E8,INPUT);
  Serial.begin(9600);
}

void loop() {
  long distance1,distance2,distance3,distance4,distance5,distance6,distance7,distance8,period1,period2,period3,period4,period5,period6,period7,period8;

  // Sensor 1 send
  digitalWrite(Trig, LOW);
  delayMicroseconds(3);
  digitalWrite(Trig,HIGH);
  delayMicroseconds(10);
  digitalWrite(Trig,LOW);
  //Sensor 1 recive
  period1 = pulseIn(E1,HIGH);
  //Sensor 1 Distance
  distance1 = period1 /29 / 2;
  Serial.print("Slot1: ");
  Serial.print(distance1);
  Serial.print("cm");
  Serial.println();
  delay(1000);

  // Sensor 2 send
  digitalWrite(Trig, LOW);
  delayMicroseconds(3);
  digitalWrite(Trig,HIGH);
  delayMicroseconds(10);
  digitalWrite(Trig,LOW);
  //Sensor 2 recive
  period2 = pulseIn(E2,HIGH);
  //Sensor 7 Distance
  distance2 = period2 /29 / 2;
  Serial.print("Slot2: ");
  Serial.print(distance2);
  Serial.print("cm");
  Serial.println();
  delay(1000);

  // Sensor 3 send
  digitalWrite(Trig, LOW);
  delayMicroseconds(3);
  digitalWrite(Trig,HIGH);
  delayMicroseconds(10);
  digitalWrite(Trig,LOW);
  //Sensor 3 recive
  period3 = pulseIn(E3,HIGH);
  //Sensor 7 Distance
  distance3 = period3 /29 / 2;
  Serial.print("Slot3: ");
  Serial.print(distance3);
  Serial.print("cm");
  Serial.println();
  delay(1000);

  // Sensor 4 send
  digitalWrite(Trig, LOW);
  delayMicroseconds(3);
  digitalWrite(Trig,HIGH);
  delayMicroseconds(10);
  digitalWrite(Trig,LOW);
  //Sensor 4 recive
  period4 = pulseIn(E4,HIGH);
  //Sensor 7 Distance
  distance4 = period4 /29 / 2;
  Serial.print("Slot4: ");
  Serial.print(distance4);
  Serial.print("cm");
  Serial.println();
  delay(1000);

  // Sensor 5 send
  digitalWrite(Trig, LOW);
  delayMicroseconds(3);
  digitalWrite(Trig,HIGH);
  delayMicroseconds(10);
  digitalWrite(Trig,LOW);
  //Sensor 5 recive
  period5 = pulseIn(E5,HIGH);
  //Sensor 7 Distance
  distance5 = period5 /29 / 2;
  Serial.print("Slot5: ");
  Serial.print(distance5);
  Serial.print("cm");
  Serial.println();
  delay(1000);

  // Sensor 6 send
  digitalWrite(Trig, LOW);
  delayMicroseconds(3);
  digitalWrite(Trig,HIGH);
  delayMicroseconds(10);
  digitalWrite(Trig,LOW);
  //Sensor 1 recive
  period6 = pulseIn(E6,HIGH);
  //Sensor 7 Distance
  distance6 = period6 /29 / 2;
  Serial.print("Slot6: ");
  Serial.print(distance6);
  Serial.print("cm");
  Serial.println();
  delay(1000);

  // Sensor 7 send
  digitalWrite(Trig, LOW);
  delayMicroseconds(3);
  digitalWrite(Trig,HIGH);
  delayMicroseconds(10);
  digitalWrite(Trig,LOW);
  //Sensor 7 recive
  period7 = pulseIn(E7,HIGH);
  //Sensor 7 Distance
  distance7 = period7 / 29 / 2;
  Serial.print("Slot7: ");
  Serial.print(distance7);
  Serial.print("cm");
  Serial.println();
  delay(1000);

  // Sensor 8 send
  digitalWrite(Trig, LOW);
  delayMicroseconds(3);
  digitalWrite(Trig,HIGH);
  delayMicroseconds(10);
  digitalWrite(Trig,LOW);
  //Sensor 8 recive
  period7 = pulseIn(E8,HIGH);
  //Sensor 8 Distance
  distance8 = period8 / 29 / 2;
  Serial.print("Slot8: ");
  Serial.print(distance7);
  Serial.print("cm");
  Serial.println();
  delay(1000);
}