Working code for LEDs graphing distance with a PING))) sensor

success

const int pingPin = 10;

int ledPins[] = { 
  2, 3, 4, 5, 6, 7, 8 };       // an array of pin numbers to which LEDs are attached
int pinCount = 7; 

long duration, inches, cm;

void setup() {
  // initialize serial communication:
  Serial.begin(9600);

  for (int thisPin = 0; thisPin < pinCount; thisPin++)  {
    pinMode(ledPins[thisPin], OUTPUT);      
  }

}

void loop()
{
  runPing();
  setPair(0, HIGH);

}

void setPair(int thisPin, int state)
{
  digitalWrite(ledPins[thisPin], state);
  digitalWrite(ledPins[thisPin+1], state);
}

long runPing(){

  pinMode(pingPin, OUTPUT);
  digitalWrite(pingPin, LOW);
  delayMicroseconds(2);
  digitalWrite(pingPin, HIGH);
  delayMicroseconds(5);
  digitalWrite(pingPin, LOW);

  pinMode(pingPin, INPUT);
  duration = pulseIn(pingPin, HIGH);

  // convert the time into a distance
  cm = microsecondsToCentimeters(duration);

  Serial.print(cm);
  Serial.print("cm");
  Serial.println();

  delay(300);
  test();
}

long microsecondsToCentimeters(long microseconds)
{
  // The speed of sound is 340 m/s or 29 microseconds per centimeter.
  // The ping travels out and back, so to find the distance of the
  // object we take half of the distance travelled.
  return microseconds / 29 / 2;
}

void test(){
  if (cm > 76 && cm < 122){
    setPair(2, HIGH);
  }
  else if(cm > 122){
    setPair(2, LOW);
  }

  if (cm > 46 && cm < 76){
    setPair(4, HIGH);
    setPair(2, HIGH);
  }
  else if(cm > 76){
    setPair(4, LOW);
  }

  if (cm < 46){
    digitalWrite(ledPins[6], HIGH);  //Red LEDs group 3

    for (int thisPin = 0; thisPin < pinCount; thisPin++) { 
      // turn the pin on:
      digitalWrite(ledPins[thisPin], HIGH);   
      delay(100);                  
      // turn the pin off:
      digitalWrite(ledPins[thisPin], LOW);   
    }
  }
  else if (cm > 46){
    digitalWrite(ledPins[6], LOW);
  }
}