#define trigPin 12
#define echoPin 13

long duration;
int distance;
int wall = 290;

void setup() {
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  // create trigger pulse
  digitalWrite(trigPin, LOW);         // turn off pulses
  delayMicroseconds(2);               // pause before transmitting
  digitalWrite(trigPin, HIGH);        // transmit pulses...
  delayMicroseconds(10);              // ...for 10 microseconds
  digitalWrite(trigPin, LOW);         // turn off pulses
  duration = pulseIn(echoPin, HIGH);  // time the echo

  for (int i = 0; i < duration / wall; i++) { // create graph of echo
    Serial.print("*");
  }
  for (int i = 0; i < 80 - (duration / wall); i++ ) { // fill the cube to 100
    Serial.print(" ");
  }
  Serial.println("|");
  delay(100);
}