#define ECHO_Pin 2
#define TRIG_Pin 3
void setup() {
  // put your setup code here, to run once:
  pinMode(ECHO_Pin , INPUT);
  pinMode(TRIG_Pin , OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(TRIG_Pin , HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_Pin , LOW);
  int dist = (pulseIn(ECHO_Pin , HIGH) / 58);
  digitalWrite(4 , HIGH);
  delay(dist * 8);
  digitalWrite(4 , LOW);
  delay(dist * 8);
}