#include <Stepper.h>
#define PIN_TRIG 3
#define PIN_ECHO 2

const int stepsPerRevolution = 200;

Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);

void setup() {
  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
   myStepper.setSpeed(60);
}

void loop() {
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);


  int x = pulseIn(PIN_ECHO, HIGH);
  Serial.print("Distance in CM: ");
  Serial.println(x / 58);
  Serial.print("Distance in inches: ");
  Serial.println(x / 148);

  delay(1000);
if (x <= 100){
Serial.print("Distance in CM: ");
Serial.println(x / 58);
myStepper.step(stepsPerRevolution);

}
}