#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include <Stepper.h>
const int stepsPerRevolution = 200;
Stepper myStepper(stepsPerRevolution, 2, 4, 5, 18);
void setup()
{
  Wire.begin(23, 22);
  Serial.begin(9600);
  myStepper.setSpeed(60);
}

void loop()
{
    int16_t doam = analogRead(15);
    Serial.print(doam);
    if(doam <=500)
    {
      myStepper.step(stepsPerRevolution);
    }
    else
    {
      myStepper.step(-stepsPerRevolution);
    }
    delay(1000);
}