Water Level and Stepper

//www.elegoo.com
//2016.12.9

const int pinWater = 0;
int historyWaterLevel = 0;
char printBuffer[128];
int minimum= 0;
int maximum= 400;
int pourOnceTime = 1000;
int settleDelay =1000;
const int pinLEDgreen=2;
const int pinLEDred=3;

#include <Stepper.h>

const int stepsPerRevolution = 500;  // change this to fit the number of steps per revolution

// initialize the stepper library on pins 8 through 11:
Stepper myStepper(stepsPerRevolution, 8, 10, 9, 11);

void setup()
{
  Serial.begin(9600);
  // set the speed at 20 rpm:
  myStepper.setSpeed(20);
  pinMode (pinLEDgreen, OUTPUT);
  pinMode (pinLEDred, OUTPUT);

}

void loop()
{
    int waterLevel = analogRead(pinWater); // get adc waterLevel

//    if(((historyWaterLevel>= waterLevel) && ((historyWaterLevel - waterLevel) > 10)) || ((historyWaterLevel<waterLevel) && ((waterLevel - historyWaterLevel) > 10)))
//    {
//      sprintf(printBuffer, "ADC%d level is %d\n", pinWater, waterLevel);
//      Serial.println(printBuffer);
//      historyWaterLevel = waterLevel;
//    }

      Serial.println (waterLevel);

      while (waterLevel>= minimum && waterLevel<=maximum)
      {

         pourOnce(.75);
         waterLevel = analogRead(pinWater);
         Serial.println (waterLevel);
         digitalWrite (pinLEDred, HIGH);
         delay(100);
         digitalWrite (pinLEDgreen, LOW);
      }
}

void pourOnce(float angle)
{
  int steps=angle*500;
  myStepper.step(steps);
  delay(pourOnceTime);
  myStepper.step(-steps);
  delay(settleDelay);
}