Water Purifier Helper

#include <SoftwareSerial.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#define SensorPin A1            //pH meter Analog output to Arduino Analog Input 0
#define Offset 0.00            //deviation compensate
#define samplingInterval 20
#define printInterval 800
#define ArrayLenth  40    //times of collection
#define ONE_WIRE_BUS 2 //온도센서 디지털 핀번호 

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

int pHArray[ArrayLenth];   //Store the average value of the sensor feedback
int pHArrayIndex = 0;
int pin = 2;

//int DS18S20 = 3;
//OneWire ds(DS18S20);
 SoftwareSerial myserial(10,11);//TX,RX
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  myserial.begin(9600);
  sensors.begin();
}

void loop() {
  // put your main code here, to run repeatedly:
  static unsigned long samplingTime = millis();
  static unsigned long printTime = millis();
  static float pHValue, voltage, tak;
  //sensors.requestTemperatures();
  
  //Serial.println(takSensor);
  //Serial.println(temp);

  if (millis() - samplingTime > samplingInterval)
  {
    pHArray[pHArrayIndex++] = analogRead(SensorPin);
    
    if (pHArrayIndex == ArrayLenth)
    {
      pHArrayIndex = 0;
    }
    voltage = avergearray(pHArray, ArrayLenth) * 5.0 / 1024;
    pHValue = 3.5 * voltage + Offset;
    samplingTime = millis();
  }
  
  if ((millis() - printTime > printInterval))
  {
    int sensorValue = analogRead(A0);
    float volt = sensorValue * (5.0 / 1024.0);    

    //Serial.print(sensors.getTempCByIndex(0));
    sensors.requestTemperatures();
    float c = sensors.getTempCByIndex(0);
    
    if(pHValue>5.8 && pHValue < 8.4 && volt >= 3.8 && volt <= 4.4)
    {
      myserial.print("Quality is Good, \n");
      myserial.print("Temp : ");
      myserial.print(c);  
      myserial.println(" C");

      Serial.print("Good, ");
      Serial.print("Temp : ");
      Serial.println(c); 
    }
    else
    {
      myserial.print("Quality is Bad, \n");
      myserial.print("Temp : ");
      myserial.print(c);
      myserial.println(" C");

      Serial.print("Bad, ");
      Serial.print("Temp : ");
      Serial.println(c); 
    }
    delay(3000); //3초마다 Refresh
  }
}

double avergearray(int* arr, int number) {
  int i;
  int max, min;
  double avg;
  long amount = 0;
  if (number <= 0) {
    Serial.println("Error number for the array to avraging!/n");
    return 0;
  }
  if (number < 5) { //less than 5, calculated directly statistics
    for (i = 0; i < number; i++) {
      amount += arr[i];
    }
    avg = amount / number;
    return avg;
  } else {
    if (arr[0] < arr[1]) {
      min = arr[0]; max = arr[1];
    }
    else {
      min = arr[1]; max = arr[0];
    }
    for (i = 2; i < number; i++) {
      if (arr[i] < min) {
        amount += min;      //arr<min
        min = arr[i];
      } else {
        if (arr[i] > max) {
          amount += max;  //arr>max
          max = arr[i];
        } else {
          amount += arr[i]; //min<=arr<=max
        }
      }//if
    }//for
    avg = (double)amount / (number - 2);
  }//if
  return avg;
}