pH sensor circuit v1.1 arduino ide code

Projects Programming
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Respected Sir,
I'm not able to write the pH code for pH circuit v1.1. Please help me in writing and successfully uploading it to Arduino ATMega 2560. I'd be very thankful if you help me in achieving this.

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If anyone wants to help, the instructions for the DFRobotics "pH meter V1.1" (SKU: SEN0161) are here:
http://wiki.dfrobot.com.cn/index.php/(SKU:SEN0161)pH_meter_V1.1_pH%E8%AE%A1V1.1

The example sketch is on that page. It compiles fine for UNO and MEGA 2560 so I don't know what the problem is.

/*
  # This sample code is used to test the pH meter V1.1.
  # Editor : YouYou
  # Ver    : 1.1
  # DAT    : 2014.06.23
  # Product: analog pH meter V1.1
  # SKU    : SEN0161
*/
#define SensorPin A2            //pH meter Analog output to Arduino Analog Input 2
#define Offset 0.00            //deviation compensate
#define LED 13
#define samplingInterval 20
#define printInterval 800
#define ArrayLenth  40    //times of collection
int pHArray[ArrayLenth];   //Store the average value of the sensor feedback
int pHArrayIndex = 0;
void setup(void)
{
  pinMode(LED, OUTPUT);
  Serial.begin(9600);
  Serial.println("pH meter experiment!");    //Test the serial monitor
}
void loop(void)
{
  static unsigned long samplingTime = millis();
  static unsigned long printTime = millis();
  static float pHValue, voltage;
  if (millis() - samplingTime > samplingInterval)
  {
    pHArray[pHArrayIndex++] = analogRead(SensorPin);
    if (pHArrayIndex == ArrayLenth)pHArrayIndex = 0;
    voltage = avergearray(pHArray, ArrayLenth) * 5.0 / 1024 + 0.05;
    pHValue = 3.5 * voltage + Offset;
    samplingTime = millis();
  }
  if (millis() - printTime > printInterval)  //Every 800 milliseconds, print a numerical, convert the state of the LED indicator
  {
    Serial.print("Voltage:");
    Serial.print(voltage, 2);
    Serial.print("    pH value: ");
    Serial.println(pHValue, 2);
    digitalWrite(LED, digitalRead(LED) ^ 1);
    printTime = millis();
  }
}


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;
}