Best spud soil temp reader so far

#include <avr/sleep.h>
#include <avr/power.h>
#include <EEPROM.h>
#include <avr/wdt.h>
#define LED_PIN (13)
#define ENOUGH_READINGS 4   //how many readings til its time to write to eeprom
#define E ENOUGH_READINGS

int value =22;
int value2=33;
int wdtCtr,wdCtrLimit=0;
int toEepromArCtr=0;
int sensorPin = 0; //the analog pin the TMP36's Vout (sense
int readingsAr[256];
int toEepromAr[256];    //these values go into eeprom

void setup() {
  Serial.begin(115200);
   Serial.println("Initialising...");


  delay(100); //Allow for serial print to complete.

  pinMode(LED_PIN,OUTPUT);
   MCUSR &= ~(1<<WDRF);

  /* In order to change WDE or the prescaler, we need to
   * set WDCE (This will allow updates for 4 clock cycles).
   */
  WDTCSR |= (1<<WDCE) | (1<<WDE);

  /* set new watchdog timeout prescaler value */
 // WDTCSR = 1<<WDP0 | 1<<WDP3; /* 8.0 seconds */
   WDTCSR =  1<<WDP3; /* 4.0 seconds */
  /* Enable the WD interrupt (note no reset). */
  WDTCSR |= _BV(WDIE);

  Serial.println("Initialisation complete.");
  delay(100); //Allow for serial print to complete
}

void loop() {
  delay(550);
 // digitalWrite(LED_PIN, !digitalRead(LED_PIN));
  digitalWrite(LED_PIN,HIGH); //read some sensor
  //delay(500);
  int reading = analogRead(sensorPin); //do some sensor work
 // Serial.print("Reading>>");
  Serial.println(reading);
  readingsAr[wdtCtr]=reading;
  Serial.println(wdtCtr);
  if(wdtCtr>=ENOUGH_READINGS){
    Serial.println("Enough");
    printReadingsAr();
    Serial.println(meanReading());
    //toEepromArCtr++;    //counts bytes going into eeprom
    EEPROM.write(toEepromArCtr++, meanReading());
    showEeprom();
    wdtCtr = 0;
  }
//  digitalWrite(LED_PIN,LOW);
  //Serial.print(value++);
  delay(3);     //take out later
   enterSleep();
  //Serial.println(value2);
}
ISR(WDT_vect) {
  value2++;
  wdtCtr++;
   Serial.println("W");
}
void enterSleep(void)
{
  set_sleep_mode(SLEEP_MODE_PWR_SAVE);   /* EDIT: could also use SLEEP_MODE_PWR_DOWN for lowest power consumption. */
  sleep_enable();

  /* Now enter sleep mode. */
  digitalWrite(LED_PIN, !digitalRead(LED_PIN));//now sleeping (nearly)
  sleep_mode();

  /* The program will continue from here after the WDT timeout*/
  sleep_disable(); /* First thing to do is disable sleep. */

  /* Re-enable the peripherals. */
  power_all_enable();
}
void printReadingsAr(void) {
  for (int i =0;i<=ENOUGH_READINGS;i++) {
    Serial.print(readingsAr[i]);
    Serial.println("*");
  }
}
int meanReading (void){
  int total=0;
  for(int i =0;i<E;i++){
    total = total + readingsAr[i];
  }
  return total/E;
}
void showEeprom(void) {
  int value;
  for (int i =0;i<10;i++) {
    value = EEPROM.read(i);
    Serial.print(value);
    Serial.println("e");
  }
}