Tiny ADC

//ATTiny85 being used to provide ADC input to the Raspberry Pi(tm)
// There will be a pair of TMP36 temp sensors hooked to Analog 2 and 3
// Sketch written by Brian Schulteis (UnaClocker) licensed Creative Commons

#define rxPin 0
#define txPin 1
#define zoneOneSensor 3
#define zoneTwoSensor 2
#include <SoftwareSerial.h>

unsigned long zoneOneAverage=0;
unsigned long zoneTwoAverage=0;
long readingTimer=0;
char fromPi, *iHatePointers;
int temporary=0;
SoftwareSerial cereal(rxPin, txPin);


void setup() {
  pinMode(zoneOneSensor, INPUT);
  pinMode(zoneTwoSensor, INPUT);
  analogReference(INTERNAL);
  cereal.begin(9600);
  for (int i=0; i<=20; i++) {
    zoneOneAverage += analogRead(zoneOneSensor);
  }
  for (int i=0; i<=20; i++) {
    zoneTwoAverage += analogRead(zoneTwoSensor);
  }
  readingTimer=millis();
}

void sendZoneData(int zoneNumber) {
  if (zoneNumber==1) {
    cereal.print(zoneOneAverage/20);
  }
  else {
    cereal.print(zoneTwoAverage/20);
  }
}

void loop() {
  if (cereal.available()) {// Check for data in on the serial port
    fromPi=cereal.read();
    //cereal.print(fromPi); //diagnostics
    if (fromPi=='Z') {// Z is the request Zone command
      if (cereal.available()) { // make sure there's data available
        fromPi=cereal.read(); // read the zone requested.
        //cereal.print(fromPi); //diagnostics
        *iHatePointers=fromPi;// link the pointer to the variable?
        int zoneRequested=atoi(iHatePointers); // atoi converts a char to an int
        if ((zoneRequested>0) && (zoneRequested<3)) { // make sure we got a valid zone request
          sendZoneData(zoneRequested); // call the subroutine to transmit the temperature of that zone
        }
        while (cereal.available()) {
          fromPi=cereal.read(); // flush the incoming buffer
        }
      }
    }
  }
  if ((millis()-readingTimer) > 1000) { // once every second
    int averageTemp = zoneOneAverage/20; // get one sample out
    zoneOneAverage -= averageTemp; // remove that sample
    averageTemp=analogRead(zoneOneSensor); // Switch ADCs, toss out first reading
    delay(2); // Delay to allow ADC to normalize
    zoneOneAverage += analogRead(zoneOneSensor); // add a new sample to the record
    averageTemp = zoneTwoAverage/20;
    zoneTwoAverage -= averageTemp;
    averageTemp=analogRead(zoneTwoSensor); // Switch ADCs, toss out first reading
    delay(2); // Delay to allow ADC to normalize
    zoneTwoAverage += analogRead(zoneTwoSensor);
    readingTimer=millis(); // reset the timer
    //cereal.println("Tick Tock"); // diagnostics=]
  }
}