Hi all. I have been working towards my first (hopefully permanent) Arduino project 
I want to display some temperatures on an LCD and possibly add humidity later.
I have been working on some code (with some help from DC42 many thanks for that)
I have noticed how much the readings fluctuate - noise I guess and I would like to eradicate some of this. I get a swing of about 1.5 degrees c most of the time. I thought about averaging the readings but can't get the code to compile and I'm stuck on that 
Or Would I be better of scrapping using thermistors and dividers and trying to use digital readers?
The code below is what I have so far. I'm also dimming the LCD back light by reading a LDR which is working nicely.
/*
The circuit:
* LDR connected to analog pin 0.
* LED / transistor connected from digital pin 3 to ground
* LCD RS pin to digital pin 7
* LCD EN pin to digital pin 8
* LCD D4 pin to digital pin 9
* LCD D5 pin to digital pin 10
* LCD D6 pin to digital pin 11
* LCD D7 pin to digital pin 12
* LCD R/W pin to ground
* 10K resistor:
* ends to +5V and ground
* wiper to LCD VO pin (pin 3)
* LCD LED+ (15) pin transistor
* LCD LED- (16) to ground
* Thermisor divider 1 output to analog pin 1
* Thermisor divider 2 output to analog pin 2
*/
// These constants won't change. They're used to give names
// to the pins used:
const int analogInPin = A0; // Analog input pin that the lDR is attached to
const int analogOutPin = 3; // Analog output pin that the LED is attached to
const int minLight = 100; // at or below this light level, use minimum backlight intensity
const int maxLight = 900; // at or above this light level, use maximum backlight intensity
const int minBacklight = 5; // lowest backlight intensity to use
const int maxBacklight = 255; // highest backlight intensity to use
// include the library code:
#include <LiquidCrystal.h>
#undef float
#define NUMSAMPLES 5
int samples[NUMSAMPLES];
#include <math.h>
double average(int RawADC) {
double Temp;
Temp = log(((10240000/RawADC) - 10000));
Temp = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * Temp * Temp ))* Temp );
Temp = Temp - 273.15; // Convert Kelvin to Celcius
return Temp;
}
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);
int sensorValue = 0; // value read from the LDR
int outputValue = 0; // value output to the PWM (analog out)
void setup() {
// initialize serial communications at 9600 bps:
Serial.begin(9600);
lcd.begin(16, 2);
delay(100);
pinMode(13, OUTPUT);
}
void loop() {
// read the analog in value:
analogRead(analogInPin);
delay(200);
sensorValue = analogRead(analogInPin);
// map it to the range of the analog out:
outputValue = map(constrain(sensorValue, minLight, maxLight), minLight, maxLight, minBacklight, maxBacklight );
// change the analog out value:
analogWrite(analogOutPin, outputValue);
// print the results to the serial monitor:
Serial.print("sensor = " );
Serial.print(sensorValue);
Serial.print("\t output = ");
Serial.println(outputValue);
uint8_t i;
float average;
// take N samples in a row, with a slight delay
for (i=0; i< NUMSAMPLES; i++) {
samples[i] = analogRead(1)), 1);
delay(10);
}
// average all the samples out
average = 0;
for (i=0; i< NUMSAMPLES; i++) {
average += samples[i];
}
average /= NUMSAMPLES;
//Temperature 1 print
lcd.clear();
lcd.setCursor(0,0);
lcd.print ("Out: ");
lcd.print(average(analogRead(1)), 1);
lcd.print((char)223);
lcd.print ("c");
//Serial.print ("Temp1=");
//Serial.println(int(Thermister(analogRead(1)))); // display temp
// Temperature 2 print
//lcd.setCursor(0,1);
//lcd.print(int(Thermister(analogRead(2, 1))));
//lcd.print((char)223);
//lcd.print ("c");
//Serial.print ("Temp2=");
//Serial.println(int(Thermister(analogRead(2)))); // display temp
// wait 10 milliseconds before the next loop
// for the analog-to-digital converter to settle
// after the last reading:
delay(1000);
}