Thermometer

1/*
2Shout out to computers.tutsplus.com/tutorials/how-to-read-temperatures-with-arduino--mac-53714
3
4
5  The LCD:
6 * LCD RS pin to digital pin 12
7 * LCD Enable pin to digital pin  11
8 * LCD D4 pin to digital pin 5
9 * LCD D5 pin to digital pin 4
10 * LCD  D6 pin to digital pin 3
11 * LCD D7 pin to digital pin 2
12 * LCD R/W pin to ground
13  * LCD VSS pin to ground
14 * LCD VCC pin to 5V
15 * 220 ohm resistor:
16 * end  to ground and 5V
17 * wiper to LCD VO pin (pin 3)
18 * 
19  The Thermistor:
20  * 5Vto positive leg of thermistor
21 * Negative leg of thermistor to 100K ohm resistor  to GND
22 * Negative leg of thermistor to A0
23 * 
24  Button:
25 * Reset pin  to button
26 * Negative leg of button to gnd
27 */
28 
29
30// include library
31#include  <LiquidCrystal.h>
32
33// initialize the library with the numbers of the interface  pins
34LiquidCrystal lcd(6, 9, 5, 4, 3, 2);
35
36void setup() {
37  // the LCD  has 16 columns and two rows
38  lcd.begin(16, 2);
39  Serial.begin(9600);
40}
41
42//  Steinhart-Hart equation
43double Thermister(int RawADC) {  
44 double Temp;
45  Temp = log(((10240000/RawADC) - 10000));
46 Temp = 1 / (0.001129148 + (0.000234125  + (0.0000000876741 * Temp * Temp ))* Temp );
47 Temp = Temp - 273.15;              //  Kelvin to Celsius
48 Temp = (Temp * 9.0)/ 5.0 + 32.0; // Celsius to Fahrenheit  
49 return Temp;
50}
51
52void loop() {
53  // set the cursor to column 0,  line 1
54  lcd.setCursor(0, 1);
55  int val;                //Create and integer
56  double temp;            //Create "temp"
57  val=analogRead(A4);      //Read  A0 and store it
58  temp=Thermister(val) - 9;   
59  Serial.println(temp);   //Print  to the serial monitor
60  delay(500);            //Wait half a second before we  do it again
61  lcd.setCursor(0,0); //Set cursor
62  lcd.print(String(temp) +  " F");  //Print to the LCD
63  
64  
65}