Arduino Thermometer, LCD Display, Thermistor





Introduction: Arduino Thermometer, LCD Display, Thermistor

*** This project is no longer supported, the arduino code is outdated and no longer works, my arduino broke so I can't fix it, if you have a fix feel free to PM me! ***

Its an arduino project, creating a temperature measurer, with a thermistor, and outputs to an lcd display

Plug the thermistor in A0 through 5v
and follow the schematic, to hook up the lcd...

Parts list:
1,  2X16 white on black LCD
1, 10k Thermistor
1, Variable Resistor
1, Breadboard
1, 10k resistor
1, Arduino ( I use UNO)
1, 9v battery (Optional)
1, DC plug adaptor for 9v battery (Optional)

Here's the code

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

double Thermister(int RawADC) {
 double Temp;
 Temp = log(((10240000/RawADC) - 10000));
 Temp = 1 / (0.001129148 + (0.000234125 * Temp) + (0.0000000876741 * Temp * Temp * Temp));
 Temp = Temp - 273.15; // Convert Kelvin to Celcius

 return Temp;

void setup() {



void loop() {
 Serial.println(int(Thermister(analogRead(0)))); // display Fahrenheit


lcd.print(" degress C");





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    14 Discussions

    can anyone please tell me why RawADC is undefined in my code

    Thanks in advance

    1 reply

    Hi! I am making a project on temperature measurements with arduino uno and thermistor. I am using the voltage divider method to determine the resistance of the thermistor, and the steinhart model for temperature calculations. However, when I tested it on a boiling water the resistance obtained by the setup where not the same on the multimeter readings, so that, instead of obtaining a temperature of 100 deg Celsius I obtained higher than that ranging from 101 deg Celsius-116 deg Celsius. Do you have any suggestions on how can I fix that?

    can anyone please tell me why RawADC is undefined in my code

    Thanks in advance

    I need your help;; in my project simply i have to read analod values ,amplify it and have to display on the lcd but my serial monitor and lcd are showing different values..please help.

    1 reply

    same here.. when i verify the program, it says that "Lcd crystal does not name a type".. what to do guys?..

    hi, can you help me your code says lcd. was not declared in this scope. what should I do?

    Mine predicted global warming......
    It reads 351*C All the time....
    I didnt have an LCD Screen handy at the time, so I changed the code to send it to serial....
    What have I done wrong??

    1 reply

    I'm not the author, but maybe I can help. Can you post the code you are using?

    Did you miss this line: "Temp = Temp - 273.15;" To convert from Kelvin to Celsius?

    I can not find the list of parts used. Or how to build it. Could you help out a little more. Looks like a good project.

    1 reply

    never mind i didnt know the math library was automatically included, but not actually in the libraries folder

    i cant seem to find where to download the math library, could you send me the link?