Marcazzan_M
Published © GPL3+

How Easy Is It to Use a Thermistor?!

Thermistor as thermometer.

IntermediateFull instructions provided69,814
How Easy Is It to Use a Thermistor?!

Things used in this project

Hardware components

Thermistor NTC 10K
×1
Resistor 10k ohm
Resistor 10k ohm
×1
Arduino UNO
Arduino UNO
×1
Jumper wires (generic)
Jumper wires (generic)
×1
Breadboard (generic)
Breadboard (generic)
×1

Software apps and online services

Arduino IDE
Arduino IDE
Arduino Web Editor
Arduino Web Editor

Story

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Schematics

termistore_bb.jpg

termistore_schem.jpg

Code

Thermistor

Arduino
//Thermometer with thermistor

/*thermistor parameters:
 * RT0: 10 000 Ω
 * B: 3977 K +- 0.75%
 * T0:  25 C
 * +- 5%
 */

//These values are in the datasheet
#define RT0 10000   // Ω
#define B 3977      // K
//--------------------------------------


#define VCC 5    //Supply voltage
#define R 10000  //R=10KΩ

//Variables
float RT, VR, ln, TX, T0, VRT;

void setup() {
  Serial.begin(9600);
  T0 = 25 + 273.15;                 //Temperature T0 from datasheet, conversion from Celsius to kelvin
}

void loop() {
  VRT = analogRead(A0);              //Acquisition analog value of VRT
  VRT = (5.00 / 1023.00) * VRT;      //Conversion to voltage
  VR = VCC - VRT;
  RT = VRT / (VR / R);               //Resistance of RT

  ln = log(RT / RT0);
  TX = (1 / ((ln / B) + (1 / T0))); //Temperature from thermistor

  TX = TX - 273.15;                 //Conversion to Celsius

  Serial.print("Temperature:");
  Serial.print("\t");
  Serial.print(TX);
  Serial.print("C\t\t");
  Serial.print(TX + 273.15);        //Conversion to Kelvin
  Serial.print("K\t\t");
  Serial.print((TX * 1.8) + 32);    //Conversion to Fahrenheit
  Serial.println("F");
  delay(500);

}

Credits

Marcazzan_M

Marcazzan_M

6 projects • 67 followers
I'm an Italian student, I'm studying electronic engineering. Sufficiently advanced technology is indistinguishable from magic.

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