Project13.Analog Temperature

Description

This module is based on the working principle of a thermistor (resistance varies with temperature change in the environment).It can sense temperature changes in the surrounding and send the data to the analog IO of Arduino board. All we need to do is to convert the sensor’s output data into degrees Celsius temperature via simple programming, finally displaying it on the monitor.

It’s both convenient and effective, thus it is widely applied to gardening, home alarm system and other devices.

Specification

  • Interface type: analog

  • Working voltage: 5V

  • Temperature range: -55℃～315℃

  • Size: 30*20mm

  • Weight: 3g

Connect

_images/13_bb.png

Code

int ThermistorPin = A0;
int Vo;
float R1 = 10000; // value of R1 on board
float logR2, R2, T;
float c1 = 0.001129148, c2 = 0.000234125, c3 = 0.0000000876741; //steinhart-hart coeficients for thermistor
void setup() {
Serial.begin(9600);
}
void loop() {
Vo = analogRead(ThermistorPin);
// R2 = R1 * (1023.0 / (float)Vo - 1.0); //calculate resistance on thermistor
R2 = R1 / ((1023.0 / (float)Vo) - 1.0);
logR2 = log(R2);
T = (1.0 / (c1 + c2*logR2 + c3*logR2*logR2*logR2)); // temperature in Kelvin
T = T - 273.15; //convert Kelvin to Celcius
// T = (T * 9.0)/ 5.0 + 32.0; //convert Celcius to Farenheit
Serial.print(Vo);
Serial.print("Temperature: ");
Serial.print(T);
Serial.println(" C");
delay(500);
}

Phenomenon

_images/13.jpg