Thermistor

Arduino-like Library to Work with Thermistor Sensor

Thermistor is a Temperature Sensor whose resistance varies as its temperature varies. You could find many kinds of thermistors, this library controls a NTC type.

Simple Connection

Sensor characteristics you need to know

RO: Resistance of Operation - Thermistor resistance at 25^oC. Common Value: 10000 ohms

Rf: Resistance of Reference - Resistor connected in series with thermistor. Making an Voltage Divider. Common Value: 10000ohms

Beta: Thermistor constant, is a resistance-temperature characteristic used to calculate the temperature. Common Value: 3977

Or

Steinhart-Hart constants: Constants A,B,C for more precise temperature calculation.

How to use this library

• Download and include this library using Arduino IDE.
• Include the header.

#include <Thermistor.h>

• Create a Sensor Object.

There are many ways to do this.

Using default parameters.

Thermistor sensor;

There are other initialization parameters. You could pass the pin which the sensor is connected, the resistance of operation, resistance of reference, the beta constante and pass the steinhart-hart constants.

Ex:

Thermistor sensor(A0, 10000, 4700,3800); // Passing the PIN: A0, RO: 10.000, Rf: 4.7K, and Beta: 3800

To get Temperature:

float temperature = sensor.getTemperature();

float fahrenheit = sensor.getTemperature('F');

See examples to Know more details.