Arduino lib for computing thermocouples measures and compensate cold junction voltage based on NIST tables and mosaic industries work.

Download source:

$ git clone https://github.com/apieum/thermocouple.git

Open Arduino Ide, in menu Sketch -> import lib click on "add library", select thermocouple folder (containing sources).

Then in menu sketch -> import lib you should see "thermocouple" entry.

Add the following at the begining of your sketch:

#include <Thermo.h>

Defaults units are millivolts and degree Celsius (Kelvin also available). To initialise a thermocouple you have to specify its type and optionnaly temperature unit.

Set a type E thermocouple with kelvin units

Thermocouple<TypeE, Kelvin> thermo;

Set a type E thermocouple with default unit (Celsius)

Thermocouple<TypeE> thermo;

Then to compute temperature from voltage (mV) with cold junction compensation (20.0°c by default) call method temperature(double voltage, double cold_junction_temperature=20.0)

Thermocouple<TypeE> thermo;
double temp = thermo.temperature(4.20, 25.0);
Serial.print("temperature: ");
Serial.println(temp);
# print something like:
temperature: 91.0

If you don't need cold junction compensation call hot_volt_to_temp(double voltage)

Thermocouple<TypeE> thermo;
double temp = thermo.hot_volt_to_temp(4.20);
Serial.print("temperature: ");
Serial.println(temp);
# print something like:
temperature: 68.0

To develop you need at least arduinounit and ino. I compile tests locally to have rapid feedback if you need help about it contact me.

Install ino:

$ sudo pip install ino

Use the file make.py to build and upload tests:

$ ./make.py build-tests
$ ./make.py upload-tests