This is the GitHub source code repository for the Arduino MAX31855 library and example code for Arduino.

Maxim has released a newer version of this IC called MAX31856.  You can find the library here:
https://github.com/engineertype/MAX31856

This library offers advantages over other MAX31855 libraries:
a. Returns both the junction (IC) and thermocouple temperatures
b. Handles negative temperatures
c. Returns thermocouple error codes, like open, short-to-ground and short-to-vcc
d. Returns an error if the MAX31855 isn’t communicating (wiring issue?)

In this folder are:
1. README - this file
2. MAX31855—1-schematic.png - Hardware schematic for the MAX31855 board
3. MAX31855—2-schematic.png - Hardware schematic for the dual MAX31855 board
4. MAX31855—4-schematic.png - Hardware schematic for the quad MAX31855 board
5. MAX31855 folder - the Arduino library and example code for driving the MAX31855
6. MAX31855_RPi - Sample code for the Raspberry Pi (Octo boards)

To install the MAX31855 library, please refer to:
http://arduino.cc/en/Guide/Libraries

Breakout boards are available on eBay.  Please buy them and support my open-source efforts!
5V Single    http://www.ebay.com/itm/301193478531 (sold out)
5V Dual      http://www.ebay.com/itm/301214589468
5V Quad      http://www.ebay.com/itm/301200852126 (sold out)
5V Octo      http://www.ebay.com/itm/251802776832 
3.3V Single  http://www.ebay.com/itm/301208636998 (sold out)
3.3V Dual    http://www.ebay.com/itm/301208677221 (sold out)
3.3V Quad    http://www.ebay.com/itm/251704050290 (sold out)
3.3V Octo    http://www.ebay.com/itm/301498690366

Take a look at the new MAX31856 boards.  Much better accuracy and flexibility!

Looking to build a reflow oven?  Check out the build guide:
http://whizoo.com/reflowoven

Peter Easton 2017
Whizoo.com