MAX31855 Thermocouple Amplifier Gain and Output

Breakout boards, sensors, other Adafruit kits, etc.

Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.
Locked
kpld
 
Posts: 1
Joined: Thu Mar 21, 2013 11:17 am

MAX31855 Thermocouple Amplifier Gain and Output

Post by kpld »

For the MAX31855 thermocouple amplifier listed on the website (http://www.adafruit.com/products/269), I couldn't find any information on the gains I would be able to get for my temperature readings. Also, is the output digital or analog? I am not very familiar with SPI.

User avatar
redwire
 
Posts: 22
Joined: Tue Dec 18, 2012 2:24 pm

Re: MAX31855 Thermocouple Amplifier Gain and Output

Post by redwire »

The MAX31855 family has fixed gain and is designed to be used with specific thermocouples; they're optimized and trimmed according to the part number suffix i.e. MAX31855K is for type-K thermocouples.
The chip digitizes both the thermocouple and cold-junction temperaure and outputs the data serially via SPI.

There is an Arduino library here, from Rocket Scream and their Open Source PID controller: https://github.com/rocketscream/MAX31855
This shows how to massage the data into a temperature.

Locked
Please be positive and constructive with your questions and comments.

Return to “Other Products from Adafruit”