Introduction: Thermocouple Amplifier and K-Type Thermocouple Interface With Arduino

This tutorial teaches the basics on using Thermocouple and Thermocouple Amplifier.

Step 1: Introduction


Thermocouple is used to measure temperature. However, the signal level produced by the thermocouple is very small, thus an amplifier is required to collect the signal produced and amplify the signals. In order to do the amplification job, thermocouple amplifier is specially designed to work with thermocouple.

Specification of Type-K Thermocouple:

  • Measurable Temperature Range: 0ᵒC ~ 1100ᵒC
  • Positive Terminal: Red
  • Negative Terminal: Blue
  • Works great with SN-6675

Specification of Thermocouple Amplifier:

  • Input Voltage: DC3.3V to 5V
  • Works great with Type-K Thermocouple

Step 2: Pin Definition

Step 3: Sample Hardware Installation

Step 4: Sample Source Code

To get the result, please download the sample source code attached below and upload it into Arduino.

*kindly download the attached MAX6675 Library for your own use.

Step 5: Result (1)

The reading shown on LCD screen when thermocouple is being placed in a room.

Accuracy: ±3~5ᵒC

Step 6: Result (2)

The reading shown on LCD screen when the thermocouple is being heated by using a lighter for few seconds.

Accuracy: ±3~5ᵒC

Step 7: Result (3)

The reading shown on LCD screen when thermocouple is being immersed in a container of water.

Accuracy: ±3~5ᵒC

Step 8: Video


AsmaK12 (author)2017-03-13

how to branch max6675 with a micro controller 16f84

JCCarey5 (author)2017-01-08

is there a way to take out celsius and add a average over 5 min on the second line of the display