The Yocto-Thermocouple device is a USB temperature sensor. It will let you perform via USB instant temperature measurements on two thermocouple inputs, as well as as record the measures on its internal flash for later retrieval when connected again by USB. Thanks to the use of thermocouples, this tiny module can measure the temperature of liquids, small objects, food, mechanical pieces, ovens, etc. It is very reactive to quick temperature changes (detection in 30 [ms], stable measure in 100 [ms]).

The use of thermocouple makes it easy to measure a temperature away from the module. However, if you would need to measure something dozens of meters away, you can avoid to use an expensive long thermocouple by moving the thermocouple inputs further away from the USB connector: simply split the board into two parts and solder a 4-wire cable on the designated pads.

This device ships with two 50cm fine-wire twisted-pair thermocouple cables type K, which can be used to measure temperatures between -75░C and 260░C (PFA isolated, measure point non-isolated). To use a wider measure range of the device, you can use any more sophisticated thermocouple that you will find on a specialized shop.

This device can be connected directly to an Ethernet network using a YoctoHub-Ethernet, or to a WiFi network using a YoctoHub-Wireless-g.

Yocto-Thermocouple Yocto-Thermocouple Yocto-Thermocouple

USB cables and enclosure to be ordered separately.

CHF 48.60

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Manufacturer Product NumberTHRMCPL1
Product nameYocto-Thermocouple
SensorType K,E,J,N,R,S,T
USB connectormicro-B
Refresh rate5Hz
Accuracy1░C 1%
Sensitivity0.2░C 0.3%
Max. temperature1768░C
Min temperature-200░C
Supported Operating SystemsWindows, Linux (Intel + ARM), Mac OS X, Android
Driversno driver needed
API / SDK / Libraries (USB+TCP)C++, Objective-C, C#, VB .NET, Delphi, Python, Java/Android
API / SDK / Libraries (TCP only)Javascript, Node.js, PHP, Java
Suggested enclosureYoctoBox-Short-Thick-Black
Cables and enclosuresavailable separately
Made inSwitzerland

Related articles and application examples

 Cook and Hold with Raspberry Pi (video)  Comparison of temperature sensors  Turn your Raspberry Pi into a network multimeter  What happens inside the fridge?  Viewing temperature flows 

Accessories and related products

YoctoBox-Short-Thick-Black, Enclosure for Yoctopuce device (short, thick, black)YoctoBox-Short-Thick-Transp, Enclosure for Yoctopuce device (short, thick, transp)Micro-USB-Hub, Micro USB hub with solder pads, for DIY useFix-2.5mm, screws and spacersUSB-A-MicroB-30, A to micro-B USB data cable, 30cmFlat-Cable-Solid100, Ribbon cable 1.27mm pitch, tinned solid copper, 100cm


User manual (HTML)
User manual (PDF)
3D file (STEP)
Last Firmware20933 (07/24/2015)
Library for Javascript21486 (09/11/2015)
Library for PHP21486 (09/11/2015)
Library for Objective C21486 (09/11/2015)
Library for C++21619 (09/25/2015)
Library for C#21486 (09/11/2015)
Library for VisualBasic .NET21486 (09/11/2015)
Library for Delphi21486 (09/11/2015)
Library for Python21486 (09/11/2015)
Library for Java21486 (09/11/2015)
Library for Android21486 (09/11/2015)
Library for Command line21486 (09/11/2015)
Virtual Hub for Windows21486 (09/11/2015)
Virtual Hub for Linux, Intel + ARM21486 (09/11/2015)
Virtual Hub for Mac-OS-X21486 (09/11/2015)

Add a comment 9 comments

1 - edward_valarm Wednesday,may 07,2014 23H28

The Valarm Pro Android app supports up to 4 Yocto-Thermocouple sensors at the same time so you can alert and upload data to the Valarm Tools Cloud with up to 8 channels of temperature! http://www.valarm.net/blog/new-valarm-pro-app-version-1-3-0/

2 - pam Friday,may 30,2014 17H16

Hi I'm wondering how long the thermocouple cables can be? I have a space that I have about 100 feet distance to travel. Also what gauge wire would you recommend?

3 - martinm (Yocto-Team)Friday,may 30,2014 17H44

@pam 20 AWG or thicker wire should be fine as long as you are free of electromagnetic interferences.

4 - petero Sunday,february 01,2015 11H16

Hello. Can this thermacouple (or another) sensor be used to accurately measure soil temperature vs. ambient air temp? What precision would it have?

5 - martinm (Yocto-Team)Sunday,february 01,2015 13H06

@petero : if you're interested in precision, you should choose a Yocto-PT100:

6 - maturin Tuesday,april 21,2015 21H44


Im interested in displaying temperature probably not data logging or usb. Can I add a LCD to display current temperature?

7 - martinm (Yocto-Team)Wednesday,april 22,2015 5H53

@maturin You could use a mini-pc such as a Raspberry PI to drive a Yocto-Thermo-couple and a Yocto-Display such as described here: http://www.yoctopuce.com/EN/article/turn-your-raspberry-pi-into-a-network-multimeter but honnestly, if you are not interested in connectivity, you should find yourself a regular handheld thermometer.

8 - shelendra Saturday,may 16,2015 6H37

You have provide great examples , why don't you provide an app like valarm.. it will be helpful . i want to save the data on smartphone and than later upload it to xively or in real time ... like i m able to do using pi or pc .
Please consider this . i tried valarm and i don't think it real worth money

9 - martinm (Yocto-Team)Monday,may 18,2015 19H14

@shelendra: we have no plan for any kind of turn-key software solution. Here at Yoctopuce, the plan is to focus on the hardware and make it easy to integrate. That way our customers only have to care about the software and can write their own solution suited to their need.

Yoctopuce, get your stuff connected.