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 -75C and 260C (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, to a WiFi network using a YoctoHub-Wireless-g, it can even be connected to a GSM network thanks to the YoctoHub-GSM.

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
Accuracy1C 1%
Sensitivity0.2C 0.3%
Max. temperature1768C
Min temperature-200C
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  The  Yocto-Thermocouple and ground loops 

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 Firmware24473 (05/23/2016)
Library for Javascript26849 (03/20/2017)
Library for PHP26849 (03/20/2017)
Library for Objective C26849 (03/20/2017)
Library for C++26849 (03/20/2017)
Library for C#26849 (03/20/2017)
Library for VisualBasic .NET26849 (03/20/2017)
Library for Delphi26849 (03/20/2017)
Library for Python26849 (03/20/2017)
Library for Java26849 (03/20/2017)
Library for Android26849 (03/20/2017)
Library for Command line26849 (03/20/2017)
Virtual Hub for Windows26841 (03/17/2017)
Virtual Hub for Linux, Intel + ARM26841 (03/17/2017)
Virtual Hub for Mac-OS-X26841 (03/17/2017)

Add a comment 21 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.

10 - eipa Thursday,january 07,2016 22H51

I want to use this device for cooking so: are these thermocouples water-resistant or should I start by looking for suitable thermocouples?

11 - mvuilleu (Yocto-Team)Friday,january 08,2016 7H54

@eipa Thermocouple wires are water resistant, but personally I don't like to put use any type of plastics for cooking, so I rather use mineral insulated thermocouples for that type of application. Note that if you are cooking on an old electric stove (which is likely to be grounded), your measures might be incorrect due to ground currents. This is also solved by using a mineral insulated thermocouple.

12 - astroboy Sunday,march 13,2016 23H47

Hi there. I have the thermocouples set up and am graphing data on my phone using your Yocto-graph Android app. Is there a way I can easily download the values that make up the graph so I can use the data elsewhere?

13 - seb (Yocto-Team)Monday,march 14,2016 8H02

@astroboy: This demo application cannot export data. If you want to export measures of the datalogger the easiest way is to use our command line library. Plug your Yocto-Thermocouple to a computer and use the command line YTemperature to export all data in csv format:

YTemperature.exe --csv all get_recordedData 0 0

14 - el toro Wednesday,may 04,2016 13H15

what is the communication protocol of this device?

15 - martinm (Yocto-Team)Wednesday,may 04,2016 14H10

@ el toro: same as all yocto-devices: HID vendor specific

16 - gillio Wednesday,august 10,2016 6H17

It is possible to connect (RT) Standard Bayonet Type (PT-100 sensor, 3 wires) to yocto-thermocouple?

17 - martinm (Yocto-Team)Wednesday,august 10,2016 6H24

@gillio: No, thermoucouples and PT100 are two different technologies. But you can use a Yocto-PT100 to read your 3 wires PT100 :-)

18 - swa72 Monday,january 16,2017 12H59

Can someone recommend two probes that

- avoid possbile grounding problems (i.e. are mineral insulated thermocouples)
- work with Yocto-thermocouple
- measure air temp in an oven (like http://www.thermoworks.com/TX-1003X-AP)
- measure meat temp (like http://www.thermoworks.com/TX-1001X-OP)

and can be easily bought in EU?

I'd like to get an idea for the probes first before buying the Yocto-thermocouple ;-)

Best, Stefan.

19 - martinm (Yocto-Team)Monday,january 16,2017 13H45

Hi Stefan

Have a look at www.labfacility.com and www.tcdirect.com

20 - swa72 Monday,january 16,2017 15H21

Thanks for the quick answer. Can I use the default probes and its connecting cables (PFA isolated) in water and hot air? Air temp < 250C and water temp less than 100C.

21 - martinm (Yocto-Team)Monday,january 16,2017 16H12

@swa72: yes, but since the thermocouple wires provided with the Yocto-Thermocouple are *not* mineraly insulated, you'll have to be extra-careful with water and make sure the container is properly isolated.
More details here: www.yoctopuce.com/EN/article/the-yocto-thermocouple-and-ground-loops

Yoctopuce, get your stuff connected.