Yocto-thermocouple wireless-g

Yocto-Thermocouple Wireless-g


Combine a Yocto-Thermocouple with a YoctoHub-Wireless-g to get an autonomous appliance with built-in network connectivity:



The Yocto-Thermocouple device is a USB temperature sensor. It will let you perform instant temperature measurements on two thermocouple inputs, as well as as record the measures on its internal flash for later retrieval when connected again. 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.

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The YoctoHub-Wireless-g is a wireless-enabled module that can host three Yoctopuce modules to access them remotely through a Wifi network (802.11g). It can be powered either by a USB Micro-B cable and a regular phone charger, or a 5V battery pack.

Three Yoctopuce modules can be connected directly, one of which can be fixed directly on the YoctoHub-Wireless-g and connected using a Board2Board-127 connector. More devices can be connected, thanks to the YoctoHub-Shield extension. The YoctoHub-Wireless-g can power Yoctopuce devices up to 2A.

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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
Cables and enclosuresavailable separately
Made inSwitzerland

Add a comment 23 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

22 - philbot999 Wednesday,may 10,2017 12H14

I bought this thermocouple and I want to use it with my Raspberry Pi Zero W using the latest ( April 2017 ) Raspbian Release. I understand that the newest Raspbian does not support these devices, but the older ( March 2016 ) Raspbian release does. I have everything configured on my newer Raspbian and do not want to go back to an older release. Is there a workaround so that I can use this thermocouple with my Raspberry Pi? Thanks.

23 - seb (Yocto-Team)Wednesday,may 10,2017 12H29

@philbot999: Unfortunately, we have no workaround.

We have done lots of tests with an USB analyzer and we have found that time to time the Raspberry Pi send corrupted USB packets. This problem occur only with Pi Zero and latests Rasbpian. The same Image with the sames device work perfectly on a Raspberry Pi 2 or 3.

We will submit a bug report to the Raspbian team and try to help them to fix this issue.

Yoctopuce, get your stuff connected.