The Yocto-CO2 device lets you measure the quantity of carbon dioxide (CO2) in ambient air via an USB connection, as well as record it on its internal flash for later retrieval when connected again by USB.

This device is ideal to precisely monitor the air quality in residential, commercial and industrial spaces, as well as potentially dusty air ducts used in HVAC (Heating Ventilation and Air Conditioning) systems. The sensor used in this device uses non-dispersive infra-red absorption (NDIR), and requires no maintenance. It provide precise measurements already within the first minute after power on.

The expected CO2 concentration in fresh air varies between 360 and 390 ppm depending on the location. Industry consensus standard rate maximal admissible CO2 between 1'000 and 2'500 ppm in ventilated buildings. Around 10'000 ppm, some people feel dizziness. The standard version of this sensor is capable to measure up to 10'000 ppm (vol), or 1%.

The same device can be built with a 30'000 ppm sensor (3%) on demand, at a higher price but without minimal quantity. The 300'000 version (30%), based on SenseAir K-33 sensor, can be built on demand for orders of 100 pieces or more.

This product is no more available, it has been replaced by the Yocto-CO2-V2 which features better sensors.

This device can be connected directly to an Ethernet network using a YoctoHub-Ethernet, to a WiFi network using a YoctoHub-Wireless-n and to a GSM network using a YoctoHub-GSM.

Yocto-CO2 Yocto-CO2 Yocto-CO2

USB cables and enclosures to be ordered separately.

This product is not available anymore. It has been replaced by the Yocto-CO2-V2


Product ID:YCO2MK01
Product name:Yocto-CO2
Replacement product:Yocto-CO2-V2
USB connector:micro-B
Sensor:SenseAir K-30
Refresh rate:1Hz
Measuring range:0-10000ppm (vol)
Accuracy:30 ppm 5%
Sensitivity:20 ppm 1%
Protection class, according to IEC 61140:class III
Normal operating temperature:5...40°C
Extended operating temperature1:0...50°C
Supported Operating Systems:Windows (PC + IoT), Linux (Intel + ARM), macOS, Android
Drivers:Driverless, no driver needed
API / SDK / Libraries:C++ Obj-C C# VB.NET UWP Delphi Python Java Android LabVIEW
API / SDK / Libraries (TCP only):Javascript Node.js PHP
RoHS compliance:RoHS III (2011/65/UE+2015/863)
Suggested enclosure:YoctoBox-CO2-Black
Harmonized tariff code:9032.9000
Cables and enclosures:available separately
Made in:Switzerland

1 The extended temperature range is defined based on components specifications and has been tested during a limited duration (1h). When using the device in harsh environments for a long period of time, we strongly advise to run extensive tests before going to production.

Accessories and related products

USB-A-MicroB-50, USB 2.0 type A to Micro-B data cable, 50 cm

Related articles and application examples


User manual (HTML)
User manual (PDF)
Product brief
3D file (STEP)
RoHS certificate
Most recent firmware51180 (09/30/2022)
Programming libraries61813 (07/05/2024)
Command line API61813 (07/05/2024)
VirtualHub application61813 (07/05/2024)

Add a comment One comment

1 - edward_valarm Friday,march 22,2013 23H33

Android™ app Valarm Pro v1.2 now includes support for the Yocto-CO2 sensor! Monitoring CO2, whether you’re using it for agricultural or ornamental purposes, or producing it due to industrial or food production activities, or simply living and working in enclosed spaces of any kind – can be critical for human health, productivity, and creativity. With Valarm you can monitor CO2 in real-time, record data to visualize trends, and trigger alerts at configurable levels.

Check out http://www.valarm.net/blog/valarm-pro-update-monitors-co2-and-vocs/ for additional information.


Yoctopuce, get your stuff connected.