Neko, a DIY CO2 detector to better ventilate

a "Do It Yourself" CO2 detector
to better ventilate

The project is supported by la fabrique,
the fab-lab of CentraleSupélec, a french engineering school of Paris-Saclay University.

More informations (in french) on :

Last update : 02-01-2021 | mail :

What is Neko ?

Neko is a detector that measures the CO2 level in a room and alerts on 4 levels:
  • <430 PPM: this is the reference level corresponding to an outdoor environment.
  • <800 PPM : air considered as quality air
  • between 800 and 1000 PPM : the room must be aerated
  • between 1000 and 1500 PPM: poor quality, the room must be aerated
  • >1500 PPM: Warning! very bad quality of the air in the room

By following the instructions given by Neko, you will promote the ventilation of a room and thus reduce the risk of aerosolidation contamination by the COVID19 virus.

How to make Neko ?

Neko can be manufactured in a fab-lab or at a private home with some facilities (3D printer, ...). It does not require the manufacture of a printed circuit board.

You can download :

Neko uses a Senseair S8 CO2 sensor which seems to us well adapted for this use. It is reliable, simple to implement and inexpensive (20-30 €).

How to improve Neko ?

You can contribute to the project by sending your remarks, comments or suggestions on the email