Carbon sensor

Breathe better

High levels of Co2 can influence how you feel. High levels of CO.. are deadly.

Wake up refreshed

If your bedroom has a high CO2 levels at night, this may cause  headaches. 

M‌ake it smart 

Automatically open a window when CO2 levels get too high.

Works without any connection

It shows its measurements on the built-in screen.

Can generate fake data

Generate data that looks like levels are holding steady.

Why can this sensor generate fake data?

The CO2 levels in your home go up if more people are present. This means the CO2 sensor can also be used as a people counter. 

Young adults should be able to bring over friends, or a date, without this being immediately readable to the parents. We believe this is vital to healthy social development.

‌ Sometimes a smart home can measure too much.

Learn more
  • CO2 sensor

    Created by artist and jeweler Dinie Besems

Creating the sensor

A‌proximate build and install time: 10 to 20 minutes.

Connect the CO2 sensor

Connect its TX (Transmit) pin to signal pin 5, and connect its RX (Receive) pin to signal pin 6. Its Vin pin can be connected to any VCC pin. It's GND pin can be connected to any GND pin.

Connect the OLED screen

Connect SDA (Signal Data) to signal pin A4 and SCK (Signal Clock) to signal pin A5.

Plug in the Arduino

Plug in the RF-Nano Arduino

Plug the RF-Nano into its socket. The USB connector should be on the outside of the main board.

Open the Candle Manager

Visit the controller, and click on the "Create Candle" link to open the Candle manager. Follow the step by step guide. It will help you upload the code to your new creation.

Add your new device

Visit the Mozilla Gateway controller and on the things page press the (+) icon. Your new creation should be available. Optionally, select which of its properties you'd like to have in the spotlight. Click on "save" to complete the proces.

Shopping list

This shoppinglist on Aliexpress will get you everything in one go.
Co2 sensor module
Mar 22, 2019

This module uses infrared to measure Co2 levels. This allows it to work accurately for a very long time.

Small OLED screen
Jan 21, 2019

This small screen is built with OLED technology. It uses very little power.

RF-Nano Arduino
Aug 10, 2018

The RF-Nano is an Arduino Nano with built-in wireless connectivity. It's the brain of all Candle devices.

Dupont wire
Aug 09, 2018

These wires allow you to easily connect the main board to sensors and actuators. They snugly fit over the pins. No soldering…

Expansion board
Aug 06, 2018

This expansion board makes it easy to connect everything by just plugging in wires.