Fine dust sensor

You should care about indoor air

In 90% of cases the air in our homes is stuffy and dusty. 
This can cause breathing problems, especially for people with allergies.

See the invisible

V‌arious activiteit, like cooking, can have a large impact on air quality. 


T‌he sensor uses a laser to accurately count particles. 

T‌rigger an air filter 

You don't have to live in China to buy an air filter anymore. Turn it on automatically when things get stuffy.

Measure outdoors

A growing community of people is exploring how these sensors can be used to support research.

  • Fine dust sensor

    As imagined by Dinie Besems

    See more

Building the sensor

Approximate build time: between 5 and 15 minutes.

Connect the dust sensor

Pins 3 and 4 connect to the Transmit (TX) and Receive (RX) pins of the sensor.

Connect the OLED screen

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

Select the Candle Manager from the menu, and follow the steps. It will help you upload the code to your new creation.

Add your new device

Visit the Candle 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.


Explore how your sensor measures up to scientific data.

Shopping list

This shopping list on Aliexpress will get you everything in one go.

Buy from Aliexpress


Small OLED screen
Jan 21, 2019

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

Dust sensor
Aug 10, 2018

Uses a laser to detect very fine dust particles.

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.