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A Captor is a device based on an Arduino Yun.It samples the concentration of ozone in the air by using several MOS (Metal Oxide Semiconductor) sensors to improve the accuracy, and sends the data to a server using either a wired (Ethernet) or wireless(WiFi) connection. This document describes how "Captor v1" is currently designed. Some units have been deployed for testing. Based on this testing, characteristics may change in future iterations "captor v2". The main goal is to design a device that is both affordable and accurate, and that it can be easily built by the DIY community. It uses the MiCS-2614 compact O3 MOS sensors, to sample the Ozone concentration in the air. As the data accuracy of these sensors is not good enough and these are cheap 10$, we use 5 of them plus a humidity and temperature sensor and statistical learning techniques to improve the accuracy. The Captor sends the raw Ozone data, as it is obtained from the MiCS-2614 sensors (resistance values in Ohms) to our online platform, where it is processed to obtain the final ozone concentration in ug/m^3 or ppb.


polycarbonate box: 16 x 9 x 9 cm
external sensor tubes: 15 cm

Highlighted parts:

Used for its construction:
1 x Arduino Yun (Open Hardware, designed/sold from Italy)
5 x MiCS-2614 compact O3 MOS sensor (built by SGX sensortech, Switzerland)

Data connection: Ethernet or WiFi

The captor v1 needs Internet connection, that can be either Ethernet or WiFi. e.g: It can be used directly connected to a home wired ADSL router, a Wireless Acces Point or a 3G router sharing the connection.

Power Supply: microUSB or PoE

Being based on the Arduino Yun with PoE, it can be powered from a common microUSB 5V 1A or from PoE (Power over Ethernet) 48V.