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Portable Particulate​ Matter Monitor

There are two ways for measuring air quality. The first focuses on the presence of specific gases like CO2, CO, NO2, NOx, O3, SO2 and VOC. The second is based on concentration of particulate matter, or dust in plain English.

​This project monitors the concentration of PM10, or particle matter of less than 10 μm, and displays a colour accordingly.
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Hardware

The hardware combines ready-to-use Grove devices with the compact Xiao board:
  • Xiao board
  • Grove shield for Xiao
  • Grove PM2.5 Laser Dust sensor
  • Grove RGB LED
  • a LiPo battery

The PM2.5 laser dust sensor measures the concentration for particulate matter of 10 μm, 2.5 μm and 1.0 μm. Values are in µg/m³.
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Software

The project uses the available libraries for the sensor and the LED:
  • Grove PM2.5 Dust Sensor library
  • Grove RGB LED library​​

​
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The colour of the LED is set according to PM10 concentration in µg/m³. It is based on the European index Citeair.
  • Blue: less than 14 µg/m³, excellent
  • Green: from 15 to 28 µg/m³, good
  • Yellow: from 28 to 35 µg/m³, fair
  • Red: from 35 to 50 µg/m³, poor
  • White: more than 50 µg/m³, hazardous

Although the sensor is capable of reading PM2.5 and PM1.0 , I haven't found the corresponding tables to define the air quality.
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Conclusion 

The vast assortment and the ease of use make the Grove system a great choice for projects.
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Links

  • Xiao board
  • Grove shield for Xiao
  • Grove PM2.5 Laser Dust sensor
  • Grove RGB LED
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Posted: 18 Jan 2021
​Updated:
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