An inexpensive domestic 'Air Quality Monitor' ( abbreviated AQM ) has been modified with additional sensor support, display module and 32-bit micro-controller.
The original AQM, ( made in China ), uses a Cubic PM1006 Particulate Matter sensor to determine the PMx ( x = microns ) particulate matter concentration in the air and changes the colour ( green, yellow or red ) of an illuminated indicator accordingly. This feature has been retained in the SpacerLabs modified versions.
The modified versions measure PM1, PM2.5 & PM10 and, optionally, have either a CCS811 sensor or AHT20 sensor also fitted to provide TVOC & CO2 or temperature & humidity data as well. The measurement data are displayed on a blue or white 128x32 pixel OLED display. Firmware which controls the sensors and the display is uploaded to the micro-controller via a micro USB connector.
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| AQM version PM1006/CCS811 |
AQM version PM1006/AHT20 will be deployed in the kitchen where airborne particulate matter ( smoke ) and high humidity caused by cooking can be monitored.
AQM version PM1006/CCS811 is suitable for a workshop environment where CO2 & TVOC could be present, in addition to particulate matter.
A SpacerLabs App, called "Air_Quality", has been designed, so that the PM1, PM2.5 & PM10 measurements can be viewed on a mobile device, using BluetoothⓇ communication. The PM2.5 concentration value will change colour in the same way as the
illuminated visual indicator on the original domestic AQM.
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| SpacerLabs 'Air_Quality' App |
The AQM can be powered by a USB charger connected by a cable with a USB-C plug.
The micro-controller also has built-in wifi as well as BluetoothⓇ. This opens up the future possibility of integrating the multi-sensor AQM into a 'smart home' network.
TVOC = Total Volatile Organic Compounds ( paint, solvents etc ).
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