🔘Particulate Matter ㏘, PM2.5, data can now be uploaded 🖧 to the Ubidots cloud ☁ from the Air Quality Monitor ( AQM ); see 15.03.2023. The Ubidots Ů platform provides visualisation / analysis of data from IoT sensors, also generating events, alerts, actions etc if required. We are already using this platform in conjunction with the Greenhouse Gas Monitoring system ( see 28.07.2022 ) and a soil moisture meter. On this occasion, with the AQM, Node-Red is being used for alerts⏰.Two new widgets to display the PM2.5 concentration value have been added to an existing SpacerLabs Ubidots dashboard. The colours used for the air-quality levels ( good, OK, poor ) on the gauge widget match those used on the coloured LED indicator on the front of the AQM.
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| Part of the dashboard showing the new widgets for PM2.5 |
Using the Node-Red 🟥 application, function 'nodes' are linked by connecting inputs to outputs and on-line services to create a 'flow' to perform task(s) using a browser based workspace. We have used it previously with the UVRM ( see 23.03.2023 ) and a soil moisture meter. The AQM flow ( image below ) starts by subscribing to the AQM PM2.5 data on Ubidots cloud using MQTT ( blue node ) and ends by triggering an email 📧 to be sent when the PM2.5 level exceeds 85 ug/m3; classified as level 'high' and air 🜁 quality 'poor'.
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| Node-Red 'flow' to trigger an email warning of poor air quality |
It can be seen under the 'Debug' tab that an email 📧is indeed sent when PM2.5 >85; otherwise only the value ( if changed ) is reported. The email topic reads "SpacerLabs AQM - PM2.5 Alert " and the message reads "The SpacerLabs AQM has measured a PM2.5 level >85 (High) Air-Quality category - Poor. (Timestamp)". Even though the AQM may not be visible, an immediate audible notification is given by a smart phone when the email is received. 🔲
PM2.5 = Particulate Matter size 2.5 micron
MQTT = Message Queued Telemetry Transport
IoT = Internet of Things
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