The trio of sensors is completed by the Sensirion SGP40, which BMF System Parts has been made available for the gadget project. The SGP40 is a digital VOC sensor (volatile organic compounds) that is easy to integrate into air treatment equipment and air quality monitors, such as the Environmental Monitor. The component is a complete sensor system on one chip and features a digital I²C interface, a temperature-controlled micro hotplate and a humidity-compensated indoor air quality signal. With this total solution, the VOC observations can be made immediately available for analysis, as is done in the Environmental Monitor. And with its low power consumption, this sensor is ideally suited for battery-powered applications.
How is it measured?
To limit energy consumption, the Environment Monitor measures in intervals (so not constantly). Depending on the power consumption and the energy supply, the interval can be made larger or smaller. And with a mains connection, it is even possible to measure continuously.
In addition, the positioning of the aforementioned sensors is crucial for an accurate measurement. The design must take into account various factors that can influence the perception of a sensor. How we have dealt with these challenges can be read soon in an article about the design of the housing.
Sending measurement results
Carrying out a measurement generates measurement data. The generated measurement data is processed via the processor and converted into a usable observation. The data is sent via the WiFi module (ESP32-C3-WROOM-02U-N4) to the platform to which the Environmental Monitor is connected. To strengthen the signal strength of the monitor, the FBTS35024-SM-ST 2.4Ghz Antenna was used. The door AVE Added Value Electronics sponsored antenna is an accessible and easy-to-use component with an SMA connection. The trade fair visitor connects the antenna to the Environmental Monitor himself, as the antenna is connected to the PCB via an adapter plug.
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