3/4/2023 0 Comments Arduino csv coolterm![]() ![]() An overview of the set-up is shown in Fig. The CO 2-dongle makes use of a microcontroller, which is connected to the PC via USB. ![]() Besides its straight use as a CO 2 monitoring device, the design reported herein may also be taken as a starting point if a CO 2 sensor is to be integrated into a more complex monitoring or control system. For the CO 2-gadget from Sensirion this is achieved with an app running on a smartphone which connects to the device via Bluetooth, while the CO 2-dongle sends its results to a PC, which also provides the power. However, the two devices differ in the way the measurements are read out. Sensirion, the manufacturer of the CO 2-sensor used, has recently released a device, for CO 2 measurements only, under the designation of CO 2-gadget, which is also compact and powered from a USB supply. As the CO 2-sensor device employed also incorporates temperature and humidity sensors this information is also available with the CO 2-dongle. Furthermore, the measurements can be recorded on the computer for later reference and processing of the data. The computer screen also allows to show detailed information, i.e. The device therefore does not require its own power supply and display, and can therefore be kept much smaller and lighter than a stand alone unit. This is a significant simplification as the notebook computer can then provide power to the measuring device and can serve for the read-out of the measurements, while the computer can still also be used for the normal tasks. As notebook computers are frequently carried by their users and brought to such settings anyway the device was designed as an attachment. The device introduced herein is intended as a highly compact personal monitor which can be brought to indoor gatherings such as staff meetings, classes at schools or lectures at universities. For this reason they are relatively large and not designed for mobile use. However, these instruments are usually stationary, mostly need to be plugged into a mains power supply and feature a screen for direct display of the measurements. The measurement of CO 2 levels may serve as a monitor for the quality of ventilation.Ĭommercial devices for consumers to measure CO 2 concentrations in air are readily available, often as part of instruments which also show other parameters such as temperature and humidity. CO 2 levels are frequently measured as a general indicator for the effectiveness of ventilation, and indeed correlate with the risk of airborne infection, including the SARS-CoV-2 coronavirus. A lack of ventilation can also lead to an accumulation of airborne pathogens, and in light of the COVID-19 pandemic the World Health Organisation (WHO) therefore recommends rigorous standards of ventilation especially in classrooms. Relatively modest build-ups to 1000 ppm are already considered to lead to an impairment of human cognition, and higher levels can lead to drowsiness. This was facilitated by the choice of Forth as the programming framework for the microcontroller.Ĭarbon dioxide (CO 2) is released by humans through respiration and therefore when people are present in enclosed environments its concentration in air is found to increase from the ambient level of ca. A MSP430FR2433 microcontroller on the board controls the sensor and establishes the communication to the software application on the computer. A graphical user interface on the PC programmed in Python allows easy interaction with the user. The device utilizes a novel compact CO 2 sensor which has only become available commercially recently, and is based on the photoacoustic measuring principle. ![]() This is of particular interest when airborne pathogens might be present such as during the COVID-19 pandemic. As the level of CO 2 rises indoors when people are present and the air is not exchanged adequately the device can be employed as a personal device for monitoring indoor air quality. The measurements can be viewed on the computer display where they also can be plotted as a graph to recognize trends. It is plugged into the universal serial bus (USB) port of a personal computer (PC) which serves to provide power and for downloading the measurements. ![]() The compact pocketable CO 2-measuring device is built on a small printed circuit board (PCB) with the dimensions of ca. ![]()
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