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This repository has the code that helps you to build DIY CO2 measuring devices and connect them to your smartphone. The measurements can be an aid for Covid-19 prevention. The idea is that if there is a lot of exhaled CO2 in the air, there are also a lot of aerosols in the air. These smallest particles, to which Sars-CoV-2 viruses from the respiratory tract attach themselves, can float in the room air and can spread over several meters. A high concentration of aerosols increases the risk for everyone else in the room to become infected.

You can find more information on how to use the files in the following tutorials:

• M5Stack: Fresh air checker helps you to stay safe from #COVID-19
• Nginx: Docker, Flask and Let's Encrypt (SSL)
• M5Stack: Widgets on your Smartphone help to stay safe from #COVID-19
• iOS Scriptable Widget

Fig. 1: CO2 reporting widgets on Android and iOS

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