I have printed the case in PLA with my Prusa i3 x. The MQ135 (air-quality sensor) is controlled by an Arduino Nano and connected with a HC-06 bluetooth module to interact with an Android smartphone (and see the ppm level). The magnets hold the face to the case. A yellow led will switch on when the sensor detects 1000 ppm and a red led will switch on when it detects 1500 ppm. I have decided to construct this sensor in particular for schools. Infact, I have noticed that the level of attention decreases with a high CO2 level.
I hope you can find this sensor useful!
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