CO2 meter
thingiverse
The DIY CO2 meter and grapher for home and office use. Features: - display current CO2 level, temperature and humidity - display historical graph of CO2 level for last 30 minutes - switch to large display of CO2 level - alarm when CO2 exceeds limit of 1000 ppm - self calibration with countdown display Electronics inside: - Arduino nano - 0.96" OLED display - MQ135 sensor - DHT11 sensor - 6x6x4.3mm button [Arduino firmware and schematics at my github](https://github.com/Aleksandr-ru/co2meter) Assembly instructions at my website [in Russian](https://aleksandr.ru/blog/domashniy_co2_metr) or [translated to English](https://aleksandr-ru.translate.goog/blog/domashniy_co2_metr?_x_tr_sl=ru&_x_tr_tl=en&_x_tr_hl=ru&_x_tr_pto=wapp).
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