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MH-Z19C CO2 sensor connected to a raspberry pi 3. CO2 and temperature values are shown on the SH1106 128x64 1,3" OLED display.
To start the program run python3 co2.py
Connection schematics
Fritzing file contains the schematics pictured below.
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CO2 sensor (MH-Z19B) and an OLED display on Raspberry Pi 3