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In this project I've created a co2 sesor (mh-z19) with connection to a mqtt broker, so you cann send the co2 data to a mqtt broker.

I've used the esp8266 12e version.

Folder structure:firmware - all files, that you do need to flash your esp8266 12epcb - board schema, pdfs. Imprtant: for the board you need a usb-connection board (show image board_top.jpg)3d-models - 3d models for 3d printer, so you can print a case for pcb.