MH-Z19 CO2 sensor reader, logger and visualiser


Reads data from UART(serial)-connected MH-Z19 (or MH-Z14) sensor using python 3.
If you dare to install nodejs you can visualise the logged data (using html and plotly.js library).

Repository: sammcj/CO2-Logger
Usage
Note this post is from 2016, in 2021 I replaced my custom Co2 loggers with an Aranet4. While very expensive, is and excellent off-the-shelf solution, with many features.
Connection
Sensor can be queried using 3.3v UART at 9600 bps. Sensor main feed voltage is 5v.

Sam McLeod

A Python 3 tool for reading, logging, and visualizing CO2 data from the MH-Z19 (or MH-Z14) NDIR sensor over UART/serial. Covers wiring, connection via USB-UART adapter, command-line usage, raw sensor commands, calibration warnings, and data visualization using plotly.js. Compatible with Raspberry Pi, ESP8266, and Arduino. The author later replaced this DIY setup with an Aranet4 commercial device in 2021.

MH-Z19 CO2 sensor reader, logger and visualiser #