https://smcleod.net/tags/co2/ Recent content in Co2 on smcleod.net https://smcleod.net/logo-painted-350.svg https://smcleod.net/logo-painted-350.svg Hugo -- 0.152.2 en Fri, 10 Jul 2026 12:03:26 +1000 https://smcleod.net/2016/12/mh-z19-co2-sensor-reader-logger-and-visualiser/ Wed, 21 Dec 2016 16:37:38 +1100 https://smcleod.net/2016/12/mh-z19-co2-sensor-reader-logger-and-visualiser/ <!-- markdownlint-disable MD025 --> <h1 id="mh-z19-co2-sensor-reader-logger-and-visualiser">MH-Z19 CO2 sensor reader, logger and visualiser</h1> <p><img alt="plot" loading="lazy" src="https://user-images.githubusercontent.com/862951/52826593-a98a5400-3115-11e9-868a-72a763b6d587.jpg"></p> <ul> <li>Reads data from UART(serial)-connected MH-Z19 (or MH-Z14) sensor using python 3.</li> <li>If you dare to install nodejs you can visualise the logged data (using html and plotly.js library).</li> </ul> <p>Repository: <a href="https://github.com/sammcj/CO2-Logger">sammcj/CO2-Logger</a></p> <h2 id="usage">Usage</h2> <p><em>Note this post is from 2016, in 2021 I replaced my custom Co2 loggers with an <a href="https://aranet.com/products/aranet4/">Aranet4</a>. While very expensive, is and excellent off-the-shelf solution, with many features.</em></p> <h3 id="connection">Connection</h3> <p>Sensor can be queried using 3.3v UART at 9600 bps. Sensor main feed voltage is 5v.</p>