I’ve had a low cost carbon dioxide (CO2) sensor sitting on my desk for over a year! I thought why not get this thing recording, as I have already done a load of work sending data to MQTT feeds. The CO2 sensor I purchased was the MH-Z14A. The datasheet is available here. I think it … more
I have built an environmental monitoring unit for my workshop. This measures: Air Temperature, Humidity & Pressure PM2.5 and PM10 Particulate values Radiation levels It shows the data on a small OLED screen. There is a large LED RGB display which changes colour if data goes above warning levels. This unit sends data to AdafruitIO via MQTT messages. This … more