Low-Cost DIY Solar Irradiance Sensor

This post covers the design of a low-cost solar irradiance sensor. This type of sensor is called a ‘pyranometer‘, (from the Greek “pyr” (fire) and “ano” (sky/heaven)) and there are a wide range of units available, typically very expensive, but accurate! I wanted to design a lower cost unit which can be easily interfaced with … more

CO2 Monitor

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 did a … more

Workshop Environment Monitor

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