Monitor air quality using a Raspberry Pi, a cheap sensor, and an inexpensive screen. — Stephan Tetzel About a year ago, I wrote an article on how to measure air quality using a Raspberry Pi and a cheap sensor. We have been using this project at school and privately for the past few years. However, … Read more
Gas Sensor (MQ-135) The working principle of the MQ135 gas sensor is based on the adsorption of target gases by semiconductor gas-sensitive materials, which changes the resistance value. The sensor contains a sensitive element and a heater, with the sensitive element typically made of metal oxide semiconductor materials, such as tin dioxide (SnO2). When there … Read more
Click the blue words to follow us 01 Determine Welding Process There are many grades of stainless steel. According to the alloy composition, it can be divided into chromium-based stainless steel and chromium-nickel stainless steel. According to the metal structure of stainless steel, it can be divided into austenite type, ferrite type, martensite type, etc. … Read more
The issue of air quality has become a global topic. Outdoors, people can assess the severity of pollution by observing the orange-yellow sky and reduced visibility. This is when we know to open air quality detection software to see if we need to wear masks, turn on air purifiers, or let our children play outside. … Read more
Last week’s article discussed how to control LEGO with Arduino through Bricktronics, building a bridge of communication between Arduino and LEGO. Through this communication mechanism, we can integrate Arduino’s rich peripheral detectors into our application system, giving wings to our creativity. When writing last week’s article, it was during a haze period, but the “unruly … Read more
Build an air quality detector using two simple hardware devices and a few lines of code. — Stephan Tetzel Useful original links Please visit the “Original Link” at the end for clickable links, full-size original images, and related articles. Acknowledgements Translated from | https://opensource.com/article/18/3/how-measure-particulate-matter-raspberry-pi | Author | Stephan Tetzel | Translator | Hank Chow (HankChow) … Read more