It's hard to see what's in the air around us—unless you've got a handy portable air quality monitor like Arnov Sharma. This maker uses our favorite microcontroller, the Raspberry Pi Pico 2, to power his custom handheld, making it possible to see what exactly you're breathing in and how much of it is around. This portable air quality meter is an open-source project with full build details available at Hackster.
Sharma says the meter is built around an MQ135 air quality sensor. This module works with various controllers and can operate efficiently using a Pico 2. The Pico is also connected to an OLED display to get visual output. This screen has a custom interface that displays specific particle levels in real time.
