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I turned a Raspberry Pi into a speed tracker, and now I know exactly when my ISP is lying

A few speed tests over a week revealed an unexpected problem.
PC World

How to build your own air quality meter with a Raspberry Pi and CO2 sensor

PCWorld explains how to create an affordable CO2 air quality monitor using a Raspberry Pi and MH-Z19C sensor for under $40. This DIY project helps monitor indoor air quality since high CO2 levels ...