A reliable indicator of the air quality in offices, classrooms, or living rooms is the CO2 content. In fresh air, the concentration of carbon dioxide is around 400 ppm. This stands for “parts per ...
Researchers have developed a low-cost visible light communication (VLC) system using commercially available hardware that ...
Before the Raspberry Pi came out, one cheap and easy way to get GPIO on a computer with a real operating system was to ...
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