An Arduino based MP3 player with 30 levels of volume adjustment, 5 levels of EQ adjustment, and a pretty cool retro looking UI.
Project tutorial by Neutrino
An easily constructed USB-powered pulse oximeter device that can be built for around $25 and features an OLED display.
Project tutorial by Arduino “having11” Guy
A small compact outdoor motion-activated Halloween scare box with sound and optional light.
Project tutorial by syn
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