There are a lot of Arduino-based metal detectors using various technologies. This is one of them that uses direct frequency measurement.
Project tutorial by Andrius Purr
Sunglasses that serve an even more useful purpose than protecting the eyes of the blind. They can help them detect objects in front of them.
Project tutorial by GardnerTech
A pair of talking smart glass, intended to help the visually impaired.
Project tutorial by Amal Shajan
Speedometer that uses a GPS for speed sensing and an RGB LED to indicate speed to the user. Also features a blinking white light.
Project tutorial by Jeremy S. Cook
Move your hand around - lights ON. Move hands over that again - lights OFF. Cool, right?
Project tutorial by ashraf_minhaj
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