[Garrett] over at MaceTech was approached by a friend who needed a light-up mohawk installed on a Viking helmet, and he needed ... construct a sound-responsive LED mohawk. He had all sorts of ...

but [George’s] project is a homemade LED helmet that takes no shortcuts and packs the visor full of hundreds of individual lights. He started with a prototype that uses a PIC 18F4580 ...

Eventually, that goal led Ding to create the Lumos Kickstart Helmet ($180), whose LED lights not only increase a cyclist’s visibility but also blink to indicate if she is making a left or right ...

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