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Recently I embarked on a new project: creating a bracelet of LEDs. But not just any old bracelet. This one has the ability to be changed using a mobile phone, using a technology I've written about in the past called NFC.   Essentially the idea of this bracelet is: - Input a colour sequence in a phone app - put the dynamic NFC tag connected to the bracelet against your phone - turn on the bracelet. Bracelet reads the sequence from the tag and displays the pattern.   To do this we n ...