The first v2.1 watches I made 3 years ago worked perfectly for a time, but then, after I thought the batteries were dying (way before predicted), they would start glitching through the led animations and then dimly strobe random LEDs until I replaced the battery. Being the noob I was, I hadn’t realized that running a 16Mhz Femtoduino at < 3v3v was not a good idea, as it essentially over clocks the IC. Revisiting that project today, it popped into mind that this problem was happening, so I’m looking at 8Mhz crystals in the same package for a replacement that will fix the glitchiness and allow a year’s battery like it should.

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Watch v2.1’s Glitchiness

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