Battery life is going to be important so I'd multiplex them using a MAX7219 chip for each side of the wheel. That way you can have 64 LEDs per side but only 16 LEDs will ever be on simultaneously so battery power draw will be reasonable.
Throw in a Hall sensor and you can sync them to the turning of the wheel
QuoteThrow in a Hall sensor and you can sync them to the turning of the wheel Can you synchronise the scanning of a MAX7219 chip?
so you'd have to pedal *really* fast to get anywhere near the Nyquist frequency
If I were doing the project I would use a lytheim battery at 9V and have groups of three LEDs and one resistor. I would run the LEDs at 10mA.
Is the idea really to have the LEDs on the RIM of the wheel ( NOT down the spokes)?
Quote from: Marvin Martian on Jul 05, 2013, 01:51 pmIs the idea really to have the LEDs on the RIM of the wheel ( NOT down the spokes)?How does that work - what about the brakes?
My question is....how to get power from battery to a rotating wheel. Where to mount the battery....without throwing wheel balance all off? -- some kind of "brushes" or spring contacts?-- or use two batteries opposite each other on each wheel?
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