Bikes Fun & Games
Joyrider bike POV
joyrider1.jpg
joyrider2.jpg

Wow – ultracompact smiley bicycle spoke POV!

Designer Moritz Waldemeyer has created Joyrider, a product that creates illuminated smiley faces on rotating bicycle wheels.
Joyrider consists of two electronic devices that clip onto wheel spokes. They measure the speed of rotation and emit LED light to create the illusion of a stationary smiley face as the wheel spins.

They went for £2000 @ a charity auction, I’m guessing a bit cheaper as a remake – Link

Related:

SpokePOV Kit – Link

20 thoughts on “Joyrider bike POV

  1. I should imagine it would be using an accelerometer.

    When the sensor is at the top of the wheel, it is pointing one way, thusly reading +g

    Rotate the wheel 180deg and the sensor will be the other way up, reading -g

  2. An accelerometer would be too complicated–you are forgetting radial acceleration. Even finding the points of max and min a would be a pain, let alone taking into accounts real changes in speed.

    A magnet, or better yet a simple brush, would be much easier to manage.

  3. Would the small three pin device with the text:

    41A
    648

    be the key to an answer what is used here ?

    Could it be a bipolar hall effect transistor….

  4. Hessel,

    Which image are you looking at? I can’t make out enough detail to read the text on the components :-/

  5. Hi guys, it is indeed a hall effect sensor (unipolar). The disadvantage of this is that the sensor uses more battery than the LED itself. So far I haven’t found one with a decent current consumption, if anybody knows one, please post it…
    The other components are a PIC, LED, resistor, two batteries.

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