Wow - ultracompact smiley bicycle spoke POV!
Designer Moritz Waldemeyer has created Joyrider, a product that creates illuminated smiley faces on rotating bicycle wheels.They went for £2000 @ a charity auction, I'm guessing a bit cheaper as a remake - Link
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.
Related:
SpokePOV Kit - Link
Posted by Collin Cunningham |
Mar 5, 2008 12:10 PM
Bicycles |
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How do they "measure the speed of rotation" ?
Is there a magnet involved and a hal effect sensor ?
Reply to this comment
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
Reply to this comment
Sounds good !
Reply to this comment
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.
Reply to this comment
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....
Reply to this comment
Hessel,
Which image are you looking at? I can't make out enough detail to read the text on the components :-/
Reply to this comment
Just had a look on ladyada.net, and it most probably is a Hall effect sensor:
http://ladyada.net/make/spokepov/makespokepov.html
Reply to this comment
@Mr Dan
I found this photo with a slightly higher resolution:
http://bp0.blogger.com/_i9rXZ8BZKVY/R8yT_cFZHMI/AAAAAAAAAHQ/HqyJP_pBY2Q/s1600-h/IMG_6117.jpg
I also expect it is a Hall Effect sensor. I was wondering if it would be possible to apply this on a Car, where there is no place to put the magnet close to the sensor.
Reply to this comment
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.
Reply to this comment
Allegro A3213 and A3214
Micropower, Ultra-Sensitive Hall-Effect Switches look good !
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