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Old 05-13-13, 06:45 AM   #1
JonnyHK 
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Brake light with accelerometer

http://www.bikerumor.com/2013/05/13/...ht/#more-60037

Looks like a much more practical and reliable solution to something that folks have been tinkering with for years.
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Old 05-13-13, 10:25 AM   #2
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I have a dyno brake light. Haven't put it on a bike yet
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Old 05-13-13, 11:05 AM   #3
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Seems a bit steep. Adding an accelerometer should only add maybe $8 to the cost of a brake light, and that's on one-off pricing, like if I just went to Digikey and bought a single accelerometer chip. It should interface fine to the processor that's already there in the light.
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Old 05-13-13, 05:28 PM   #4
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Velodroom bike light

Well... as an engineer working on a similar, but less expensive and way better looking
bike light, I can tell it is not the components that cost. Electronics add maybe 4$ to this project.
Main expenses are probably R&D and marketing. Still, 100$ implies a bit too large contribution
from the backers to get their production costs down. After that they may reduce the price,
but not holding my breath for it. Just my biased opinion.

Project I'm working on: http://vd.ee
and a brief Velodroom trailer/teaser
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Old 05-13-13, 05:53 PM   #5
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Quote:
Originally Posted by Indrek Rebane View Post
Well... as an engineer working on a similar, but less expensive and way better looking
bike light, I can tell it is not the components that cost. Electronics add maybe 4$ to this project.
Main expenses are probably R&D and marketing. Still, 100$ implies a bit too large contribution
from the backers to get their production costs down. After that they may reduce the price,
but not holding my breath for it. Just my biased opinion.

Project I'm working on: http://vd.ee
and a brief Velodroom trailer/teaser

Much better looking and more practical (mount etc)..
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Old 05-14-13, 05:20 PM   #6
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Velodroom now also covered in bikerumor: http://www.bikerumor.com/2013/05/14/...ve-bike-light/

We are also working on front light and want to make it the best one in the world,
so any feedback-suggestions-comments are welcome.

Last edited by Indrek Rebane; 05-14-13 at 05:24 PM.
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Old 05-14-13, 08:49 PM   #7
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Interesting and thanks for sharing. I have thought of fitting a Busch & Mueller BrakeTec as I run a dynamo on one of my bikes.


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Old 05-15-13, 03:24 AM   #8
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Interesting and thanks for sharing. I have thought of fitting a Busch & Mueller BrakeTec as I run a dynamo on one of my bikes.
Busch & Müller TOPLIGHT line brake plus is pretty good. Probably best you can get just now.
Good engineering and ingenious operating principle. Also very reasonably priced.

Velodroom is working on dynamo model as well, but this will not be on the market before 2014.
Dynamo connection is currently mandatory for bike lights in Germany by StVZO TA. Of course
we will do our best to make better light than B&M. However, if you need one now there is no
match to B&M as far as I know. And this comes from their competitor.
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Old 05-15-13, 09:16 AM   #9
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AIUI B&M uses a frequency comparator to detect when the bike is slowing (from the dyno hub). That seems likely to be cheaper (all electronic) than adding an accelerometer into the mix.
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Old 05-15-13, 02:17 PM   #10
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AIUI B&M uses a frequency comparator to detect when the bike is slowing (from the dyno hub). That seems likely to be cheaper (all electronic) than adding an accelerometer into the mix.
Accelerometers (and gyros), as used in cell phones for example, are inexpensive solid state electronic devices.
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Old 05-16-13, 01:04 AM   #11
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Accelerometers (and gyros), as used in cell phones for example, are inexpensive solid state electronic devices.
This is indeed so. However, electronic components are not the main
cost in a project with low volumes. Less than 20 000 pieces, say.
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Old 05-16-13, 07:55 PM   #12
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I came across these http://www.ebay.com/itm/111058289337...84.m1497.l2649.

can't beat the price. I order 2 of these to use on my bike rack to improve the brake light visibility. sinc my bike blocks my brake lights.
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Old 05-18-13, 11:13 AM   #13
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As the hub dynamo has Power pulses, the B&M one lights brighter as the Pulse Frequency drops .
in normal operation there is a capacitor to smooth out the pulses

Flashing tail lights are verboten in German bike regulations.
but Asian Export Stuff sells withall those flashing Modes.
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Old 05-27-13, 02:43 AM   #14
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Originally Posted by ItsJustMe View Post
Seems a bit steep. Adding an accelerometer should only add maybe $8 to the cost of a brake light, and that's on one-off pricing, like if I just went to Digikey and bought a single accelerometer chip. It should interface fine to the processor that's already there in the light.
99% of lights do not have a processor on them, they're mostly special purpose custom cheap silicon that can do very limited things
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Old 05-27-13, 05:48 AM   #15
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99% of lights do not have a processor on them, they're mostly special purpose custom cheap silicon that can do very limited things
OK, so add about 80 cents minus whatever the custom silicon costs, to the total cost. 80 cents is what I can buy small processors for in relatively small quantities (100+) In 5000 quantities, it's down to about 60 cents or less. The accelerometer is a more significant cost, they're usually a couple of bucks in the quantity I buy, but I'm sure when you start buying a few thousand the price drops considerably.
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Old 06-13-13, 05:19 AM   #16
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I'm glad to announce that things have moved a notch closer with Velodroom bike light.
Today we are launching our Kickstarter campaign and hopefully reach our set goal.

Kickstarter page:
http://www.kickstarter.com/projects/velodroom/velodrooms-smart-bicycle-light
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