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Old 05-01-11, 10:05 AM   #1
slcp
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Cycle-computer/Speedo drive LED display...seen any such projects out there?

I am hoping you were enticed by the title.

What I am looking for is existing set-ups, diy set-ups, knowledge base to create a set-ups or anything else that might help me to do the following...

I want to mount a display (I am thinking LED display for no particular technical reason) on the rear of my rack that displays my speed, I want to try and make car drivers aware of what speed bikes are capable of travelling for most of my real near-misses happen when a driver has not even considered or grossly underestimated how fast I might be travelling.

I want it to be an awareness tool...

So if anyone knows of any such products/projects or can advise me of the feasibility and difficulty of implementing the above I would be super grateful!
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Old 05-01-11, 02:33 PM   #2
Looigi
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Quote:
Originally Posted by slcp View Post
...most of my real near-misses happen when a driver has not even considered or grossly underestimated how fast I might be traveling.
That's definitely a problem. My wife nearly got taken out a week ago when we were going through a green light at about 35 mph when a driver though he had plenty of time to pull out in front of her. I had already passed him and I would have though my speed would have alerted him to how fast we were going. Then there also the all to frequent "right hook" and the pinch off.

You're idea is certainly feasible, though I don't know how much good it would do. What I'd do is use a typical magnet and reed switch sensor and hook it up to a PIC microprocessor to calculate the speed and code the output to a 7 segment equivalent array of LEDs driven with a few driver chips ....perhaps 4 LEDs making up each segment. Maybe find a binary to 7 segment decoder/driver chip if they still make things like that. Flashing it would be a good way to reduce power consumption by a factor of 2 or more while increasing conspicuity.
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Old 05-03-11, 06:48 PM   #3
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I remember http://speedvest.com/ popping up a few years ago. Unfortunately, no sales or technical information on their site, but you might want to email them.
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Old 05-04-11, 06:57 AM   #4
ItsJustMe
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This should be relatively easy to do. Pick up an Arduino development kit for $30, all you need is a standard bike computer sensor and the display and a battery, plus maybe one or two evenings to do the programming.

I'm pretty sure that people have already done Arduino projects to build their own bike computers with a ton of features, but to do something this simple it'd probably be just as easy to just roll your own from scratch than to try to adapt something else. You'll need to write the display code anyway.
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Old 05-18-11, 12:34 PM   #5
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something else that might be useful is like a range finder to show a driver how close they are because I'm guessing some drivers don't actually know close they are to a cyclist
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Old 05-18-11, 04:17 PM   #6
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That's a great idea. Let us know how it works out.
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