Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  

Go Back   > >

Electronics, Lighting, & Gadgets HRM, GPS, MP3, HID. Whether it's got an acronym or not, here's where you'll find discussions on all sorts of tools, toys and gadgets.

Thread Tools Search this Thread
Old 05-01-11, 10:05 AM   #1
Thread Starter
Join Date: Feb 2009
Location: Nottingham, England
Bikes: Specialized Hardrock 2008
Posts: 22
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!
slcp is offline   Reply With Quote
Old 05-01-11, 02:33 PM   #2
Senior Member
Looigi's Avatar
Join Date: Dec 2010
Posts: 8,942
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.
Looigi is offline   Reply With Quote
Old 05-03-11, 06:48 PM   #3
CaptainCool's Avatar
Join Date: Feb 2007
Location: san jose
Posts: 764
I remember popping up a few years ago. Unfortunately, no sales or technical information on their site, but you might want to email them.
CaptainCool is offline   Reply With Quote
Old 05-04-11, 06:57 AM   #4
Seņior Member
ItsJustMe's Avatar
Join Date: Sep 2005
Location: Michigan
Bikes: Windsor Fens, Giant Seek 0 (2014, Alfine 8 + discs)
Posts: 12,928
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.
Work: the 8 hours that separates bike rides.
ItsJustMe is offline   Reply With Quote
Old 05-18-11, 12:34 PM   #5
Junior Member
Join Date: May 2011
Posts: 5
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
Spencer87 is offline   Reply With Quote
Old 05-18-11, 04:17 PM   #6
Century bound
Phil85207's Avatar
Join Date: Jan 2010
Location: Mesa Arizona
Bikes: Felt AR4 and Cannondale hybrid
Posts: 2,253
That's a great idea. Let us know how it works out.
Phil85207 is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -6. The time now is 06:36 PM.