LED Bike Turnsignal

Hey everybody, this is my first adventure with soldering or LEDs, so hopefully it will go well. I'm planning on making a set of turn signals for my bicycle with two LED arrows which work at 12v, I'll power it with 8 AA and use one momentary switch for each. Does this all seem like it should work? Specs on each piece: arrows : "Mini Arrow Size: 1.50” x 1.50” ,Operational voltage: 12-14 Volt AC/DC" switch: "This momentary switch is perfect for short connections. Normally open and rated 3 amps at 125VAC."

Picture of LED Bike Turnsignal
switch.jpg
blknwhtfoto (author) 10 years ago
I hadn't thought about how fast the batteries would die out. The reason I thought about using AA's instead of a sealed battery is that I'm a photographer and have a ton of rechargeables lying around. I suppose I could wire it up and try it, if it doesn't last too long then I'll figure out a new batt system. I'd like it to flash, but I'm not sure how to work that out. Maybe just get a flasher for a car? I'm pretty sure it's just a fuse. Any ideas on getting it to flash? Thanks for the link. I'll need all the help I can get.
> I'd like it to flash, but I'm not sure how to work that out. Maybe just get a flasher for a car? I'm pretty sure it's just a fuse. Any ideas on getting it to flash? . A flasher from a car (at least cars from the 60-70s, not sure about newer cars) will work, but may drain a lot of your battery. They use a bi-metal strip, heated by the current drawn by the lamps. May not be that big of a deal, but something to look at. . Don't understand the fuse comment. . Maybe a 555 circuit? Might have to use a SSR or mechanical relay to handle the current. . . Have you thought about using a single 3-position, center off rocker switch, a la motorcycles?
There will be no problem with life span of the AA when riding... since only momentary they will operate for long rides.... But you will probably need to recharge after each ride... if you want full brightness... My guess is you picked that switch because they are easy to hit on/off quickly with your finger, thus imitating a "real" indicator... This is what i'm doing but not with arrows... Good luck..! :) I use 6 Le'D's, in my head light and tail light. I can comfortably ride for 6 hrs before they start to get to dim for my liking... I run 3 x 1.5v AA's and this has worked out great for me!
CameronSS10 years ago
I think I understand what you are trying to do, but I'm not sure, so correct me if I'm wrong. You want to have these two LED arrows mounted on the back (or front, I guess) of your bicycle, and have a pair of buttons on the handlebars, such that when you press a button, the corresponding arrow lights up, but does not blink. Correct? It seems like it should work. 8AAs may wear out annoyingly quickly, though. I would recommend a small sealed lead-acid battery, or a pack of rechargeable batteries.

Oh, and if you haven't found it already, here's the soldering Instructable.