Bicycle LEDs

Hi Everybody,
I have made a series of LED lights on my bicycle spokes, for driving at night. I use a 9 volt battery with 9 pieces of white LED 3.3 volts, which I connect each with a 330 ohm resistor 9 pieces 1/4 watt. its durability is approximately 30 hours later the lights dimmed, is there any way to be more durable ?

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iceng5 years ago
See Ladyada POV spoke lights run for days er nights
I use them at burning man.  .  .  .  .  A
pro5200 (author)  iceng5 years ago
yeah very cool bike lights, this is similar to monkey electric is not it?
unfortunately I am not an electronics expert, but I greatly appreciate your advice :)
iceng pro52005 years ago
The reply was to show AA battery mounting.

rickharris5 years ago
There are really only 3 ways to make the battery last longer:

1. Use a bigger resistor - reduce the current BUT get a dimmer LED

2. Use electronics (usually a micro controller but there are other ways) to turn the LEDS of and on very quickly - If it is faster than 25 times a second the eye sees the LED as always on BUT you can reduce the current by a lot this way. Example if the LED is on 50% and off 50% then you use half the current.

3. Install a larger capacity battery - or recharge a battery pack from a dynamo.

4. I guess as a 4th option you could run the whole thing from a dynamo on the bike.
pro5200 (author)  rickharris5 years ago
thanks that is very good, using the dynamo for charging the batteries,
I think I've read the instructions here, "n_n
it looks like I need a LED driver circuit for my 9 pieces LED
frollard5 years ago
Great project and good to see you hooked it up with a proper resistor. It could be done more efficiently with 1 resistor for every 2 leds but that'll do.

If you want it to last longer, get a bigger battery (6 AA batteries will last 10x longer than 1 9volt and cost similar.

to be more DURABLE, encase everything in something strong, like hot glue.

Add a switch so it only turns on when you're moving.

Mount the batteries in a piece of clear plastic tubing evenly spaced around the wheel so they don't unbalance the wheel. Waterproof AND awesome.
pro5200 (author)  frollard5 years ago
thanks for your advice, but for the 6 AA battery placement may be a little difficult, I put the 9 volt battery in a bicycle hub fastened with cable ties, sorry I could not enter the picture here. There are other suggestions maybe?
canucksgirl5 years ago
Have you looked to the right ----> under "related" for other LED bicycle projects?
pro5200 (author)  canucksgirl5 years ago
yes I've seen some instructions, and here's the link that I instance: