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Bicycle LEDs Answered

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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user
iceng (author)2012-02-25

See Ladyada POV spoke lights run for days er nights
I use them at burning man.  .  .  .  .  A

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pro5200 (author)iceng2012-02-25

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 :)

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iceng (author)pro52002012-02-26

The reply was to show AA battery mounting.

A

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rickharris (author)2012-02-25

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.

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pro5200 (author)rickharris2012-02-25

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

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frollard (author)2012-02-24

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.

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pro5200 (author)frollard2012-02-24

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?

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canucksgirl (author)2012-02-24

Have you looked to the right ----> under "related" for other LED bicycle projects?

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pro5200 (author)canucksgirl2012-02-24

yes I've seen some instructions, and here's the link that I instance:
https://www.instructables.com/id/LED-bicycle-wheels/

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