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IKEA Hack: Solar Powered Bike Light

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In school this year, I have a pretty late schedule. Sometimes i'll be coming home from class after
sundown and with a bike that can be dangerous. Before purchasing a commercial bike light, I decided to see if I could make one myself. Using an IKEA lamp I found at goodwill (for $2) I figured I could make a pretty unique, environmentally friendly bike light. The lamp that I will show in this instructable can be found here. It uses a solar panel and re-chargable batteries which provides 3.6 volts to light several LEDs. The solar panel takes about 9 hours to charge and can provide 3 hours of light. I thought those specs were perfect for embedding a microcontroller (such as an attiny) to make a stylish bike light. Here are some features of the complete bike light:

-Solar powered

-about 3 hour battery life

-backpack mountable

-extra bright with 4 LEDs

-8 different LED animations (selectable via a push button)

This project is great for students, bikers, makers, and anyone who enjoys tinkering with electronics! And best of all it is not expensive to make. The parts list won't set you back more than $3 (assuming you already own the lamp). However, before we begin here are some warnings I want everyone to acknowledge before continuing:

WARNING!: GREEN LIGHT IS NOT AN ACCEPTABLE COLOR FOR BIKING. I USED GREEN LEDS FOR STYLE. WHEN I USE THIS WITH A BIKE, I WILL NEED TO USE EITHER WHITE OR RED!

DISCLAIMER: I AM NOT RESPONSIBLE FOR ANY HARM DUE TO THE MAKING/USE OF THIS BIKE LIGHT.

Once you have acknowledged these warnings, lets begin gathering our parts for this project!

 
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Step 1: Parts

You'll need these parts:

-attiny85 (or attiny45)

-4 LEDs

-4 100 ohm resistors

-1 SPST button

-SUNNAN LED lamp

You'll need these tools:

-Soldering iron (with rosin)

-Hot glue gun

-Dremel

-Wire strippers

-Optional: Multimeter

bigbroimc1 month ago

This would be a great idea for a disaster kit I'm making. Could you write the code to blink S.O.S?

Just a thought.

bergerab (author)  bigbroimc1 month ago

Absolutely! Could you describe exactly what the S.O.S. blink should look like? Thanks for your comment

Here is a link that shows the light flashes for S.O.S.

bergerab (author)  bigbroimc1 month ago

After a little googling I actually found someone who got an "S.O.S." blink working on his arduino. Here is a link: http://www.instructables.com/id/SOS-signal-with-an...

All you have to do is write a new function named "sosFlash(){ }" or something similar. And between the curly braces, add the code from the instructable I linked you to.

Thanks for the comment!

I like this :D Very neat.

bergerab (author)  tisaconundrum1 month ago

Thanks so much! If you get around to making your own, please attach a picture!

I will. I could probably go as far as turning it into a phone charger as well.
kenyer1 month ago

Someone had the idea for this as a reply on my Sunnan-hack. Really cool that you actually did it. http://www.instructables.com/id/Easy-IKEA-SUNNAN-hack-non-destructive/

bergerab (author)  kenyer1 month ago

Thanks a lot! And yeah I actually saw that comment after I wrote this instructable but It's funny that we both had the same idea!

kenyer1 month ago

The Sunnan battery life is actually not that great, so it might be an idea to change the batteries.

brmarcum1 month ago

Very cool idea. Completely repurposing that lamp was very innovative. Good job.

bergerab (author)  brmarcum1 month ago

Thank you so much! And if you are interested, I took all these pictures with my smart phone (an HTC ONE) instead of my usual cannon t3i. So you too could take pictures like this in expensively. It's all about editing! Thanks again for looking