****I take no responsibility for any injuries, fried computers, or anything of that manner. Follow these instructions at your own risk****
This is a simpler version of the Ladyada SpokePOV and the Monkeylectric Monkey Light. Unfortunatly, this version cannot spell words of pictures. It can however, make your bike stand out in the dark. This can be built in less than a day with less than $3.00 worth of parts (less if you have a bunch of LEDs laying around).
Step 1: The required parts
The parts needed for this build are very simple. They are:
-LED’s ~ I used four, but you can choose how many, and what colors
-Resistors ~(if needed) Choose resistors that fit your leds and battery (I used 2 100ohm resistors with my 2 volt red LEDs and my 4.5 volt battery
-Batteries~ I used 3 AA batteries to make 4.5volts
-a Switch ~ To turn it on and off
-Zip Ties ~ To attach it to your spokes
-a Straw ~to hold and diffuse the leds
The tools are also very simple:
-basic soldering tools
-hot glue gun
Step 2: The Schematic
The schematic is very simple too. All it is is 3 batteries connected in series to form 4.5 volts, then the LED’s with their resistors connected to the battery. Their is also a switch on the negative wire between the batteries and the LEDs. I have attached the schematic below.
Step 3: Build the Battery Pack
Now comes the fun part… building it! It’s very simple, and only requires very basic tools and skills.
First, you need to build your battery pack. I used 3 AA batteries. To do this, glue your 3 batteries together, side by side, so that if you look at the end of the batteries, you will see either +-+ or -+-. This makes a more compact battery pack than if you were to just put your batteries end to end. Now, looking down on the battery, you should see -+-. Tape a short piece of wire to the first battery’s negative pole. Tape the other end of the wire to the second battery’s positive pole. Now tape a long wire to last battery’s negative pole. This will be your negative lead on the finished battery pack.
Now, flip the batteries over. Make sure the battery that the negative lead is connected to is to the right. Tape a long wire the the first battery’s positive side. This will be your positive lead. Now tape another short wire to the second battery’s negative lead. Tape the other end of the short wire to the last battery’s positive pole. Finally, wrap lots of tape around the battery pack. This will prevent the wires from coming loose when the bike wheel is spinning.
Step 4: Assemble the LEDs
Now we need to solder together the leds. This step is very simple.
Start by soldering the resistor that goes with you LED to the negative lead of your LED. Then, solder a wire to the positive lead of the LED and the other side of the resistor. Cover all of your connections with hot glue to make them water proof.
Now, repeat this step for all of your LEDs.
Step 5: Build the Light Tube
In this step you will build the tube that diffuses the LEDs.
First, you need to cut two holes in the center of your straw. These will hold two of your leds.
Now you need to decide on a pattern for your leds. I chose to use four red leds, so I did not need this step, but is you have more than one color, you will want a pattern.
Now, glue one of your leds in each end of the straw. Also glue one of your leds in each hole so that the leds are pointing out.
Thats it, you have now assembled all of the main components of the LED POV.
Step 6: Putting it all together…
Now, we need to put it all together. This step includes soldering the light tube to the battery pack and inserting a switch.
First, solder one wire of the negative lead of the battery pack. Then, solder the other lead of the switch to all of the LED’s negative leads. Finally, solder the positive lead of the battery pack to the positive leads of the leds.
Now you have finished assembling the LED POV. Test it by flicking the switch. If all is good, there should be no smoke and it should light up.
Step 7: Attach it to your bike
Now you need to attach it to your bike. I chose to put it on my back tire, but either should work fine. Using zip ties, attach the battery pack to your spokes. Put it near to center of the wheel. This is because there is less force in the center of the wheel. Now, attach the light tube to the spoke with zip ties.
That’s it, you are ready to go.
Step 8: Results and Possible Improvments
Over all it worked pretty good. The one thing that I noticed is that you need to be going really fast to get the full effect. This could easily be fix by adding a couple more light tubes.