Picture of How to charge your mp3 player using Lego mindstroms NXT
I have seen many things ( not only Instructables) on generating power with the OLD Mindstorms lego set. However there have been no new ones. Since I couldn't find instructions on how to charge an mp3 player with the NEW set, I set off to do it on my own. I was able to do it, but found many other uses for the NEW lego mindstorms NXT and many ways to create power with it. Mp3 player chargers can use up lots of energy and this can get rid of it all so I hope you like my Instructable and use it to "green" up your day!

(This is also in the pocket-sized contest so please vote for me!)

Step 1: The Beginning

Picture of The Beginning
First, we are going to learn about the servo motors that come in the lego mindstorms NXT kit. These are our main tools because they will generate power. We can test this by first connecting a motor to another motor with one of the cables included in the kit. As you spin on of the motors, you can see that the other one spins too, showing that the motor is generating power. This is very basic, but it plays a big role in the final product.

***The second picture shows how to build the crank I used throughout my Instructable, it works very well but it helps to superglue the pieces together as legos can fall apart easily.
legonxt3 years ago
Does it really works?
p_b_r legonxt3 years ago
Yes, this can really work. The NXT motor acts as a power generator when you manually crank it. However, see my answer below to Etch3's question.
Etch36 years ago
wont that ruin your mindstorn?
p_b_r Etch33 years ago
This won't hurt the NXT motor.

The power generated by the motor, however, could be too much for whatever it's connected to. If you crank in the wrong direction, too fast, or too slow, you're generating a different power level than the MP3 player, or other device, is expecting,

So, there's a chance it'll hurt the device you've connected it to. But it won't hurt the motor.
ikestarm17 (author)  Etch36 years ago
only the cord, which you can easily replace
I liked the idea of attaching it to the hamster´s wheel!!! :D
i thought you were supposed to keep the red and black wires
ikestarm17 (author)  MadScientist1014 years ago
no white and black
S51145 years ago
Are the"small wires" you speak of on the female usb the metal pins, or insulated wire, P.S. How do yo get the plastic of of the female usb?
Lenny245 years ago
You Should add a 5V Regulator, so you dont' have to be Careful how Quick youre' Crankin'.
good idea
llamma10105 years ago
great instuctable!
p0g0685 years ago
 very nice dude ! simple and well explained thank you!
tawk5 years ago
I am pretty shure you could save your cable if you just use cat 3 cable (phone line), with a normal phone jack and just snap and sand off the little prong, that is there to keep it connected, so it will fit. I know it will not stay as securely but it saves you the cable.   =)
smilee6 years ago