How to charge your mp3 player using Lego mindstroms NXT

Step 6 Put it all together

Now we have to solder the NXT connector cable to the female USB port. We have to make sure that the polarity is correct so we can crank the motor the easy way, not the hard way. Place the port with the 4 "nubs" on the inside are pointing up and so the white plastic side is pointing toward you. Now, solder the white wire on the left wire that is sticking out and the black one to the right wire that is sticking out.

Next, plug your crank onto your motor, your connector cable onto your motor, your USB cord into the female USB port, and your USB cord into your mp3 player.