Portable Battery Charger

Have you ever experienced that your phone died while you were on a hike? Annoying, right? Hi, our names are Izabella and Julie and we have found the solution for you! We are going to show how we generate energy by hand movement in a very human design. Then we are going to store that energy in a self-charging battery. It's as simple as it sounds!

Below, you'll find the guide in how to make the 'hand-generator'. The project is purely based on electromechanics, so note that this project has had many solved difficulties with the laws of nature.

With that said, let's get started!

• wooden boards
• 2x lego technique bar
• 4x lego spacer
• 2x lego bar with ribs 
• 2x lego medium length rod
• copper wire 
• 2 large sprocket
• 2 small sprocket
• self-charging battery 
• 2 small magnetics
• plus and minus pole wire 
• a box 
• rope
• 2x cutter knife
• adhesive tape 
• drilling machine
• glue

Take a medium length rod and slide a large and small sprocket onto it, do this 2 times. 1 should come slightly higher than the other, this can you determine by the spacers.

We are gonna call the right one the large gear setup and the left one the small gear setup.

Using superglue(and tape as reinforcement) you are going to stick the 2 magnets to the small gear setup. 

Now make a round flat coil and attach the 2 ends to the plus and minus pole wires of the self-charging battery

Take a wooden board and saw it to the length you desire, don't make it too small. Drill 2 holes 2.5cm apart (the 2 gears need to fit in each other) in it, paste and stick a lego technical rod so that the holes are on top of each other. 

You are going to stick a second lego technical rod on the bottom of the wooden board, the holes need to mach.

Now you're going to put everything together.

You put the coil on the furthest hole and on that you put the smaller gear setup (the one with magnets), next to it you put the larger gear setup. Make sure that the big sprocket of the larger gear setup matches with the small sprocket of the small gear setup. You can use Duck tape of glue for firmness.

You take the metal part of the cutter knife and replace the knife with a little piece of wood. Then you are going to make glue lines and stick them together and on the lego bar with ribs. Do this 2 times, 1 time on the bottom of the lego bar with ribs and 1 time on the side of the lego bar with ribs.

Then take a nail and glue it to the piece of wood and stick it in the glue.

Glue or tape the small cutter knife on the wooden board. You can change the position of the large gear setup so that the bar is connected with the gear.

Take your box and make a hole in it to allow the ribbed rod to pass through. You can soften the bottom with fabric, to give you construction some security, . 

Now put everything in the box, you are going to need to cut the box and tape it back together.

You are done, now you can decorate the outside of the box.

Watch the video.