Our shopping trolley with charger to devices it works with two types of renewable, solar and kinetic. They work automaticaly, without necessary of intervetion human.
And sorry for my english, I'm using a translator.
We'll need these itens :
1x motor 5v 1x reduction gear ( You can get it of a ventilator, like me )
1x painel solar 6v
2x diodos 4007
1x transistor 7805
1x insulating tape
5x ( or more) plastic clamp
3m of cable
1x shopping trolley
Step 1: Engine Base
After pick off the wheels you can use like engine base, 2 pieces of wood, like
nail file or pallets of ice cream. Cut with 4 cm and other with 3 cm. You can use insulating tape to fix
Step 2: Gear With Wheels
Use the plastic clamp to fix the wheels with the gear
Step 3: Fixing Engine and Gearbox
Place the other gear in the engine using glue, then attach the motor to the base using insulating tape and plastic clamp( use as much as you want) , after place the wheels and fitting.
Step 4: Painel Solar
place the solar panel on the grid, you can use insulation tape or plastic clamp
Step 5: Using Diodos
On the positive out of motor and painel, place the diodo
Alert: remember of make a test using a multimeter to see what side the diodo allows current flux and isolate all of diodo.
Step 6: Transitor
To instal transistor( looking the side with number) you have to put on the possitive cable ( with diodo ) on the left side, on mid is the negative and the right is the exit with 5v. Then isolate with tape
Step 7: USB
To instal usb remember, do you need instal the positive side, the 'out' of transistor, on the left, and negative on the right, like on the photo. After isolate and attach, I improvised using insulating tape.
Step 8: It's Done
It's done now just test, if don't charge walking, find littlest wheels