USB Tiny Tools - Screwdriver

This Instructables shows how to reuse old USB battery pack power some tiny tools.

I found many old USB battery pack when I tidy up my room. It mostly come from gift and souvenir. Their capacity often very low, and mostly only can output 500 mA, It is hard to treat it as a backup battery for the current mobile. But I think the old USB battery still can power a bunch of tools.

The first tool I would like to make is a tiny screw driver. When I repairing my gadgets, I need to screw in and out tens of screws, but I don't want the high torque of a normal electric screwdrivers hurt the tiny screws. So I want to make a tiny screwdriver to help me the screwing work.

USB Battery Pack

Don't buy a new one, just find some in your drawers.

Interchangeable screwdriver set

something like this: https://detail.tmall.com/item.htm?id=520149044454

USB Type A male break out board

For getting USB power.

N20 Micro Metal Geared motor

1:298 gear, 3mm or 4mm D shape Axle.

Axle Shaft Coupler

The size depends on your screwdriver set adapter and motor Axle.

6 feet 3 files ship switch

For switching motor rotation direction.

Screws

2 M3 x 6 mm screw for fixing USB breakout board; 6 M3 x 8 mm screw for assembling the case.

Just print both side, a and b, with your 3D printer default normal or low quality setting is good enough.

Cut the screwdriver adapter and connect it to the axle shaft coupler.

Connect the other side of axle shaft coupler to the Motor.

• Connect USB power to the ship switch middle feet
• Cross connect left and right side feet of ship switch to make a motor direction control circuit
• connect motor to the ship switch right side feet

1. Put the motor and ship switch into the case side a.
2. Screw in the USB break out board with 2 M3 x 6 mm screws.

1. Put case side b on the side a.
2. Screw in 4 M3 x 8 mm screws.

You may:

• Direct connect the tiny screwdriver to the USB battery pack.
• If the battery too big, you may connect with a USB extension.
• If you do not have a battery pack, you may connect it to a USB power adapter

Now you have a tool help you screw in and out tens of screws!