USB clip light

thingiverse

This is a clip that integrates a 9V battery and a USB buck converter for use with a USB light. I designed this to be used on a clipboard or as self-standing on a desk, but it's too bulky to fit neatly on a book. The battery housing has polarity-dependent connections and only accepts the 9V battery in the correct orientation. I half-improvised the design of this clip so it fits the components I already had at home. Unfortunately, you might not be able to build it if you don't have the same components that I do. While the USB board is easy enough to find, and a suitable switch can probably fit with some hot glue, making the battery contacts requires a bit of improvisation as there is no suitable off-the-shelf component that I know of. In order for this to work, you will need: * A 6-24V to 5V 3A car USB charger module DC buck step-down converter * Any similar sliding mini-switch that fits * A 4mm diameter 26mm long rod for the hinge * Four really short 1mm screws for the battery compartment * Two 6-7mm long 1.6-ish mm diameter screws for the USB housing * A strong radial spring whose hinge isn't wider than 10mm * Some thin wires to connect the USB converter to the battery * Something to act as battery contacts... I improvised this by cutting a rectangle of PCB, filing away the copper in the middle to create two contact points, soldering some springy metal to it to make it springy. * An IKEA JANSJÖ or similar USB LED lamp You'll only need supports for the USB housing.