USB clip light
Description
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. It's too bulky to be used on a book. The battery housing is polarity-dependent and only accepts the 9V battery in the correct orientation. I kind of half-improvised the design of this so it's made to fit the components I already had at home... this unfortunately means 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: * [This USB buck converter](https://www.ebay.co.uk/itm/6-24V-12V-24V-to-5V-3A-CAR-USB-Charger-Module-DC-Buck-step-down-Converter-L/192031856043?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160908105057%26meid%3D70529ea55e2e4a0199c2b7ab33ed1d33%26pid%3D100675%26rk%3D1%26rkt%3D15%26mehot%3Dnone%26sd%3D192031856043%26itm%3D192031856043%26pmt%3D0%26noa%3D1%26pg%3D2380057&_trksid=p2380057.c100675.m4236&_trkparms=pageci%3Aa8485f53-7d8c-11ea-9fa8-74dbd180ca17%7Cparentrq%3A73c72fca1710aa12e54208ffffe82da2%7Ciid%3A1) * Any similar [sliding mini-switch](https://www.ebay.co.uk/itm/ON-OFF-SPDT-1P2T-2-Position-3-Pin-PCB-Panel-Mini-Right-Angle-Pins-Slide-Switch/223593826730?hash=item340f3b09aa:m:mGz-trPVwee9tn-NlEGdTSA) that fits (I can't find the exact one I used, see image). * A 4mm diameter 26mm long rod for the hinge (can be threaded but doesn't have to be) * 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 (I wound my own from windshield wiper blade stiffener rods but I don't really recommend doing that) * 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, filed away the copper in the middle to create two contact points, soldered some springy metal to it to make it... springy. There's a slot in the battery housing that the PCB can slide into. * An IKEA JANSJÖ or similar USB LED lamp You'll only need supports for the USB housing.
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