This looks like a fun little project for the electronics-inclined. It’s called the LEDCard, and it’s a credit card-sized macro ring light for your phone that wraps around your smartphone camera’s lens. And if you don’t have a smartphone capable of macro-focusing, don’t worry! LEDCard’s creator, MisterHW, has thought of you, too, with a recess to insert a moulded acrylic lens to help you focus closer.
The whole thing lives on a single PCB and uses rechargeable LIR2430 Lithium-Ion cells, which charge up over USB. Upon charging, the LEDCard requires no wires or cables. It’s turned on or off by the simple push of a button, and an LM3410 LED driver IC lights up all of the SMD LEDs, illuminating the view around your lens for close-up subjects.
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