I have this PCB SD card reader:
The pins are GND, 3V3, 5V, CS, MOSI, SCK, MISO, GND.
How do I interface it with something else? Is it possible to wire these pins to a USB plug? How? Or another interface?
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Depends on what your end goal is.
Such a PCB is most likely designed to be used with, say, a microcontroller - for example those used by Arduino's, mBeds, etc.
You couldn't directly connect it to USB as the two have completely different signalling protocols. SD cards don't have the capability to be a USB slave device, so connecting it up to a USB port would likely just break something. In order to make a USB SD Card reader, you need a USB mass storage controller designed to make the bridge between the USB protocol and that used by the SD card. This could be either a chip designed specifically for the task, or a programmable microcontroller which you have written software for to allow it to act as a USB MSD and an SD card host.
If however your goal is simply to connect an SD card to a computer, the simplest solution is to just by a card reader, there are hundreds of different brands and products all largely doing the same thing. Many Laptops and PCs already have card readers.