![a micro-sd adapter with 7 0.1"-pitch header pins soldered onto its contacts](https://scruss.com/wordpress/wp-content/uploads/2021/05/IMG_3109-1024x575.jpg)
It’s only a serial SPI interface, but you can’t beat the price. It should only be used with 3.3 V micro-controllers like the Raspberry Pi Pico, since micro-SD cards don’t like 5 V directly at all.
You might want to pre-tin the pins and apply some extra flux on both surfaces, because these pads are thin and you don’t want to melt them. I used my standard SnAgCu lead-free solder without trouble, though.
![label sticker image for 7 pins, from left to right DO, GND, CLK, 3V3, GND, DI, CS](https://scruss.com/wordpress/wp-content/uploads/2021/05/sd_pins.png)
Made entirely with netpbm
You only need to use one of the Ground connections for the card to work.