Datasheet

The SD Card also has a Chip Select line, labeled SD. This pin can theoretically be changed by cutting the jumper
trance and soldering a small wire from the right-hand pad to the pin you'd like to use.
On the ESP8266, SD is pin #2
On the ESP32 SD is pin #14
On the Atmega32u4, ATmega328P, nRF52840, SAMD21 M0 or SAMD51 M4 Feather, SD is pin #5
On the Teensy Feather, SD is pin #8
On the WICED Feather, SD is PC5
On the nRF52 Feather, SD is pin #27
There is also an Card Detect (CD) pin which is not connected to any pads but you can use to detect when a microSD
card has been inserted have occured. It will be shorted to ground when a card is not inserted.
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