Datasheet

Pinouts

Evern though every pin from the Feather is 'doubled up' with an inner header, not all of the pins are actually used!

Power Pins

On the bottom row, the 3.3V (second from left) and GND (fourth from left) pin are used to power the SD card and RTC

(to take a load off the coin cell battery when main power is available)

RTC & I2C Pins