Datasheet

This FeatherWing will make it real easy to add datalogging to any of our existing Feathers. You get both an I2C real

time clock (PCF8523) with 32KHz crystal and battery backup, and a microSD socket that connects to the SPI port pins

(+ extra pin for CS). Tested and works great with any of our Feathers, based on ATmega32u4, ATSAMD21, Teensy, or

ESP8266.

We recommend the Arduino's default SD library to talk to the microSD card socket. On ESP8266, the SD CS pin is on

GPIO 15, on Atmel M0 or 32u4 it's on GPIO 10. You can cut the trace to the default pin and change this to any pin. To

use the RTC, use our RTClib library. If you need a precision RTC, check out our DS3231 FeatherWing