Datalogger + RTC

FeatherWing with midroSD card and Real Time Clock (RTC).   RTC requires CR1220 coin cell battery.   I2C real time clock (PCF8523) with 32KHz crystal and battery backup.   microSD uses SPI port pins for connection, and the Arduino default SD library.  

Adafruit P/N 2922

Adafruit hookup guide

RTClib

 

microSD SPI Bus Connections

SPI	ESP8266	Atmel M0,M4,328P,32u4	Argon/Boron
SCLK (SCK)		pin 24	pin 11
MOSI (SDO/SDI)		pin 23	pin 12
MISO (SDI/SDO)		pin 22	pin13
SS (CS)	GPIO 15	GPIO 10	pin 10 [A5]

[pin name]

 

RTC I2C Bus

I2C	ESP8266	Atmel M0,M4,328P,32u4	Argon/Boron
SDA			D0
SCL			D1

The SCL and SDA I2C bus connections are the same pin positions on every Feather.

Note that the SCL and SDA connections on the FeatherWing have a 10k pullup resistor to 3.3V

 

More AF FeatherWing products from Adafruit and from Particle

 

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FeatherWing