Name: Adalogger FeatherWing - RTC + SD Add-on For All Feather Boards
Brand: Adafruit
SKU: 2922

Logical pinout · physical placement not verified

3.3VFeather bottom row, second from left
Feather 3.3V rail used to power the SD card and RTC when main power is available, per Adafruit Learn pinouts.
Type · PowerVoltage · 3.3V
GNDFeather bottom row, fourth from left
Ground return for the SD card and RTC, per Adafruit Learn pinouts.
Type · GroundVoltage · 0V
SCLTop right, left of SDA
I2C clock for the PCF8523 RTC; Adafruit states this pin has a 10K pull-up resistor to 3.3V.
Type · I2CVoltage · 3.3V pull-up
SDATop right, rightmost
I2C data for the PCF8523 RTC; Adafruit states this pin has a 10K pull-up resistor to 3.3V.
Type · I2CVoltage · 3.3V pull-up
INT
RTC interrupt or square-wave output; Adafruit notes this is open drain and requires a pull-up on the connected digital pin.
Type · SignalVoltage · open-drain output, external/internal pull-up required
SCKSPI group, starting from left
SPI clock from Feather to FeatherWing for the microSD card.
Type · SPI
MOSISPI group
SPI controller-out sensor-in data from Feather to FeatherWing for the microSD card.
Type · SPI
MISOSPI group
SPI controller-in sensor-out data from FeatherWing to Feather for the microSD card; Adafruit notes MISO is tri-stated whenever SD CS is pulled high.
Type · SPI
SDCS
microSD card SPI chip-select line. Adafruit lists Feather-family GPIO mappings and notes the jumper can be cut to use another pin.
Type · Signal

Pin	Position	Type	Function	Voltage
3.3V	Feather bottom row, second from left	Power	Feather 3.3V rail used to power the SD card and RTC when main power is available, per Adafruit Learn pinouts.	3.3V
GND	Feather bottom row, fourth from left	Ground	Ground return for the SD card and RTC, per Adafruit Learn pinouts.	0V
SCL	Top right, left of SDA	I2C	I2C clock for the PCF8523 RTC; Adafruit states this pin has a 10K pull-up resistor to 3.3V.	3.3V pull-up
SDA	Top right, rightmost	I2C	I2C data for the PCF8523 RTC; Adafruit states this pin has a 10K pull-up resistor to 3.3V.	3.3V pull-up
INT		Signal	RTC interrupt or square-wave output; Adafruit notes this is open drain and requires a pull-up on the connected digital pin.	open-drain output, external/internal pull-up required
SCK	SPI group, starting from left	SPI	SPI clock from Feather to FeatherWing for the microSD card.
MOSI	SPI group	SPI	SPI controller-out sensor-in data from Feather to FeatherWing for the microSD card.
MISO	SPI group	SPI	SPI controller-in sensor-out data from FeatherWing to Feather for the microSD card; Adafruit notes MISO is tri-stated whenever SD CS is pulled high.
SDCS		Signal	microSD card SPI chip-select line. Adafruit lists Feather-family GPIO mappings and notes the jumper can be cut to use another pin.

Logical pinout · physical placement not verified

Pin details

9 connections

3.3V
Feather 3.3V rail used to power the SD card and RTC when main power is available, per Adafruit Learn pinouts.
PowerVoltage · 3.3V
Feather bottom row, second from left
GND
Ground return for the SD card and RTC, per Adafruit Learn pinouts.
GroundVoltage · 0V
Feather bottom row, fourth from left
SCL
I2C clock for the PCF8523 RTC; Adafruit states this pin has a 10K pull-up resistor to 3.3V.
I2CVoltage · 3.3V pull-up
Top right, left of SDA
SDA
I2C data for the PCF8523 RTC; Adafruit states this pin has a 10K pull-up resistor to 3.3V.
I2CVoltage · 3.3V pull-up
Top right, rightmost
INT
RTC interrupt or square-wave output; Adafruit notes this is open drain and requires a pull-up on the connected digital pin.
SignalVoltage · open-drain output, external/internal pull-up required
SCK
SPI clock from Feather to FeatherWing for the microSD card.
SPI
SPI group, starting from left
MOSI
SPI controller-out sensor-in data from Feather to FeatherWing for the microSD card.
SPI
SPI group
MISO
SPI controller-in sensor-out data from FeatherWing to Feather for the microSD card; Adafruit notes MISO is tri-stated whenever SD CS is pulled high.
SPI
SPI group
SDCS
microSD card SPI chip-select line. Adafruit lists Feather-family GPIO mappings and notes the jumper can be cut to use another pin.
Signal

Start wiring

Shield

Confirm the data interface matches your host board.

Module pins: 3.3V, GND, SCL, SDA, INT, SCK, MOSI, MISO. Schematik maps them to your board in the app.

Add-ons

269 other options

About 270 add-ons across Pi HATs, Arduino shields, and FeatherWings. The same function — motor control, PoE, display — usually ships once per host connector family. Get the host board right first.

View all 269

Related groups

4 groups

Arduino

About 75 boards across every Arduino generation: 5V Uno/Mega/GIGA, 3.3V MKR and Portenta, plus DFRduino and Bluno compatibles. Confirm the voltage rail before stacking any shield.

Boards · Arduino boards · 77 parts

ESP32

Wi-Fi and Bluetooth on a single chip, in every shape from Espressif DevKitC to Adafruit Feathers with STEMMA QT, DFRobot FireBeetles tuned for battery life, and Seeed XIAOs under a thumbnail.

Boards · ESP32 boards · 159 parts

Other MCUs

Specialists: Teensy for high-clock audio and USB, Adafruit SAMD boards running CircuitPython or the Arduino IDE, proper STM32 eval kits, and the micro:bit classroom ecosystem. Schematik builds target ESP32, Arduino Uno, and Pico; come here when you have a specific reason to.

Boards · Other MCU boards · 229 parts

Pi Pico

The Raspberry Pi MCU line — Pico, Pico 2, and third-party boards on the same silicon — plus a deep bench of Pico-pinout displays, loggers, and radio modules that do nothing without a Pico plugged in.

Boards · Pico & RP2040 boards · 43 parts

Pinout