Adafruit Data Logger Shield

Overview

The Adafruit Data Logger Shield rev. B features an NXP PCF8523 Real-Time Clock/Calendar with Battery Backup, an SD card interface, two user LEDs, and a prototyping area.

Adafruit Data Logger Shield (Credit: Adafruit)

Note

The older revision A of the Adafruit Data Logger Shield is not supported.

Pin Assignments

Shield Connector Pin	Function
D3	User LED1 (green) [1]
D4	User LED2 (red) [1]
D7	PCF8523 RTC INT1 [2]
D10	SD card SPI CS
D11	SD card SPI MOSI
D12	SD card SPI MISO
D13	SD card SPI SCK
SDA	PCF8523 RTC I2C SDA
SCL	PCF8523 RTC I2C SCL

[1] (1,2)

The user LEDs are not connected to D3 and D4 by default. Jumper or jumper wire connections must be established between the L1 and Digital I/O 3 pins for LED1 and L2 and Digital I/O 4 pins for LED2 if they are to be used.

[2]

The PCF8523 RTC INT1 interrupt output pin is not connected to D7 by default. A jumper wire connection must be established between the SQ pin and the Digital I/O 7 pin in order to use the RTC interrupt functionality (i.e. alarm callback, 1 pulse per second callback). The INT1 interrupt output is open-drain, but the shield definition enables an internal GPIO pull-up and thus no external pull-up resistor is needed.

Requirements

This shield can only be used with a board which provides a configuration for Arduino connectors and defines node aliases for SPI and GPIO interfaces (see Shields for more details).

Programming

Set -DSHIELD=adafruit_data_logger when you invoke west build. For example:

# From the root of the zephyr repository
west build -b frdm_k64f tests/drivers/rtc/rtc_api -- -DSHIELD=adafruit_data_logger