The SparkFun Portability Shield adds all the user interface bits needed to take a SparkFun development board into the field. A LiPo battery connector, charger, fuel gauge, and an on/off switch address your power needs. A friction-fit microSD connector allows for data logging. The 1.3" OLED and a five-way navigation switch provide an excellent user interface. Locking 0.1in. headers along the shield's edge make it easier to solder male pins in place.
I2C interfaces with the display, fuel gauge, and five-way navigation switch (GPIO expander PCA9554). SPI communicates with the microSD card. The power switch uses an ideal diode (LM66200) to disconnect the battery from the system for a sleep current of approximately 4μA.
The Portability Shield has been designed to be usable with any compatible main board, with the RTK Postcard being the first! It’s important to note that the RTK Postcard is designed to have full functionality when combined with the Portability Shield!
Features and Specifications
1.3" OLED Display
7-bit Unshifted Address: 0x3D (default), 0x3C
Input Voltage
5V via LiPo or VIN
Power Switch: ON/OFF
Five-Way D-Pad Navigation
MCP73831T Single Cell LiPo Charge IC
Charge Rate Set to ~500mA
MAX17048 Fuel Gauge
7-bit Unshifted Address: 0x36
AP2112K 3.3V Voltage Regulator
PCA9554 I2C 8 GPIO Expander
Interfaces with a 5-way navigation switch and microSD card detect
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