{"title":"Portability Shield for SparkFun Development Boards","handle":"sparkfun-portability-shield","url":"/products/sparkfun-portability-shield","description":"Add the user interface and power features needed to take a compatible SparkFun development board into the field. This shield brings together battery power, charging, storage and controls in a compact add-on board.Power is handled with a LiPo battery connector, charger, fuel gauge and an on/off switch. A friction-fit microSD connector supports data logging, while the 1.3in. OLED and five-way navigation switch provide a simple on-board user interface. Locking 0.1in. headers along the shield's edge help make it easier to solder male pins in place.I2C is used for the display, fuel gauge and five-way navigation switch via the PCA9554 GPIO expander. SPI is used for the microSD card. The power switch uses an ideal diode, the LM66200, to disconnect the battery from the system for a sleep current of approximately 4μA.The shield is designed for use with compatible main boards, with the RTK Postcard being the first supported board. The RTK Postcard is designed to have full functionality when combined with this shield. Supporting documentation includes schematic, KiCad files, board dimensions, 3D STEP file, hookup guide and hardware GitHub repository.Features:Field-ready power: LiPo battery connector, charger, fuel gauge and on/off switchDisplay: 1.3in. OLED DisplayNavigation: Five-Way D-Pad NavigationData logging: microSD Socket Friction FitHeaders: Locking 0.1in. headers along the shield's edge make it easier to solder male pins in placeI2C interface: Used to interface with the display, fuel gauge and five-way navigation switchSPI interface: Used to communicate with the microSD cardCompatibility: Designed to be usable with any compatible main board, with the RTK Postcard being the firstSpecifications:OLED Display: 1.3in.OLED 7-bit Unshifted Address: 0x3D (default), 0x3CInput Voltage: 5V via LiPo or VINPower Switch: ON/OFFLiPo Charge IC: MCP73831T Single Cell LiPo Charge ICCharge Rate: Set to ~500mAFuel Gauge: MAX17048 Fuel GaugeFuel Gauge 7-bit Unshifted Address: 0x36Voltage Regulator: AP2112K 3.3V Voltage RegulatorGPIO Expander: PCA9554 I2C 8 GPIO ExpanderGPIO Expander Interface: Interfaces with 5-way navigation switch and microSD card detectGPIO Expander 7-bit Unshifted Address: 0x20microSD Socket: Friction FitPull-Up Resistors: 2.2kΩ Pull-Up ResistorsJumper D/C: OLED I2C AddressJumper I2C: Pull-Up ResistorsJumper PWR: Power LEDJumper CHG: Charge Status LEDPower Switch Ideal Diode: LM66200Sleep Current: approximately 4μABoard Dimensions: 43mm x 43mm","vendor":"SparkFun","product_type":"Development Board Shield","in_stock":true,"options":[],"variants":[{"id":15726,"title":"Default Title","sku":"SF-DEV-27510","mpn":"DEV-27510","price":97.9,"on_sale":false,"in_stock":true,"available_quantity":49}]}