The U3 IO Shield is designed to be mounted to the U3 via spacers and connected via the 8 pin GPIO connector on the U3.  It is meant as a development board to allow the U3 to interact with its surroundings.

KEY FEATURES

• 36 pins for GPIO/PWM/ADC
• Same footprint as the U3
• Versatile, general-purpose data acquisition and control module
• Direct connection to U3 via 8-pin GPIO connector
• Relatively large prototyping area
• GPIO/ADC/PWM and power pins on 0.1" strips
• Two 3-pin headers for small servo applications
• Access the HW SPI of Exynos-4412 CPU (compatible with U3 PCB revision 0.5)
• SPI Flash memory SST25WF020A
• Additional 10-pin connector for I2C/GPIO expansion

INCLUDES

• U3 IO shield board (U3 not included)
• 4x 20mm PCB spacer (plastic)
• 4x 11mm PCB spacer (metal) - Must be used between the U3 and IO Shield for proper grounding
• 4x 10mm PCB spacer (plastic)

LINKS

• Hardkernel product page - https://www.hardkernel.com/shop/u3-io-shield/

Warranty is valid for two weeks, starting upon date of receipt.