ElecFreaks GVS GPIO Shield for Raspberry Pi
Price in Singapore Dollars, including 7% GST of $0.82
RPI GPIO Shield turned Raspberry Pi GPIO into the normally-used Arduino I/O interface. The shield not only maintained most of Arduino UNO I/O interface, but also expanded IIC interface, UART TX/RX interface, and SPI interface, electronic bricks interface. RPI GPIO Shield inherited the Arduino UNO I/O all the features, which can be used to drive LED, sensors, LCD and other electronic modules and components.