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Gravity: PCA9555DB GPIO Expansion Board

SKU: DFR0334

An [**Arduino UNO**](https://www.dfrobot.com/product-610.html) has a limited number of GPIO pins - but what if it is not enough? The GPIO expansion shield specifically designed for Arduino UNO-type boards. This shield greatly expands the GPIO resources to 36 pins in total, including 14 digital pins, 6 analog pins and 16 I2C pins. In addition digital and analog pins include the DFRobot "Gravity" interface, giving you in-line power and ground pins and saving you having to connect millions of jumper wires for a single sensor.

Overhead shot of Arduino GPIO Shield connected to microcontroller board showing I/O expansion components.-DFRobot product sku:DFR0334 image.
  • Docs
  • Tech Specs

    • Specification

    Parameter Details
    Arduino Digital Pins 14, D0 - D13
    Arduino Analog Pins 6, A0 ~ A5
    IIC - GPIO Digital Pins 16, P0.0 ~ P0.7; P1.0 ~ P1.7
    IIC Port 1
    UART Port 1
    Power Supply 5 VDC / External Power Supply (jump cap switch)
    Reset Button 1
    Dimensions 53.34 x 54.48 mm / 2.1 x 2.14 inches
    Weight 30g

    Pinout

    GPIO Shield for Arduino V1.0

    Num Name Description
    1 External Power 5 VDC
    2 VCC Jumper Caps Choose to power from board or shield external power
    3 PCA9555DB IIC Address Setting Set PCA9555DB I2C Address 0x20~0x27
    4 Arduino Digital I/O Pins D0~D13
    5 Arduino Analog input Pins A0~A5
    6 IIC to GPIO Digital Pins P0.0~P0.7; P1.0~P1.7
    7 IIC Port IIC Communication
    8 UART Port UART Communication

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