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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

    FAQ

    • If I need more digital and analog inputs and outputs than the Arduino provides, is this the correct board to purchase? Are the 16 additional I/Os capable of being PWM Digital and can they be Analog?
      Thank you. Dave

      No, this does not add any additional inputs or outputs. It simply gives you more physical connection options to the I/Os (more flexibility with the pins). If you need more I/Os, consider using a different type of Arduino (such as the Mega 2560).

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