GPIO_Shield_for_Arduino_V1.0_SKU__DFR0334-DFRobot

Introduction

An Arduino UNO 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.

Specification

• 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

Board Overview

Tutorial

PCA9555DB IIC Address

• Config PCA9555 IIC Address with A0A2 Jumper Caps (0x200x27)

Plug = 0
Unplug = 1

"D": represents digital signal
"A": represents analog signal

One of the biggest benefits of the I/O expansion shield is more power and GND pins, allowing you to connect more sensors.

* Green: digital signal
* Blue: analog signal
* Red: VCC
* Black: GND

• This is DFRobot's Gravity Interface. Digital and analog connections are easy to recognize and support most of DFRobot's I/O expansion shields and modules. Search "Gravity" in the DFRobot store to find compatible modules.

VCC Jumper Caps

There are two Jump caps, you can change the position of two caps for the different VCC power input. See the following schematic for details:

The middle pin is the shield VCC pin. If you connect caps on the left side, VCC pins get power from the shield external port; If you connect caps on the right side, VCC pins get power from the board 5V port;

This is suitable for some applications that require greater current.

Requirements

• Hardware

  • DFRduino UNO x1
  • GPIO Shield for Arduino x1
  • Button module
  • LED module

• Software

  • Arduino IDE Click to Download Arduino IDE from Arduino®

Connection Diagram

Sample Code

In this section, we will use an Arduino library written by nicoverduin Github Library. About Library installation.

#if defined(ARDUINO) && ARDUINO >= 100
#include "Arduino.h"
#else
#include "WProgram.h"
#endif

#include "clsPCA9555.h"
#include "Wire.h"


PCA9555 ioport(0x20);

void setup()
{
  ioport.pinMode(8, OUTPUT); //Set GPIOs pinMode LED
  ioport.pinMode(15, INPUT);  //Button
}

void loop()
{
  if (ioport.digitalRead(ED15) == LOW) {
    ioport.digitalWrite(8, LOW);                  //Turn off Led
  }

  if (ioport.digitalRead(ED15) == HIGH) {
    ioport.digitalWrite(8, HIGH);                 //Turn on Led
  }

}

FAQ

More Documents

Schematic
Layout
PCA9555 Datasheet
SVG files

FAQ

For any questions, advice or cool ideas to share, please visit the DFRobot Forum.