IIC_to_GPIO_Shield_V2.0_SKU__DFR0013

IIC to GPIO Shield V2.0

Introduction

Having troubles with inadequate digital I/O when using Arduino with robots or interactive media? This IIC to GPIO shield helps you solve the problem, Arduino has only two data lines (SCL-Analog PIN5, SDA-Analog PIN4) and IIC can transfer I / O module communication, to convert the 16 digital IO ports, read-write. 8 simultaneous parallel modules, each module can be set to address.

Specification

Module power supply: +5 V
16 Digital I/O port comes with internal pull-up
Can be set to eight addresses (address range of 0x20 ~ 0x27)
8 modules simultaneously in parallel (IIC bus need to pull together)
Module Size: 56x53mm (2.21x2.08 in)

Board Overview

IIC to GPIO Shield V2.0

Plug = 0 Unplug = 1


A2	A1	A0	IIC Address
0	0	0	0x20 (Default)
0	0	1	0x21
0	1	0	0x22
0	1	1	0x23
1	0	0	0x24
1	0	1	0x25
1	1	1	0x26
1	1	1	0x27

Tutorial

Requirements

Hardware
- DFRduino UNO x1
- IIC to GPIO Shield V2.0 x1
- Button module
- LED module

Software
- Arduino IDE V1.6.5 Click to Download Arduino IDE from Arduino®

Connection Diagram

IIC to GPIO Shield V2.0

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(7, OUTPUT); //Set GPIOs pinMode LED
  ioport.pinMode(8, INPUT);  //Button
}

void loop()
{
  if (ioport.digitalRead(ED8) == LOW) {
    ioport.digitalWrite(7, LOW);                  //Turn off Led
  }

  if (ioport.digitalRead(ED8) == HIGH) {
    ioport.digitalWrite(7, HIGH);                 //Turn on Led
  }

}