Raspberry Pi I2C-IO Expand Module(English)

Description

This module is designed specifically for expand the GPIO of Raspberry Pi, this module can effectively solve the problem of less of RaspberryPi's IO use. It use PCF8574 chip to expand 8 Bidirectional IOs. The module connection to the Raspberry Pi through I2C interface. There are 8 I2C address in the module and user can choose one of them through setup the “ADDR” jumper. User also can choose 5V or 3.3V electric level. Module with isolation protection, can effectively prevent external high voltage damage to the Raspberry Pi. Multiple module can cascade.

Product Features

• 8 Bidirectional IO
• 8 I2C-address
• Isolation protection
• Use wiringPi API , sample code
• 100 kHz I2C-bus interface (Standard-mode I2C-bus)

Technical Details

Typical Application

• LED signs and displays
• Key pads
• Instrumentation and test measurement
• Driver numeric display
• Drive the lattice screen

Overview

mounted on Raspberry Pi

in the night

product scale

schematic

Learn

• If it's the first time for you to use Raspberry Pi, please make sure the I2C interface is enabled. This page will show you how to enable the I2C interface. http://www.52pi.net/forum.php?mod=viewthread&tid=1363&highlight=rtc
• Type sudo apt-get install i2c-tools to install necessary component

• If the steps above are done,next typesudo vim.tiny /etc/modulesto modify modules file just like the following

i2c-bcm2708
i2c-dev

• typesudo i2cdetect -y -a 1to detect the module is work on raspberry Pi

• this module is detected on address 0x27,then we load the demo code and compile it.

• type sudo ./a.out,with a voltmeter,you will see the pin level change

demo code

示例代码说明

#include <wiringPi.h>
#include <pcf8574.h>
#include <stdio.h>
int main()
{
 int i;
 pcf8574Setup(100,0x27);
 for(i=0;i<8;i++) pinMode(100+i,OUTPUT);
while(1)
 {
  i = 0;
  for(i=0;i<=8;i++)
   {
   printf("Current LED = %d\n",100+i);
   digitalWrite((100+i),HIGH);
   delay(500);
   digitalWrite((100+i),0);
   delay(500);
    }
  }
}

购买链接

附件

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