概述

Arduion自身带了少量的数据存储空间，像UNO只有32K，但是如果你想要存储大量数据的话，其存储空间肯定是不够用的，因此我们就需要加入EEPROM模块来增大存储空间。EEPROM存储模块使用I2C总线来与Arduion进行连接，此模块所采用的是Microchip公司所生产的24LC256芯片，其存储空间为256Kbit，即32kB字节；模块可以和interface shield接口扩展板和I2C专用连接线配合使用，支持热插拔。

技术规格

• 供电电压：2.5 ~5.5V
• 写最大电流：3mA at 5.5V
• 读最大电流：400uA at 5.5V
• 待机电流：100nA at 5.5V
• 接口：Gravity-I2C
• 容量：32k bytes
• 模块尺寸：30.00*21.05（mm）
• 安装孔直径：3.5mm
• 工作温度：-40℃~+125℃
• 重量：10g

引脚定义

模块地址真值表

与Arduion接线图

示例代码

/*
  *  Use the I2C bus with EEPROM 24LC64
  *  Sketch:    eeprom.pde
  *
  *  Author: hkhijhe
  *  Date: 01/10/2010
  *
  *
  */

  #include <Wire.h> //I2C library



  void i2c_eeprom_write_byte( int deviceaddress, unsigned int eeaddress, byte data ) {
    int rdata = data;
    Wire.beginTransmission(deviceaddress);
    Wire.write((int)(eeaddress >> 8)); // MSB
    Wire.write((int)(eeaddress & 0xFF)); // LSB
    Wire.write(rdata);
    Wire.endTransmission();
  }

  // WARNING: address is a page address, 6-bit end will wrap around
  // also, data can be maximum of about 30 bytes, because the Wire library has a buffer of 32 bytes
  void i2c_eeprom_write_page( int deviceaddress, unsigned int eeaddresspage, byte* data, byte length ) {
    Wire.beginTransmission(deviceaddress);
    Wire.write((int)(eeaddresspage >> 8)); // MSB
    Wire.write((int)(eeaddresspage & 0xFF)); // LSB
    byte c;
    for ( c = 0; c < length; c++)
      Wire.write(data[c]);
    Wire.endTransmission();
  }

  byte i2c_eeprom_read_byte( int deviceaddress, unsigned int eeaddress ) {
    byte rdata = 0xFF;
    Wire.beginTransmission(deviceaddress);
    Wire.write((int)(eeaddress >> 8)); // MSB
    Wire.write((int)(eeaddress & 0xFF)); // LSB
    Wire.endTransmission();
    Wire.requestFrom(deviceaddress,1);
    if (Wire.available()) rdata = Wire.read();
    return rdata;
  }

  // maybe let's not read more than 30 or 32 bytes at a time!
  void i2c_eeprom_read_buffer( int deviceaddress, unsigned int eeaddress, byte *buffer, int length ) {
    Wire.beginTransmission(deviceaddress);
    Wire.write((int)(eeaddress >> 8)); // MSB
    Wire.write((int)(eeaddress & 0xFF)); // LSB
    Wire.endTransmission();
    Wire.requestFrom(deviceaddress,length);
    int c = 0;
    for ( c = 0; c < length; c++ )
      if (Wire.available()) buffer[c] = Wire.read();
  }




  void setup()
  {
    char somedata[] = "this is data from the eeprom"; // data to write
    Wire.begin(); // initialise the connection
    Serial.begin(9600);
    i2c_eeprom_write_page(0x50, 0, (byte *)somedata, sizeof(somedata)); // write to EEPROM

    delay(10); //add a small delay

    Serial.println("Memory written");
  }

  void loop()
  {
    int addr=0; //first address
    byte b = i2c_eeprom_read_byte(0x50, 0); // access the first address from the memory

    while (b!=0)
    {
      Serial.print((char)b); //print content to serial port
      addr++; //increase address
      b = i2c_eeprom_read_byte(0x50, addr); //access an address from the memory
    }
    Serial.println(" ");
    delay(2000);

  }

例程测试结果

常见问题

还没有客户对此产品有任何问题，欢迎通过qq或者论坛联系我们！

更多问题及有趣的应用，可以 访问论坛 进行查阅或发帖。

更多

• 旧版本维库的链接 (SKU:DFR0117)EEPROM数据存储模块
• 模块芯片数据手册 Microchip 24LC256芯片数据手册下载
• 原理图下载

购买 Gravity-I2C EEPROM Data Storage Module For Arduino (SKU:DFR0117)