(SKU:DFR0117)EEPROM数据存储模块
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概述
Arduino自身带了少量的数据存储空间,但想存大量数据怎么办?这里我们推荐EEPROM数据存储模块。EEPROM存储模块使用I2C总线来与Arduino进行连接,并且采用可插拔的芯片,用户可以根据情况更换存储容量大的芯片。与interface shield接口扩展板和I2C专用连接线配合使用,即插即用。EEPROM储模块上使用的是24C系列的EEPROM芯片,容量为256Kbit,即32K字节。
Specification
- 电压:+5V
- 电流:<10mA
- 接口:IIC/I2C/TWI
- 容量:32k bytes
- 重量:10g
设置
- 地址:0x50的
- 从0x50-0x57通过的swither调整
地址真相表
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); }