AT24C02 EEPROM Memory

Module Source

Purchase Link: https://detail.tmall.com/item.htm?abbucket=0&id=698591628199&ns=1&spm=a21n57.1.0.0.7edf523co7QMUt
Baidu Netdisk Download Link:
https://pan.baidu.com/s/1MotE_ffwvoBPeFRveZ6rIw
Password:6666

Specifications

Operating Voltage: 1.8V-5.5V

Operating Current: Maximum 3mA

Communication Interface: I2C

Memory: 2048 bits

Clock Speed: Maximum 1000kHz at 5V, 400kHz for other voltages

Hardware Connection

• VCC: Connect to the 5V pin of the development board.
• GND: Connect to the GND pin of the development board.
• SDA (Serial Data Line): Connect to the A4 (SDA) pin of the development board.
• SCL (Serial Clock Line): Connect to the A5 (SCL) pin of the development board.

Usage Method

/******************************************************************************
  * Test Hardware: LCSC ColorEasyDuino Development Board
  * Version Number: V1.0
  * Modified By: www.lckfb.com
  * Modification Date: April 18, 2024
  * Function Overview:
  *****************************************************************************
  * Open-source development board hardware and software information and related projects hardware and software information on official website
  * Development board official website: www.lckfb.com
  * Technical support resident forum, any technical problems are welcome at any time to exchange learning
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  * We focus on cultivating Chinese engineers rather than profiting from board sales.
******************************************************************************/
#include <Wire.h>

#define EEPROM_ADDRESS 0x50  // AT24C02的I2C地址

void setup() {
  Wire.begin(); // 初始化I2C通信
  Serial.begin(9600); // 开始串行通信以观察结果

  writeEEPROM(EEPROM_ADDRESS, 0, 123); // 将数字123写入AT24C02的地址0
  delay(100); // 短暂延时以确保写入完成
  int value = readEEPROM(EEPROM_ADDRESS, 0);  // 从地址0读取值

  Serial.print("Read value: ");
  Serial.println(value); // 打印读取的值
}

void loop() {
  // 在这个例子中不执行操作
}

void writeEEPROM(int deviceaddress, unsigned char eeaddress, byte data ) {
  Wire.beginTransmission(deviceaddress);
  Wire.write(eeaddress);   // EEPROM字节
  Wire.write(data);
  Wire.endTransmission();

  delay(5); // 等待写入完成
}

byte readEEPROM(int deviceaddress, unsigned char eeaddress ) {
  byte rdata = 0xFF;

  Wire.beginTransmission(deviceaddress);
  Wire.write(eeaddress);   // EEPROM字节
  Wire.endTransmission();

  Wire.requestFrom(deviceaddress, 1); // 请求1字节的数据

  if (Wire.available()) rdata = Wire.read();

  return rdata;
}

Usage Testing