#include <Wire.h>
  
  #define eeprom 0x50 //defines the base address of the EEPROM
  
void setup(void){
  Wire.begin(); //creates a Wire object
  Serial.begin(9600);
  
  unsigned int address = 0; //first address of the EEPROM
  Serial.println("We write the zip code 22222, a zip code in Arlington, Virginia!");
  for(address = 0; address< 5; address++)
  writeEEPROM(eeprom, address, '2'); // Writes 22222 to the EEPROM
  
  for(address = 0; address< 5; address++) {
  Serial.print(readEEPROM(eeprom, address), HEX);
  }
}
  
void loop(){
  //there's nothing in the loop() function because we don't want the arduino to repeatedly write the same thing to the EEPROM over and over. We just want a one-time write, so the loop() function is avoided with EEPROMs.
}
  
  //defines the writeEEPROM function
void writeEEPROM(int deviceaddress, unsigned int eeaddress, byte data ) {
  Wire.beginTransmission(deviceaddress);
  Wire.write((int)(eeaddress >> 8)); //writes the MSB
  Wire.write((int)(eeaddress & 0xFF)); //writes the LSB
  Wire.write(data);
  Wire.endTransmission();
}
  
  //defines the readEEPROM function
  byte readEEPROM(int deviceaddress, unsigned int eeaddress ) {
  byte rdata = 0xFF;
  Wire.beginTransmission(deviceaddress);
  Wire.write((int)(eeaddress >> 8)); //writes the MSB
  Wire.write((int)(eeaddress & 0xFF)); //writes the LSB
  Wire.endTransmission();
  Wire.requestFrom(deviceaddress,1);
  if (Wire.available())
  rdata = Wire.read();
  return rdata;
}