first commit

ATMEGA_EEPROM/ATMEGA_EEPROM.ino

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+  #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;
+}
+