I2C EEPROM programmer

Projects Programming
27

First, run this i2c scanner program, and verify that you can see the address of the eeprom and it is what the code expects which is 0x50.

I am very confused by the output, which is only 15 bytes wide. Even with the wrong address or no eeprom connected I see output 16 bytes wide on the printout. What baud rate setting do you have on the monitor when you run the code in #14?

EDIT: Are you trying to read/write a new and unused 24LC128 eeprom? How is the WP(write protect) pin connected?

// I2C Scanner
// Written by Nick Gammon
// Date: 20th April 2011

#include <Wire.h>

void setup() {
  Serial.begin (115200);

  // Leonardo: wait for serial port to connect
  while (!Serial) 
    {
    }

  Serial.println ();
  Serial.println ("I2C scanner. Scanning ...");
  byte count = 0;
  
  Wire.begin();
  for (byte i = 8; i < 120; i++)
  {
    Wire.beginTransmission (i);
    if (Wire.endTransmission () == 0)
      {
      Serial.print ("Found address: ");
      Serial.print (i, DEC);
      Serial.print (" (0x");
      Serial.print (i, HEX);
      Serial.println (")");
      count++;
      delay (1);  // maybe unneeded?
      } // end of good response
  } // end of for loop
  Serial.println ("Done.");
  Serial.print ("Found ");
  Serial.print (count, DEC);
  Serial.println (" device(s).");
}  // end of setup

void loop() {}