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Arduino interfacing, circuits tutorials with code and ebooks, Step by step guides for all sensor modules used for arduino. ESP8266 Internal EEPROM Programming. December 16, 2016 IoT Tutorials ESP8266. Now let’s read data from EEPROM and show it on serial monitor. You can combine these two programs as per your need.

1. Arduino Eeprom Default Value
2. Arduino Eeprom Library
3. I2c Eeprom Programmer

1. In Arduino, you can read and write from the EEPROM easily using the EEPROM library. How many bytes can you store? Each EEPROM position can save one byte, which means you can only store 8-bit numbers, which includes integer values between 0 and 255.
2. To these requirements, EEPROM seems a convenient and economical solution. This article makes an introduction to EEPROM modules, how to wire them, understand them and effectively take advantage of them in our programs with an Arduino or any compatible board, like the ConnDuino that is discussed through this site.
3. We’ll show you how to use a couple of the built-in Arduino functions in the example below. This program reads a temperature sensor and stores the value in the EEPROM once every two seconds. One button prints the non-empty part of the EEPROM over serial, while another button erases the EEPROM.

Explanation of program:

On power up or reset the 'setup' is executed once, setting up the hardware and writing the text message 'Arduino' to the EEPROM. Then the 'loop' section will run over and over. Whenever sw0 is pressed the text message 'Arduino' is read from the EEPROM and sent via the serial port to a computer running for example Hyper Terminal. This demonstrates the use of the Wire.h library, serial ports, and an external switch tied to an input.

For the basic structure of an Arduino program see page 7 of Arduino Programming Notebook by Brian Evans

For information on setting up switches and pull ups on the Arduino see pages 4-6 on Arduino Projects by Tod Kurt

24LC08 Demo with the ATMEGA128
This is an 8-pin DIP serial EEPROM. It will store 1024 bytes. (0x3FF)
It uses I2C or 'two wire' interface.
See 24LC08 Serial EEPROM

Pin designations for the 24LC08:
Pins 1, 2, 3 if tied to VCC (5 volts) address = 0x54. If tied to VSS 0x50. Only two can be used in a single circuit.
Pin 4 VSS or ground.
Pin 5 SDA or serial data. Tied to Arduino analog pin 4.
Pin 6 SCL or serial clock. Tied to Arduino analog pin 5.
Pin 7 WP or write protect. VCC disables write, VSS enables write.
Pin 8 VCC or +5 volts.

Arduino code for this project: arduino_24lc08.txt.

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I am using an Arduino Uno, and I use the EEPROM to store some presets. It works fine. But, when I reprogram the Arduino, the EEPROM gets wiped out. Is there a way to prevent this, and have the EEPROM not change after the Arduino is programmed?

I am using a USBtinyISP programmer.

Thank you very much for your help, and advance.

Here is the verbose result of my programming:

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1 Answer

You can change the fuses for Atmega328 to preserve EEPROM during chip erase (for ISP programming). Basically, if you are using USBTiny connected to the UNO by 3x2 pin header, you are using ISP programming. Which means chip erase erases also EEPROM if fuse EESAVE is 1 (unprogrammed).

Uploading over the Arduino bootloader (it means you have the UNO connected directly into the computer and there is no other device like USBTiny). The EEPROM should be preserved then.

Arduino Eeprom Default Value

Arduino Eeprom Library

I2c Eeprom Programmer

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