1. Serial Eeprom Programmer Schematic
2. Cheap Eeprom Programmer

Greetings, all Total newbie here. I have searched on this forum for a while now, looking at all the interesting projects. But I have either not found what I'm looking for, or failed to recognise it when I saw it. A lot of modern microcontrollers – such as the ATmega328 – contain some built-in EEPROM, but that doesn't mean that you can't add more! Serial EEPROM devices like the Microchip 24-series EEPROM allow you to add more memory to any device that can speak I²C. Today we're going to learn how to read and write serial EEPROM devices using Arduino.

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The very first batch of boards (5) have an FTDI EEPROM that doesn't seem to work under linux properly.

I discovered that libftdi comes with a couple utilities that can read and write the FTDI EEPROM.

I cloned this repository and followed the build instructions here.

When I did the make, it failed part way through, but it was after it had built the ftdi_eeprom utility, so I never bothered to investigate the build failure.

You should find build/ftdi_eeprom/ftdi_eeprom.

You can read the EEPROM by doing (assumes you're in the build directory):

and then you can update the EEPROM by doing:

After updating the EEPROM, you should unplug and replug the board.

You can then verify the contents by re-reading the eeprom:

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Expansion board interfaces the programmer with the microcontroller. The different series of microcontroller is having different pin and configuration for programming. It gives the advantage of easy to program the microcontroller to the user.

Expansion board can be easily made using the perf board or in breadboard, because it is very simple circuit. I made the expansion board using perf board. For different series of microcontrollers, different expansion board is used. In 3.3V expansion (LVICP) board a 5V to 3.3V,a voltage regulator such as LM1117 or similar is need.

Fig 5 and Fig 6 shows the expansion boards and circuit diagram for different series of microcontrollers. (A clear circuit diagram is provided in the attachment.)

Note: A 3.3V device should only be programmed using 3.3V expansion board, otherwise a permanent damage may occur.

Serial Eeprom Programmer Schematic

3.3V device are: PIC12F1xxx, 16F1xxx, 18FxxJxx, 18FxxKxx, 24Fxxxx, 24Hxxx, dsPIC33xxx.

Cheap Eeprom Programmer

In which some of them is having 5V variant. If you need to program at 5V you can select the option “Don’t require LV boards”. Also don’t put any 24F-33F in the 30F socket which works at 5V.