Skip to main content


This section allows you to view all Topics made by this member. Note that you can only see Topics made in areas you currently have access to.

Topics - znanev

Flash_Destroyer EEPROM tester / Free PCB build + EEPROM written to death :)
I started building the Flash Destroyer after I received the free PCB, but I had to put the project on hold due to some other high priority tasks and lack of some of the parts :)

The most expensive parts of this project were the 7-segment displays. I had a lot of different 7-segment displays in my junkbox, but most of them are not single digit. I didn't want to spend about £1 a digit for Kingbright's displays, so I headed to eBay for a quick search. I found these for about £3 shipped for 10 displays: ... 335bfba94c

The part number of these displays is SM42056-1K and according the datasheet they are suitable replacement. These displays are a little bit taller and wider then the Kingbright's, but eventually fitted nicely on the PCB :)

After the PCB was built, I plugged the poor 24AA01-I/P into the socket and turned the power on.

This picture I took the moment I turned the power on, but due to my slow reaction and the shutter lag, some 500 cycles elapsed in an instant:


Then I left the poor boy sitting there and counting, counting ...

After 13 days elapsed, the counter was still ticking and the EEPROM survived over 7 million writes. I wanted to capture the precious moment of the display showing all 7s, but again I had no luck:


Event though I put the camera in burst mode, the speed was not sufficient to capture the exact moment. The photo before this one captured 7777762.

Then again I left the destroyer doing its job.

After 19 days since the start, I found the poor EEPROM had died:


I'm not sure where I got the firmware source from, but it seems it was an older version, because after the 10 million writes the display didn't show a dot but reverted to all 0s again. So in fact the total number of the writes the chip survived was about 11.4 million.


After the EEPROM had died, I played a bit with the sources and made the display capable of showing all alhpa-numeric characters (some were not that readable, but it is hard to represent some letters with only 7 segments :)

Now I'm working on re-purposing the Flash Destroyer into a digital thermometer. I will post my success (if any) here soon.
DIY Life projects / Free PCB build
About a year ago I received a free PCB and assembled the circuit. Now it works nicely as mood lamp and I decided to share the result.

First, here is a photo of the circuit sitting in a plastic box from business cards:


The first version of the "LED pod" I built for proof of concept. It looks really ugly, but did its job:


The LEDs came originally in crystal clear packages, so I sanded them with some fine sandpaper in order to make them "diffused" to better blend the different colours. I used 4 Red, 4 Green and 4 Blue LEDs for this proof of concept board.

After a while I decided to make the LED pod a little bit brighter, so I bought from eBay some PCBs like this one:


This took me about half a day to build due to the time required to "diffuse" all 24 LEDs :)

From the proof of concept board I noticed the red colour is noticeably dimmer compared to the other two, so this time I just doubled the red LEDs and the new LED pod now contains 6 green, 6 blue and 12 red LEDs.

And here is how the finished mood lamp looks now:


The globe is from an Ikea lamp I bought cheaply (something like £5) and blends the LED colours nicely.
Bus Pirate Support / Serial to I2C - is it possible ?
Hi all!

Sorry for the noob question, but I am interested if the following scenario is possible:

Control the Bus Pirate through serial interface (using 3.3V RX/TX only) instead of the USB port.

I know the USB port actually emulates a serial connection, but you need a PC for that. What I need is connect the Bus Pirate to a linux-capable router having serial ports only. The router will issue / receive data using its serial interface to control I2C devices.

Even if it is not possible to do it with the firmware only, I am comfortable to modify the board (just a bit :). Is there an easy way to "switch off" the FTDI chip and connect the Bus Pirate board to external 5V power supply and directly to TX / RX connectors of the router (3.3V)?

Many thanks!