i want to buy is device,

please reply

http://www.vk2zay.net/article/31

Zeljko,

Great to hear you got it working.

The timing was all a bit of a hack, doesn't surprise me you needed to remove the usleep() to get it working.

Regards,

Alan

At first, I was getting "control byte 1 was not ACKed" error when trying to read or write an EEPROM.

But when I un-commented usleep(5) line in i2c.c, everything started to work fine.

Dave,

No, those devices are SPI not I2C.

They could be interfaced to the parallel port fairly trivially however.

Regards,

Alan

Hi,

Does this supports AT25F1024 (Atmel) and 25P10VP (ST)?

Thank you

You are right. it was a supply problem and it was the diode that caused it. So i removed it completely and it works ok. As for the software it's just a test program but i can send you the source and executable to publish it in your website for people using Delphi as a programmers language.

P.S. The delay is not needed at least with my 24c256 EEPROM.

Sounds like it might be a power supply problem with the supply rail sagging as the chip pulls more current on write. Have you tried giving it a dedicated 5 Volt supply from an external regulated source instead of stealing juice from the port lines?

Once you get it working other people might like the Win32 software for the device. If you are planning on publishing it on the web I'm happy to link to the site.

I made the circuit on a raster and it works ok.

I also ported your code to delphi in win32.

One problem is that i cannot write more than 40 bytes. After that an error occurs. If i try to write again then another 40 bytes are written.

I dont have that problem when reading.

Do you have any idea on what the problem might be?

Also if i increase the delay fewer bytes are written.

For the supply diode I used a 1N4148 which is fine for the currents involved. Any similar small signal diode would work, or even a rectifier like the 1N400x series.

The LEDs are generic devices too, nothing special.

Quick question, any special part or specs needed for the diodes? Generally, what can be used for them?