Objective Development Forums

Re: "Unknown USB Device" SOLVED

2013-01-25T12:48:59+02:00

please do send me arabindo045@gmail.com I am using ATMEGA8 with 16MHz crystal, 22p capacitor. 68 ohm with 3.6 zener diode, 1k ohm, 1M ohm resistors for D- & D+. I am getting "Unknown Device" always(and USB Device Not Recognized).

Statistics: Posted by Guest — Fri Jan 25, 2013 12:48 pm

Re: "Unknown USB Device" SOLVED

2012-06-05T08:32:36+02:00

Mail me. I will upload the files in a file-sharing site and post the link here.
Thanks for helping.

Statistics: Posted by lxkarthi — Tue Jun 05, 2012 8:32 am

Re: "Unknown USB Device" SOLVED

2012-06-04T04:43:31+02:00

Greetings,

I will email you both the drawing and the hex files I used. Please let me know if there is a way that I can post them in this forum, as I think that other interested users may benefit from them and I am not well versed in the use of forums.

Regards,

Statistics: Posted by RCamaran — Mon Jun 04, 2012 4:43 am

Re: "Unknown USB Device" SOLVED

2012-06-01T06:06:01+02:00

RCamaran wrote:lxkarthi,

I followed the design of the Metaboard for my project. I deviated from the original hardware by using a 470 Kohm for the D+ pull down to ground and by using two diodes in series with the +5 Volts supply from the USB connector. The last change allowed my board to work with the ATMega328p part. I used the hex files provided by Christian (Thanks a million) for both, the ATMega8 and the 328p. I have successfully used the Arduino IDE with both boards and multiples PCs and Macs without any issues.
I should thank all the smart people in this forum for sharing their ideas and knowledge.
If you are still having problems, I could send you hex files, drawings and fuse settings as well.

Regards

I could use all of this info as well. I am battling the same issues.
johnsonj at yahoo dawt com

Statistics: Posted by johnsonj — Fri Jun 01, 2012 6:06 am

Re: "Unknown USB Device" SOLVED

2012-05-31T15:55:13+02:00

lxkarthi,

I followed the design of the Metaboard for my project. I deviated from the original hardware by using a 470 Kohm for the D+ pull down to ground and by using two diodes in series with the +5 Volts supply from the USB connector. The last change allowed my board to work with the ATMega328p part. I used the hex files provided by Christian (Thanks a million) for both, the ATMega8 and the 328p. I have successfully used the Arduino IDE with both boards and multiples PCs and Macs without any issues.
I should thank all the smart people in this forum for sharing their ideas and knowledge.
If you are still having problems, I could send you hex files, drawings and fuse settings as well.

Regards

Thanks a lot for helping me.
Please send me exact schematic you used and hex files, fuse settings. What crystal did you use?
send to [ deleted ] com
Again, Thanks a lot.

Statistics: Posted by lxkarthi — Thu May 31, 2012 3:55 pm

Re: "Unknown USB Device" SOLVED

2012-05-31T04:31:01+02:00

lxkarthi,

I followed the design of the Metaboard for my project. I deviated from the original hardware by using a 470 Kohm for the D+ pull down to ground and by using two diodes in series with the +5 Volts supply from the USB connector. The last change allowed my board to work with the ATMega328p part. I used the hex files provided by Christian (Thanks a million) for both, the ATMega8 and the 328p. I have successfully used the Arduino IDE with both boards and multiples PCs and Macs without any issues.
I should thank all the smart people in this forum for sharing their ideas and knowledge.
If you are still having problems, I could send you hex files, drawings and fuse settings as well.

Regards

Statistics: Posted by RCamaran — Thu May 31, 2012 4:31 am

Re: "Unknown USB Device" SOLVED

2012-05-24T20:30:52+02:00

Hi RCamaran,
I am still out of luck with atmega8 usbasploader. can you help me?
Please mail me the Exact circuit diagram & hex files used..
My mail id is [ deleted ]

(My problem is i am getting USB device Not Recognised every time & shows as unknown device with uid, vid as 00. are you facing the same problem with 328?)
Thanks.

Statistics: Posted by lxkarthi — Thu May 24, 2012 8:30 pm

Re: "Unknown USB Device" SOLVED

2012-05-22T18:19:18+02:00

Greetings,

I have tried all suggestions to get my Metaboard to work with USBaspLoader to no avail. It works with an ATMega8 perfectly, but with the ATMega328p no dice. I've downloaded the firmware and used AVR Studio to compile with the suggestions made the 328p part won't work. I still get the "Unknown USB Device." I have used a breadboard and a nicely made two layer board and still no luck. I am able to burn any code into the 328p and make it work but I can not get the USBasploader to work.
Are there any other suggestions, besides going back to the ATMega8?

Statistics: Posted by RCamaran — Tue May 22, 2012 6:19 pm

Re: "Unknown USB Device" SOLVED

2012-05-21T10:01:06+02:00

After long experimentation time I found out that the best solution is to apply a reduced supply voltage to the AVR.Use any of the following ways as described here http://vusb.wikidot.com/hardware .Personally I have used two diodes in series and usbasp worked like a charm!
Hope that's helpful!
chears

Statistics: Posted by userkkk — Mon May 21, 2012 10:01 am

Re: "Unknown USB Device" SOLVED

2012-05-19T07:51:11+02:00

For USBaspLoader, I am using ATMEGA8 with 16MHz crystal, 22p capacitor. 68 ohm with 3.6 zener diode, 1k ohm, 1M ohm resistors for D- & D+. I am getting "Unknown Device" always(and USB Device Not Recognized). The Vendor & device id, i am getting in PC is 00, 00. But, in code, everything is fine. I made the circuit exactly as Metaboard circuit.
I tried the circuit in Breadboard & it did not work. So i thought, it might have Electromagnetic interference & soldered in PCB. In PCB also, it did not work.
Please Help..

Statistics: Posted by lxkarthi — Sat May 19, 2012 7:51 am