Objective Development Forums

V-USB • Re: ATmega328p with internal RC oscillator?

2019-02-04T20:04:47+02:00

Hi...I used it before on an ATmega8 with heavy serial port needs... No problems whatsoever. This was almost ten years ago too, not sure if the internal oscillator in AVRs has changed much lately.You can now use the oscillator pins as a RTC and save the external chip.
I'm testing it out on an old ATmega16, and maybe create a library if it works out ok.

Statistics: Posted by AudyIltis — Mon Feb 04, 2019 8:04 pm

V-USB • Re: ATmega328p with internal RC oscillator?

2019-01-25T03:57:38+02:00

AHorneffer wrote:Hi

lgberro wrote:I am trying to make atmega328pb run with internal oscillator at 12.8MHz. We could share our achievements.

A bit late, but just FYI: I gave up trying to use VUSB on the ATmega328p with the internal oscillator.
I use it with 12MHz or 16MHz crystals.

and I did make it work with internal oscillator at 12.8 MHz...

Statistics: Posted by lgberro — Fri Jan 25, 2019 3:57 am

V-USB • Re: V-USB with ATTINY412

2019-01-25T03:53:12+02:00

I plan to make it (with the similar ATtiny1614) in the next months.

Statistics: Posted by lgberro — Fri Jan 25, 2019 3:53 am

V-USB • Re: ubuntu virtual machine can't recognize my device

2018-12-30T21:32:15+02:00

Firstly, you should install the extension pack for the VBox.
Second, open the VBox with root privilege.

Statistics: Posted by mostafayasin — Sun Dec 30, 2018 9:32 pm

V-USB • V-USB with ATTINY412

2018-12-24T15:54:02+02:00

Hi there
I want to build a new product with V-USB and want to use the (relative) new ATTINY412 chip. Does this chip works together with the V-USB library?

Statistics: Posted by Guest — Mon Dec 24, 2018 3:54 pm

V-USB • Re: V-USB and OTG feature

2018-12-14T14:41:54+02:00

If you are looking to use the v-usb as a host (OTG) then no. That's not going to happen. The v-usb hardly keeps up with usb 1.1 high speed. And it does so at the cutting edge. FYI: v-usb has not seen growth in some time. It has no plans to evolve. Mainly because most chips now have usb build in to them.

Statistics: Posted by ulao — Fri Dec 14, 2018 2:41 pm

V-USB • V-USB and OTG feature

2018-12-13T13:17:38+02:00

Dear,

I wonder if it is possible to enable OTB feature with the V-USB library/firmware ?
If not : it is foreseen in a future evolution ?

Thank you for your support.

Statistics: Posted by eclisia — Thu Dec 13, 2018 1:17 pm

V-USB • V-USB / ATtiny85 Receive/send rfid tag read

2018-12-09T23:28:07+02:00

Hi
My project is rfid reading. using low cost M302 readers (2 or more). The readers use HID and place the reading of tag data into the position of cursor focus on document on ATtiny85. There is one reader for each area/location
As the readers do not have ID I wan to read tag, add an ID number to the read, and then forward to open Excel spreadsheet on PC. I will need separate ATtiny for each reader, and therefore an ID of its own.
Use V-USB ?

Please comment on my thoughts-

Plug usb reader into ATtiny85 with (usb breakout?)
create or open . txt file on ATtiny85 (create only the first time)
Set cursor to focus on .txt file
Read a tag on rfid reader. The HID on usb places the read from tag, into the focus cursor position in .txt file.?No software needed in .txt file?
Set an id in software for this ATtiny85 only. (as a variable?)
Add as a prefix, the ID number, to reader data into the .txt file
Using keyboard reader? to send combined data to Excel spreadsheet ...readings.xls
Once data sent last data sent is removed from .txt file, ready for next read. (about 1 second)
Return to set cursor focus

ATtiny85 will be powered by battery.

Would like to do with the minimum of software.

Excel spreadsheet - receives data from usb port from usb hub - ATtiny85 plugged into say 4 way hub (with say 3 other ATtiny85 into hub) - usb reader plugged into each ATtiny85.
As each reader is used, its individual ID prefixed to the tag read and placed in Excel. Excel can then manipulate by location/area as required.

I am noobie and need some direction for this project.
Thanks
Charles Harris

Statistics: Posted by sswcharlie — Sun Dec 09, 2018 11:28 pm

V-USB • Cautionary tale (Re: 1k5 k pull-up on D-)

2018-12-06T14:08:58+02:00

Hi blargg

Thanks for the explanation, I now understand the problems I had.
Maybe as a cautionary tale for others (Even though most of us probably only read that when it is too late, like I did): when choosing the zener diodes for my latest project I didn't pay attention to the power rating of the diodes. On my breadboard where I used a 1k pull-up resistor (don't ask, I guess I thought "meh the computer shouldn't be so picky") they worked fine. But on the PCB where I used a 1.5k pull-up it didn't work. It turned out that they are only rated for the 3.6V at 69mA. So with a 1.5K pull-up I only had about 1.6V over the zeners and with the 1k about 2.4V. Still below specs, but works well enough with my computer.

Statistics: Posted by AHorneffer — Thu Dec 06, 2018 2:08 pm

V-USB • Re: ATmega328p with internal RC oscillator?

2018-12-06T13:39:33+02:00

lgberro wrote:I am trying to make atmega328pb run with internal oscillator at 12.8MHz. We could share our achievements.

A bit late, but just FYI: I gave up trying to use VUSB on the ATmega328p with the internal oscillator.
I use it with 12MHz or 16MHz crystals.

Statistics: Posted by AHorneffer — Thu Dec 06, 2018 1:39 pm