Isn't the USB signal differential? I understand that this means that the
signal is encoded by the difference between the two data pins (which are
connected by a twisted cable pair) rather than by referencing to ground. If
that's the case, the ground shouldn't matter for the signal transmission.
The signal is supposed to be differential, however there are some devices
that take each line with the ground as reference and only then subtract it.
On Thu, Dec 25, 2014 at 11:59 AM, Alex Shnitman alext...@gmail.com wrote:
Isn't the USB signal differential? I understand that this means that
Power on the Raspberry Pi is a tricky business. I think on the B+ they've
made it easier to deal with but it still cannot pass through a lot of
current. So a powered hub is necessary, as previous posters mentioned.
It does indeed backfeed into the Pi. I used thin stripes of electrical tape
to
On Tue, Dec 23, 2014 at 4:19 PM, Alex Shnitman alext...@gmail.com wrote:
Power on the Raspberry Pi is a tricky business. I think on the B+ they've
made it easier to deal with but it still cannot pass through a lot of
current. So a powered hub is necessary, as previous posters mentioned.
It
I've got this one:
http://www.dynamode.com/english/pages/product/Datacom%20Products/USB%20Products/USB-H40-A2-0.html
when I connected this device to the Raspberry I got these message
Dec 17 13:59:48 pi kernel: [246075.608736] usb 1-1.4: new high-speed USB
device number 112 using dwc_otg
Dec 17
On 12/17/2014 4:03 PM, Gabor Szabo wrote:
I've got this one:
http://www.dynamode.com/english/pages/product/Datacom%20Products/USB%20Products/USB-H40-A2-0.html
Is it plugged into the wall? If you don't use an external power source,
it is in passive mode, which means the overhead of the hub, and
On 17/12/2014 16:03, Gabor Szabo wrote:
I've got this one:
http://www.dynamode.com/english/pages/product/Datacom%20Products/USB%20Products/USB-H40-A2-0.html
when I connected this device to the Raspberry I got these message
Dec 17 13:59:48 pi kernel: [246075.608736] usb 1-1.4: new high-speed
I've got one of these.
Among other things it lets me power an external hdd.
http://www.cnx-software.com/2013/12/21/x100-raspberry-pi-expansion-board-adds-vga-output-rtc-and-more/
Alternatively make sure when you get a powered hub it does not backfeed in
to the pi. You might need to disconnect pin
So finally I install the Raspberry Pi I bought a few weeks ago and wanted
to add an external HDD.
I plugged in the external hard drive and /var/log/syslog printed the
following:
Dec 14 17:02:55 pi kernel: [ 759.981949] usb 1-1.3: new high-speed USB
device number 8 using dwc_otg
Dec 14 17:02:55
Are you providing the external HDD with sufficient electricity? The
Raspberry is most likely not capable of providing enough current...
2014-12-14 19:30 GMT+02:00 Gabor Szabo ga...@szabgab.com:
So finally I install the Raspberry Pi I bought a few weeks ago and wanted
to add an external HDD.
I
Hmm, good question. The Raspberry does see the device when it is connected,
so is it possible that it needs more
power after later on?
How can I check?
If the problem is lack of current, how can I solve that? Can I put one of
these usb hubs that also provide power between the two?
Gabor
On
Get a powered USB hub (i.e. a usb hub which also connects to a wall power
socket). I'm not familiar with RPi USB version but check for USB 3.0 vs.
2.0.
On 15 December 2014 at 06:07, Gabor Szabo ga...@szabgab.com wrote:
Hmm, good question. The Raspberry does see the device when it is
connected,
Raspberry Pi uses USB2.0, it can't provide enough current to big peripheral
devices full stop.
It's so bad that plugging in a disk-on-key while it's running can cause a
sufficient voltage drop to reboot the system (after which the d-o-k will
work).
That's why you need to have a powered USB hub,
13 matches
Mail list logo
