USB Powered Hub and Beaglebone Black

[g***@public.gmane.org]

I have a beaglebone black. the challenge I face is that I require multiple
powered USB devices to be connected to it while only using one power source
- the BBB 5V DC connector

1 - USB Camera - Logitech C920
1 - USB GPS Antenna
1 - USB WiFi Adaptor
1 - USB Bluetooth Adaptor

Clearly the onboard USB port cannot supply enough power using an unpowered
hub to bring these devices up.

How would I wire the external powered hub to the Beaglebone Black to
satisfy the single power source requirement?
1) Would I tie +/- to the same DC power source before the BB and somehow
adapt the USB cable for TX/RX only thus bypassing the board for the power
on the hub?


hub | ===tx/rx USB===|bbb 5v|======+/-
| +5V-------------------------------------| |
| gnd----------------------------------------|

2) Would I use the +/-5V expansion header and somehow adapt the USB cable
for TX/RX only? thus using the BB to supply power?

hub | ===tx/rx USB===BBBUSB
| +/-----------------------| bbb expansion header 5v |======+/-

I tried scenario 1 already and somehow destroyed my BB (won't boot, no LEDs
- looks like a brick), bit hesitant to try 2) as I don't want to brick
another.

I am not an electrical engineer.




Thanks-Wesley

[Gerald Coley]

Plug in a power supply to the external HUB.

Gerald

Post by g***@public.gmane.org
I have a beaglebone black. the challenge I face is that I require
multiple powered USB devices to be connected to it while only using one
power source - the BBB 5V DC connector
1 - USB Camera - Logitech C920
1 - USB GPS Antenna
1 - USB WiFi Adaptor
1 - USB Bluetooth Adaptor
Clearly the onboard USB port cannot supply enough power using an unpowered
hub to bring these devices up.
How would I wire the external powered hub to the Beaglebone Black to
satisfy the single power source requirement?
1) Would I tie +/- to the same DC power source before the BB and somehow
adapt the USB cable for TX/RX only thus bypassing the board for the power
on the hub?
hub | ===tx/rx USB===|bbb 5v|======+/-
| +5V-------------------------------------| |
| gnd----------------------------------------|
2) Would I use the +/-5V expansion header and somehow adapt the USB cable
for TX/RX only? thus using the BB to supply power?
hub | ===tx/rx USB===BBBUSB
| +/-----------------------| bbb expansion header 5v |======+/-
I tried scenario 1 already and somehow destroyed my BB (won't boot, no
LEDs - looks like a brick), bit hesitant to try 2) as I don't want to brick
another.
I am not an electrical engineer.
Thanks-Wesley
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[g***@public.gmane.org]

In this particular case I am trying to reduce the number of power supplies
required.

I'd like to use a single DC power source for both the hub and the BBB. The
question is whether the BBB should supply additional power to the hub
through the 5V header on the BBB or bypass the BBB altogether for power.
Is there some kind of over current or ground loop that would be introduced
that would cause undesired effects?

I'm worried about bricking the board and I'd like to know the "safe" way to
do this.

Thanks-Wesley

Post by Gerald Coley
Plug in a power supply to the external HUB.
Gerald

Post by g***@public.gmane.org
I have a beaglebone black. the challenge I face is that I require
multiple powered USB devices to be connected to it while only using one
power source - the BBB 5V DC connector
1 - USB Camera - Logitech C920
1 - USB GPS Antenna
1 - USB WiFi Adaptor
1 - USB Bluetooth Adaptor
Clearly the onboard USB port cannot supply enough power using an
unpowered hub to bring these devices up.
How would I wire the external powered hub to the Beaglebone Black to
satisfy the single power source requirement?
1) Would I tie +/- to the same DC power source before the BB and somehow
adapt the USB cable for TX/RX only thus bypassing the board for the power
on the hub?
hub | ===tx/rx USB===|bbb 5v|======+/-
| +5V-------------------------------------| |
| gnd----------------------------------------|
2) Would I use the +/-5V expansion header and somehow adapt the USB cable
for TX/RX only? thus using the BB to supply power?
hub | ===tx/rx USB===BBBUSB
| +/-----------------------| bbb expansion header 5v |======+/-
I tried scenario 1 already and somehow destroyed my BB (won't boot, no
LEDs - looks like a brick), bit hesitant to try 2) as I don't want to brick
another.
I am not an electrical engineer.
Thanks-Wesley
--
For more options, visit http://beagleboard.org/discuss
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[Robert Nelson]

Post by g***@public.gmane.org
In this particular case I am trying to reduce the number of power supplies
required.
I'd like to use a single DC power source for both the hub and the BBB. The
question is whether the BBB should supply additional power to the hub
through the 5V header on the BBB or bypass the BBB altogether for power. Is
there some kind of over current or ground loop that would be introduced that
would cause undesired effects?
I'm worried about bricking the board and I'd like to know the "safe" way to
do this.

Just splice two barrel connectors (one for the bbb and one for the
hub) into one wall plug.

Regards,
--
Robert Nelson
http://www.rcn-ee.com/

[Edward Goldberg]

I use a hub from Plugable that has a 3A power supply. One of the largest
for a USB hub.

Then I remove the plastic cover and "tap" right after the LARGE CAP that
stores the 5V for the hub ports "Inside" the hub.

The two wires that lead out of the hub are now "Upstream" from all of the
loss created by the USB style connectors and parts.

This new "regulated" and filters power can be used for all of my needs up
to the 3A at 5V ( + 5% !! 5.25V ) for all of the projects.

This higher supply covers all of the loss in the power cable and
connectors. So an the card I see 5V at the test points.

REMEMBER: Each "pin" can only pass 1A with no loss. Over 1A for each pin
in these connectors you will have Volt loss...