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Kurtois
Jan 28, 2014, 11:42:28 PM1/28/14
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I am just trying to understand the issue I am running into with my first Android device.
I have an Azpen A700 (yes, the $40 Micro Center Android Tablet) which has USB OTG support. Here is a diagram of my connections:
Diagram:
Android Tablet > USB OTG Cable > USB Hub > Apple USB Keyboard w/ 2 ports + USB Mouse
When I do the following, the Android tablet recognizes the keyboard and mouse in tandem, i.e. they both function at the same time:
Android Tablet > USB OTG Cable > Apple USB Keyboard w/ 2 ports + USB Mouse
Is anyone familiar the USB OTG that might have some insight as to what is going on?
Kamikaze Joe
Jan 29, 2014, 12:13:53 AM1/29/14
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I'm not understanding your issue. What's not working? What are you trying to do?
Preserve your right to privacy. When replying to this email, I encourage you to make use of PGP compliant encryption. My key ID is A50DB9BC.
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Kurtois
Jan 29, 2014, 9:14:22 AM1/29/14
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I apologize. Let me try again.
======
Figure #1:
Android Tablet > USB OTG Cable > USB Hub > Apple USB Keyboard w/ 2 ports + USB Mouse
Either keyboard works or the mouse works. Not both. Seems dependent on which is plugged in first.
Figure #2
Android Tablet > USB OTG Cable > Apple USB Keyboard w/ 2 ports + USB Mouse
Both keyboard and mouse work. Note that the USB Mouse is plugged into one of the physical ports that makes up the Apple USB Keyboard.
======
Problem:
Why does Figure #1's configuration not work? Is it because there are two USB Hosts involved?
Let me know if I can clarify further. Sorry again for the initial confusing post.
Kurt
Chris Weiss
Jan 29, 2014, 10:20:56 AM1/29/14
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is the hub separately powered or bus powered? if not separately, that
may be drawing too much power to run 2 hubs and 2 devices.
may be drawing too much power to run 2 hubs and 2 devices.
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Kurtois
Jan 30, 2014, 7:26:36 PM1/30/14
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Sorry for lacking this detail about the USB Hub in my initial notes.
The USB Hub in Figure 1 (described in previous message) is a Belkin F5U237 7-Port Hub. The documentation indicates that the per port voltage is 5V, 500mA (max).
Link the the documentation, for those interested:
In any case, I am just pleased that I can use this $40 tablet almost like a full fledged machine with full-sized keyboard and mouse.
Thank you for the input.
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