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Banana Pi + CT Ewell Case (Part 4 - Lapdock)

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Edited by actkk2000 at Mon Oct 27, 2014 00:36

This is an update to http://forum.lemaker.org/thread- ... _part_3_dht11_.html

Despite I mostly use RaspberryPi (RPI) and BananaPi (BPI) as headless servers and connected through SSH, sometimes I used a 7" TFT monitor, could be on Raspbmc or Pimame (I dont like new version called Piplay), or Android for BananaPi (and now LeMedia, I have to try it...)
Some time ago I got the idea of change it for something with a better resolution because it was difficult to read small characters.
Since I was sharing the monitor between RPI and BPI because it has 2 inputs, I also needed something capable to connect to both devices.
And another perk will be a better keyboard because the small wireless version also is not confortable, even when RPI has a backlit keyboard.

Then I found this, that made me want to give it a try:

The challenge will be also to find the correct adapters but the result will be worthy.
Luckily I could purchase a Motorola Lapdock for Atrix which I read it was fully compatible with RPI and (therefore) with BPI:

There are also references to Lapdock for 4G and Lapdock 100 but there are two versions of the last one and just one is compatible, then I rather the Atrix model:
http://www.instructables.com/id/ ... ock-Connection/all/
http://www.adafruit.com/blog/201 ... aspberry-pi-laptop/
http://www.adafruit.com/blog/201 ... trix-4g-dock-video/
https://translate.google.com.ar/ ... t-text=&act=url

So I found these adapters that worked for me and I bought them from China. Perhaps there are others, and you may buy them somewhere else:
http://www.dx.com/p/micro-usb-ma ... 123738#.VE1jBHl0yHs
http://www.dx.com/p/micro-usb-fe ... dapter-black-172524
http://www.dx.com/p/micro-usb-fe ... 172524#.VE1iynl0yHs
http://www.dx.com/p/cy-hd-156-bk ... 279467#.VE1jIXl0yHs
I believe here you may find all you need as well: http://www.cable.cc/

As for HDMI adapters, there are many that won't work because of quality and to get this done it is needed some internal connections that not all adapters have:
http://www.element14.com/communi ... i-cable-work-around

Unfortunately they messed my order and sent me by mistake another HDMI adapter, not a micro HDMI female to female, but a regular size adapter.
I wanted this: http://www.dx.com/p/micro-hdmi-f ... 221547#.VE1jcnl0yHs
Now this cable is useless without the adapter but I ordered another adapter see if I can make it work as well:
http://www.dx.com/p/micro-hdmi-v ... -65401#.VE1jgnl0yHs

The micro female HDMI to male HDMI worked perfectly but it was too short. To extend it using a coupling adapter also didn't work (I tried 2 different).
Then I got this HDMI switch wich is perfect to connect up to 3 devices and also to make the extensions:

As for the USB connection, there is also a catch and it is to avoid backpower from the lapdock to BPI or RPI USB ports. To do that I cutted the 5V red wire on the USB extension cable like this:
http://1.bp.blogspot.com/-jLnxjE ... 20120609_093557.jpg

But if I got a HDMI switch, I also will need a USB switch. An I had this one but unfortunately did'nt work, perhaps it was too old...

So in the end I designed and built my own USB switch and attached the HDMI switch to it.
With an inverter push-button I select the input (maximun of two), a red led shows if the lapdock is connected and blue leds show if BPI and RPI are connected as well.
In every case the USB 5v red wires are only connected to power the leds and not connected to the lapdock, so no backpower is possible (click to enlarge):

Finally some more pictures and video while testing and also the final result (click to enlarge):

Click on the videos:

This is all together (click on it):

See you all on the next update!

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