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Old 21-01-2015, 07:29 AM   #1
MattG
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Default Raspberry Pi Laptop

first off , if you dont know what a Raspberry Pi is , its a very very cheap computer, runs a version of linux/others ,sort of a playground for big kids like me http://www.raspberrypi.org/

My daughter has just started a weekend Pi course at her local school (she is 14)

thought it would be good if we made a Pi Laptop together... not sure if it will work , only laptop we had was a small 10.1inch screen Netbook, Acer Aspire One.

First thing was to take it to bits ., not sure if it will be thick enough to hold a Pi ( its about 17mm thick ) but we can work around that later.

beers needed :



After taking it to bits i thought the best thing before spending money on a ebay display and driver was to get the keyboard to work first.

i have found a old USB keyboard, so i am just going to try and butcher that onto the 24pin connector of laptop keyboard first.



as for display , i am look at these :

http://www.ebay.co.uk/itm/10-1-Inch-...item4188bc8baf

but i notice that they are 12v ! , was hoping oneday to use the laptop battery , but thats only rated at 11.2v ..
advice on this ? 1) can you get lower power hdmi drivers ? 2) is it unrealistic of me running it on a laptop battery ?

hope to strip down main keyboard tonight , might end in failure ...
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Old 21-01-2015, 07:29 AM   #2
MattG
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small success on keyboard side

daughter took a logitec USB keyboard to bits , then proceeded to play with it



removed driver board



this had two connectors , 8pins and 18 pins.



i thought that the 8 pins might be similar to the 6/18 pin connector i have , but its one connector..

one cut later , i have two connectors :



so i plug in the 18 to 18 , and the 6 to the 8 ( down one end )

and plug it in !!!

it works !! .. well some letters work ,but not all , so i guess its my matrix on that keyboard is different .. anyway keys that do something when i press are :

F1,F2,F3,F4,F6,F7,F8,F9,F12,prntscreen,pause,del
1,2,3,5,7,9,-
tab,Q,P,@
caps,;,@
/,>
left arrow , right ,up and down arrows
page up

ok , these dont actually perform the correct keyboard function ..but i knew that would happen..

so advice ?what methods do i have of reverse engineering the matrix in both keyboards ?
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Old 21-01-2015, 07:30 AM   #3
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after working out the matrix inside the keyboard is 1)different 2) pinouts in different places i decieded i needed to know the wiring diagram of the laptop keyboard

After a night of careful thinking , and a few stellas i thought i would rip the keyboard apart to find the matrix pattern



to be fair , i think i had cut the connector as well , so it was a bit damaged at this point

i then un peeled it , as its not two seperate layers



i then traced the wires that go to the top layer ..., which i now know :

(this is looking at the top , with rubber keypads on top :

pins 1 to 26 ( pin 7 is blank and not connected )

pins 5,7,9,12,18,22,23,24 are the rows ( as i call them )

other pins are the columns of the matrix.

so i now need to map correctly to my USB driver out of my other keyboard,

I can now see why half the keys did not work.

ordered new keyboard .

now looking for a 24 pin CSI/DSI ribbon connector that i can use....cant find one yet
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Old 21-01-2015, 09:01 AM   #4
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Looks an interesting project, I've got a Pi but haven't done much with it other than setting up a media server using xbmc.
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Old 21-01-2015, 09:22 AM   #5
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Quote:
Originally Posted by MattG View Post
now looking for a 24 pin CSI/DSI ribbon connector that i can use....cant find one yet
found me a connector and ordered , should have all i need to get keyboard working now..

well apart from key mapping at a OS level .. next thing
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Old 22-01-2015, 03:58 PM   #6
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Might be fun with an arduino too http://www.ebay.co.uk/itm/UNO-R3-Ard...item2a48169f94
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