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by johnbeetem
Sun Jan 10, 2016 1:41 am
Forum: General discussion
Topic: I made a Raspberry PI Laptop
Replies: 836
Views: 317462

Re: I made a Raspberry PI Laptop

Here is a quote that I'd saved from a previous post or webpage, but unfortunately I have lost the reference: "I just got my Lapdock working! I used the same cables and adapters as Drew's first list... I recognize that quote! :) There's an Atrix Lapdock summary at the elinux.org RasPi Wiki: http://e...
by johnbeetem
Sun May 24, 2015 3:50 pm
Forum: General discussion
Topic: I made a Raspberry PI Laptop
Replies: 836
Views: 317462

Re: I made a Raspberry PI Laptop

Lob0426 wrote:I don't know why reversing them sometimes works. It is always worth trying!
A USB device's D+ and D- have pull-up and/or pull-down resistors to identify the device as low-speed, full-speed, or high-speed. If you reverse D+ and D- the USB host gets confused.
by johnbeetem
Sat Jul 12, 2014 1:19 am
Forum: General discussion
Topic: Consider adding a FPGA to a new model?
Replies: 15
Views: 3305

Re: Consider adding a FPGA to a new model?

mahjongg wrote:you want an FPGA with a "new model" of the PI?
Simple, just have a Compute Module IO Board designed that contains an FPGA!
That's a nice idea and quite feasible. As always with these projects, the hard part is selling enough boards to get the price down to something affordable.
by johnbeetem
Sat Jul 12, 2014 1:17 am
Forum: General discussion
Topic: Consider adding a FPGA to a new model?
Replies: 15
Views: 3305

Re: Consider adding a FPGA to a new model?

There are quite a few FPGA boards with a USB connection that allows them to be downloaded from RasPi. My favorite is the Gadget Factory Papilio One with Spartan-3E 250K . It's currently US$38. Gadget Factory also has a Spartan-3E 500K version and a Spartan-6 Papilio Pro with an LX9. Gadget Factory j...
by johnbeetem
Sat Jul 12, 2014 1:02 am
Forum: Off topic discussion
Topic: My new board (With better pictures)
Replies: 57
Views: 15242

Re: My new board

The AT&T chip is a "Field-Programmable Gate Array". I'm not aware* that AT&T ever made FPGAs so if the chip really is a FPGA I'd surmise that the logo is on it because it is 'programmed' to perform some logic that AT&T required. Much less chance of it being part of a 'computer' than telco switching...
by johnbeetem
Wed May 28, 2014 11:28 pm
Forum: General discussion
Topic: FPGA Stuff ?
Replies: 48
Views: 12690

Re: FPGA Stuff ?

For those interested in reasonably-priced FPGA boards, Gadget Factory has just begun a Kickstarter on their new Papilo DUO board, which is a combined Xilinx Spartan 6 FPGA development board and Arduino clone: https://www.kickstarter.com/projects/13588168/papilio-duo-drag-and-drop-fpga-circuit-lab-fo...
by johnbeetem
Tue Dec 10, 2013 7:07 pm
Forum: General discussion
Topic: I made a Raspberry PI Laptop
Replies: 836
Views: 317462

Re: lapdock 100 - brightness control?

Did you actually get your lapdock 100 to work on a consistant basis. I can't not get my monitor to stay on for more than 2 seconds no matter who's "How To" instructions I follow. I am about to give up on the 100. Yes, it works for me. Lapdock 100 needs usb to be connected together with hdmi.Then it...
by johnbeetem
Sun Nov 10, 2013 2:36 pm
Forum: General discussion
Topic: I made a Raspberry PI Laptop
Replies: 836
Views: 317462

Re: I made a Raspberry PI Laptop

You must cut the CEC/DEC ground in order to shut down the lapdock without disconnecting the pi. Sounds like a HDMI thing on pin 17, am I right? How would I do that? For a summary of Atrix Lapdock interfacing, see the RasPi Hardware Wiki . For gory details of the DDC/CEC ground, see my 'blog entry a...
by johnbeetem
Sat Nov 09, 2013 11:26 pm
Forum: General discussion
Topic: I made a Raspberry PI Laptop
Replies: 836
Views: 317462

Re: I made a Raspberry PI Laptop

I'm trying to connect my Raspi model B 512MB (a chinese RS unit) to an Atrix Lapdock but I have power issues. I'm powering Raspi through the microusb port of the lapdock (I split power and signal cables routing the first to the microusb of the raspi and the second to the Raspi USB). The raspi boots...
by johnbeetem
Wed Oct 30, 2013 11:54 pm
Forum: General discussion
Topic: problems setting raspberry pi up with lapdock 500
Replies: 100
Views: 23757

Re: problems setting raspberry pi up with lapdock 500

John wrote: "I use a 30 cm Micro USB female to USB A cable which back-powers my RasPi through one of RasPi's A ports with almost no voltage drop." The lapdock's power adapter is only 2A. Is 2A adequate voltage to power lapdock, pi, usb wifi and a usb memory card reader? Or does the pi need its own ...
by johnbeetem
Wed Oct 09, 2013 6:45 pm
Forum: General discussion
Topic: I made a Raspberry PI Laptop
Replies: 836
Views: 317462

Re: I made a Raspberry PI Laptop

Does anyone know how to open the case of a Lapdock 100 without snapping it? I finally got all my cables to connect it to my Model B rev2 Pi (2 x micro m/f USB & HDMI cables plus 2 micro f to fullsize USB/HDMI adaptors, so I backfeed through the USB port and avoid splicing cables). After connecting ...
by johnbeetem
Thu Sep 26, 2013 6:06 pm
Forum: General discussion
Topic: I made a Raspberry PI Laptop
Replies: 836
Views: 317462

Re: I made a Raspberry PI Laptop

Did anyone manage to successfully set the resolution to 1366x768? Mine defaults to 1280x720 and various variations in config.txt didn't help the matter. Any tips? My Atrix Lapdock came up automatically in 1366x768 mode on an early RasPi Model B running Debian "Squeeze". The only thing I needed to d...
by johnbeetem
Tue Sep 24, 2013 11:45 pm
Forum: General discussion
Topic: I made a Raspberry PI Laptop
Replies: 836
Views: 317462

Re: I made a Raspberry PI Laptop

Boosting the HDMI signal to setting 4 did nothing. I even pushed the connections in very hard before attempting a test. Out of curiosity, I plugged my actual laptop into the Lapdock. The Lapdock started as soon as I plugged in my laptop, but then died, again. Now I am in the process of rebooting my...
by johnbeetem
Tue Sep 24, 2013 9:15 pm
Forum: General discussion
Topic: I made a Raspberry PI Laptop
Replies: 836
Views: 317462

Re: I made a Raspberry PI Laptop

2. I have no way to test this right now, but I have switched the HDMI cables with that of my monitor after the Pi boots with power from the Lapdock. The Pi fully boots and displays the login prompt, so the Pi has power. Side note: I plugged the Pi into my wall outlet and managed to get my Lapdock t...
by johnbeetem
Tue Sep 24, 2013 6:36 pm
Forum: General discussion
Topic: I made a Raspberry PI Laptop
Replies: 836
Views: 317462

Re: I made a Raspberry PI Laptop

I am trying to make a Raspberry Pi Laptop as well, but I have a small problem: the screen keeps going blank about 5 seconds after plugging it in. :x That's very strange. I've heard of that problem happening with a Lapdock 500 , but not a Lapdock 100 which from what I read works like an Atrix or Bio...
by johnbeetem
Mon Sep 16, 2013 11:01 pm
Forum: General discussion
Topic: Sssssmokin'! (256MB Model B issue)
Replies: 2
Views: 684

Re: Sssssmokin'! (256MB Model B issue)

Since I understand that early Model B units cannot be "back-powered" like the later ones, due to a polyfuse which limits the current that can go through the USB ports (is my understanding of this correct?), I connected the RPi to a suitable known-good external power source, and assumed that it woul...
by johnbeetem
Sat Sep 14, 2013 6:37 pm
Forum: General discussion
Topic: I made a Raspberry PI Laptop
Replies: 836
Views: 317462

Re: I made a Raspberry PI Laptop

I have a lapdock for the Droid Razr (its a 100 still) and was trying to solder a normal size USB onto it. However, the USB has 6 cables, with colors Red, Black, Green, White, Brown and Grey. Can anyone help me out? I'd like to get this working. On 27 August sepeters wrote a comment about this: Well...
by johnbeetem
Tue Sep 10, 2013 11:31 pm
Forum: General discussion
Topic: problems setting raspberry pi up with lapdock 500
Replies: 100
Views: 23757

Re: problems setting raspberry pi up with lapdock 500

By trying different cables I have and trying to switch things around, I suspect that the following adaptor may be a problem in my setup: http://img.dxcdn.com/productimages/sku_176085_1.jpg http://dx.com/p/micro-hdmi-female-to-hdmi-female-adapter-black-176085 Has anyone had a success with using thes...
by johnbeetem
Tue Sep 03, 2013 5:56 pm
Forum: General discussion
Topic: I made a Raspberry PI Laptop
Replies: 836
Views: 317462

Re: I made a Raspberry PI Laptop

A glance inside the rear cover (three screws, two under rubber feet) of the Motorola ATRIX LapDock reveals an RF shielded circuit with what appears to be an antenna taped to the cover. I'm unsure if this is BlueTooth or WiFi, but it may offer additional functionality. I could be wrong, but I think ...
by johnbeetem
Mon Aug 19, 2013 1:14 pm
Forum: General discussion
Topic: problems setting raspberry pi up with lapdock 500
Replies: 100
Views: 23757

Re: problems setting raspberry pi up with lapdock 500

I GOT IT TO WORK!!!!! I broke down and bought a little bit better HDMI cable and it is finally working. Still having the issue that it won't come on consistently but this is a huge leap in the right direction. I'm waiting for my video to upload to YouTube but when it is finished I will post a link ...
by johnbeetem
Fri Jul 12, 2013 11:47 pm
Forum: General discussion
Topic: I made a Raspberry PI Laptop
Replies: 836
Views: 317462

Re: I made a Raspberry PI Laptop

There is no communication between the Lapdock and the Raspberry Pi about battery status on mine. I didn't expect there to be, to be honest. Batteries with built in 'intelligence' usually communicate over SMBus, a derivative of I2C. I wonder if there is an SMBus to USB adapter buried in there somewh...
by johnbeetem
Mon Jul 08, 2013 7:08 pm
Forum: General discussion
Topic: N-channel MOSFET on GPIO
Replies: 31
Views: 20429

Re: N-channel MOSFET on GPIO

Just bumping this up. I'm really hoping someone is able to explain to me in layman's terms how to get this working properly. The MOSFET is working intermittently, but I don't have any resistors involved. What do I need to do in terms of adding resistors to increase the Gate voltage? Running at 3.3V...
by johnbeetem
Mon Jul 08, 2013 1:34 am
Forum: General discussion
Topic: N-channel MOSFET on GPIO
Replies: 31
Views: 20429

Re: N-channel MOSFET on GPIO

On further research, it appears that the maximum Gate voltage for the above listed N-channel MOSFET is 2.5V...Seeing as it's receiving a 3.3V Gate signal when GPIO4 is set to High, I'm guessing it won't work? Strange, seeing as this MOSFET is designed for use with the Arduino, which operates at sim...
by johnbeetem
Tue Jul 02, 2013 6:02 pm
Forum: The Staffroom
Topic: Assembly - any use in teaching it?
Replies: 138
Views: 19935

Re: Assembly - any use in teaching it?

mvbii wrote:I first learned PDP-8 assembler (key in the boot loader, then start up your KSR33 to load the assembler and your code)
I'm sure you mean ASR-33. PDP-8 ASM requires a certain amount of masochism, but a KSR-33 is a bit much ;)
by johnbeetem
Wed Jun 26, 2013 11:10 pm
Forum: Off topic discussion
Topic: who knew bagpipes could be cool
Replies: 6
Views: 1068

Re: who knew bagpipes could be cool

According to the late Irish comedian Dave Allen, bagpipes were invented by the Irish. They gave them to the Scots, who still haven't caught on to the joke. All kidding aside, I rather like the pipes. Although I heard a cautionary story of a man who died of laughter while watching a British comedy sh...

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