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  • Raspberry Pi Micro Arcade Machine Packs Gaming into a Tiny Case

    - by Jason Fitzpatrick
    While it might be more practical to build a full-size MAME cabinet for your retro gaming enjoyment, this tiny and fully functional build is a great example of the fun you can have tinkering with electronics. Read on to see a video of it in action. Courtesy of tinker and electronics hobbyist Sprite over at SpriteMods, the build is clever in so many ways. The heart of the device is a Raspberry Pi board, it includes a tiny video marque that displays the logo of whatever game you’re playing, and the micro-scaled joystick and buttons are fully functional. Hit up the link below for his detailed build guide including his custom built cellphone-battery based charging system. Raspberry Pi Micro Arcade Machine [via Hack A Day] How To Use USB Drives With the Nexus 7 and Other Android Devices Why Does 64-Bit Windows Need a Separate “Program Files (x86)” Folder? Why Your Android Phone Isn’t Getting Operating System Updates and What You Can Do About It

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  • Micro QR Code Generator with minimal error correction

    - by Florian Peschka
    I am searching a Micro QR Code Generator that fulfills the following requirements: At least 20 characters encoded Minimal error correction (required to get the 20 characters stuffed in) I already searched google, but it seems all micro qr generators automatically use maximum error correction, which is very unhandy for my task, as we need the 20 characters completety. I can't use standard QR because there are certain requirements that need the code to be smaller than a certain dimension when printed... I hope someone can help me. PS: I'm not sure that this is the right board to post this question on, so feel free to redirect me to a better board if you have an idea. PPS: If nothing can be found and I'm forced to write one on my own: Where can I find detailed information on how to write a QR code generator?

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  • Why Android for new (micro) consoles?

    - by Klaim
    There are a lot of new (micro) consoles with Android inside coming soon or already there (OUYA for example). My question is: why use Android and not another OS as base for these consoles? I assume that there are pragmatic answers to this but I can't see any clear killer feature. For example, one can assume that any stable Linux distribution would work (like Valve seem to think). Android is primarily targetted at mobile platforms which mean it is built around the idea of being interrupted which goes against a lot of what console devs needs in new hardware - but is not killing Android as a platform for gamedev either as it's just a constraint. Why not another OS? What's the Android killer features that make micro-console builder using it instead of Linux or anything else?

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  • Java: micro-optimizing array manipulation

    - by Martin Wiboe
    Hello all, I am trying to make a Java port of a simple feed-forward neural network. This obviously involves lots of numeric calculations, so I am trying to optimize my central loop as much as possible. The results should be correct within the limits of the float data type. My current code looks as follows (error handling & initialization removed): /** * Simple implementation of a feedforward neural network. The network supports * including a bias neuron with a constant output of 1.0 and weighted synapses * to hidden and output layers. * * @author Martin Wiboe */ public class FeedForwardNetwork { private final int outputNeurons; // No of neurons in output layer private final int inputNeurons; // No of neurons in input layer private int largestLayerNeurons; // No of neurons in largest layer private final int numberLayers; // No of layers private final int[] neuronCounts; // Neuron count in each layer, 0 is input // layer. private final float[][][] fWeights; // Weights between neurons. // fWeight[fromLayer][fromNeuron][toNeuron] // is the weight from fromNeuron in // fromLayer to toNeuron in layer // fromLayer+1. private float[][] neuronOutput; // Temporary storage of output from previous layer public float[] compute(float[] input) { // Copy input values to input layer output for (int i = 0; i < inputNeurons; i++) { neuronOutput[0][i] = input[i]; } // Loop through layers for (int layer = 1; layer < numberLayers; layer++) { // Loop over neurons in the layer and determine weighted input sum for (int neuron = 0; neuron < neuronCounts[layer]; neuron++) { // Bias neuron is the last neuron in the previous layer int biasNeuron = neuronCounts[layer - 1]; // Get weighted input from bias neuron - output is always 1.0 float activation = 1.0F * fWeights[layer - 1][biasNeuron][neuron]; // Get weighted inputs from rest of neurons in previous layer for (int inputNeuron = 0; inputNeuron < biasNeuron; inputNeuron++) { activation += neuronOutput[layer-1][inputNeuron] * fWeights[layer - 1][inputNeuron][neuron]; } // Store neuron output for next round of computation neuronOutput[layer][neuron] = sigmoid(activation); } } // Return output from network = output from last layer float[] result = new float[outputNeurons]; for (int i = 0; i < outputNeurons; i++) result[i] = neuronOutput[numberLayers - 1][i]; return result; } private final static float sigmoid(final float input) { return (float) (1.0F / (1.0F + Math.exp(-1.0F * input))); } } I am running the JVM with the -server option, and as of now my code is between 25% and 50% slower than similar C code. What can I do to improve this situation? Thank you, Martin Wiboe

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  • .NET Micro Edition - Open Multiple Windows

    - by RM
    I've had a look through quite a few tutorials, but cant seem to find how to open multipe windows? I'm not expecting to have them layer etc, I just want to define multiple window classes and say, from a menu, launch the appropriate window class from the menu window. Then when that window is finished, call the close method on it and menu will show again. I have managed to do the same kind of functionality using panels, but think window is really what I should be using? (.NET MF 4.0) I assume you can do this? I think im missing something obvious?

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  • Caliburn.micro View ViewModel name resolution issue

    - by user1459773
    I am using a namespace called ComShorCaliburnWPF.ViewModules.Views.ShortMenuWindows.GWDSCT on my View.xaml and View.cs, for my ViewModel.cs and my IoC container I am using ComShorCaliburnWPF.ViewModules.Views.ShortMenuWindows.GWDSCT. When I remove the GWDSCT at the end it works fine, but in its current state it does not. I would like it to work how it is now because it accurately reflects where the files are located. Any suggestions?

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  • HP Pavilion tx2000 - Wifi adapter no longer works after moving from 12.04 to a 12.10 clean install

    - by Marek L.
    I have a HP Pavilion tx2000 that I have been running Ubuntu 12.04 on for a couple of months without any problems (wifi worked great) until yesterday when my hard drive failed. I replaced the hard drive and decided to install Ubuntu 12.10. Unlike 12.04, the wifi did not work after the installation finished and all the updates where installed (over Ethernet). The network drop down in the top right didn't even show a wireless option. I Googled about for a bit and found some solutions that seemed like they might work. Unfortunately they did not. Here is what I tried: sudo apt-get remove bcmwl-kernel-source sudo apt-get install b43-fwcutter sudo apt-get install firmware-b43-lpphy-installer Restart the computer. And the wifi still didn't work. At which point I panicked a bit and tried to undo the previous commands by running: sudo apt-get remove b43-fwcutter firmware-b43-lpphy-installer sudo apt-get install bcmwl-kernel-source Restart the computer. The wifi still doesn't work. This is where I stopped because I have no idea what I am doing and don't want to mess something up. The network drop down still doesn't show a wireless option and the hardware wifi switch on the laptop is amber (it turns blue when the wifi is on). Using the hardware switch does not change the color. Output from: sudo lspci ... 08:00.0 Network controller: Broadcom Corporation BCM4322 802.11a/b/g/n Wireless LAN Controller (rev 01) ... Output from: sudo lshw -class network *-network UNCLAIMED description: Network controller product: BCM4322 802.11a/b/g/n Wireless LAN Controller vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:08:00.0 version: 01 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: latency=0 resources: memory:d1100000-d1103fff ... Output from: sudo rfkill list all 0: hp-wifi: Wireless LAN Soft blocked: no Hard blocked: yes UPDATE: After writing up this question tried the following command: sudo rfkill unblock all At first it didn't do anything but after running it about four times, sudo rfkill list all now returns: 0: hp-wifi: Wireless LAN Soft blocked: no Hard blocked: no But the network menu still does not have a wireless option and the hardware switch still glows amber. Pushing the hardware switch turns the hard block back on and I have to run sudo rfkill unblock all multiple times again to turn it off. Any help is appreciated! Update 2: Full output from sudo lspci -nn: 00:00.0 Host bridge [0600]: Advanced Micro Devices [AMD] RS780 Host Bridge [1022:9600] 00:01.0 PCI bridge [0604]: Advanced Micro Devices [AMD] RS780/RS880 PCI to PCI bridge (int gfx) [1022:9602] 00:04.0 PCI bridge [0604]: Advanced Micro Devices [AMD] RS780/RS880 PCI to PCI bridge (PCIE port 0) [1022:9604] 00:05.0 PCI bridge [0604]: Advanced Micro Devices [AMD] RS780/RS880 PCI to PCI bridge (PCIE port 1) [1022:9605] 00:06.0 PCI bridge [0604]: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE port 2) [1022:9606] 00:11.0 SATA controller [0106]: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 SATA Controller [AHCI mode] [1002:4391] 00:12.0 USB controller [0c03]: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI0 Controller [1002:4397] 00:12.1 USB controller [0c03]: Advanced Micro Devices [AMD] nee ATI SB7x0 USB OHCI1 Controller [1002:4398] 00:12.2 USB controller [0c03]: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB EHCI Controller [1002:4396] 00:13.0 USB controller [0c03]: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI0 Controller [1002:4397] 00:13.1 USB controller [0c03]: Advanced Micro Devices [AMD] nee ATI SB7x0 USB OHCI1 Controller [1002:4398] 00:13.2 USB controller [0c03]: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB EHCI Controller [1002:4396] 00:14.0 SMBus [0c05]: Advanced Micro Devices [AMD] nee ATI SBx00 SMBus Controller [1002:4385] (rev 3a) 00:14.1 IDE interface [0101]: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 IDE Controller [1002:439c] 00:14.2 Audio device [0403]: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel HDA) [1002:4383] 00:14.3 ISA bridge [0601]: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 LPC host controller [1002:439d] 00:14.4 PCI bridge [0604]: Advanced Micro Devices [AMD] nee ATI SBx00 PCI to PCI Bridge [1002:4384] 00:14.5 USB controller [0c03]: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI2 Controller [1002:4399] 00:18.0 Host bridge [0600]: Advanced Micro Devices [AMD] Family 11h Processor HyperTransport Configuration [1022:1300] (rev 40) 00:18.1 Host bridge [0600]: Advanced Micro Devices [AMD] Family 11h Processor Address Map [1022:1301] 00:18.2 Host bridge [0600]: Advanced Micro Devices [AMD] Family 11h Processor DRAM Controller [1022:1302] 00:18.3 Host bridge [0600]: Advanced Micro Devices [AMD] Family 11h Processor Miscellaneous Control [1022:1303] 00:18.4 Host bridge [0600]: Advanced Micro Devices [AMD] Family 11h Processor Link Control [1022:1304] 01:05.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI RS780M/RS780MN [Mobility Radeon HD 3200 Graphics] [1002:9612] 08:00.0 Network controller [0280]: Broadcom Corporation BCM4322 802.11a/b/g/n Wireless LAN Controller [14e4:432b] (rev 01) 09:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller [10ec:8168] (rev 02)

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  • Building the Internet of Things – with Microsoft StreamInsight and the Microsoft .Net Micro Framework

    - by Roman Schindlauer
    Fresh from the press – The March 2012 issue of MSDN Magazine features an article about the Internet of Things. It discusses in depth how you can use StreamInsight to process all the data that is continuously produced in typical Internet of Things scenarios. It also gives you an end-to-end perspective on developing Internet of Things solutions in the .NET world, ranging from the .NET Micro Framework application running on the device, the communication between the devices and the server-side all the way to powerful cross-device streaming analytics implemented in StreamInsight LINQ. You can find an online version of the article here. Happy reading! Regards, The StreamInsight Team

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  • JavaOne - Java SE Embedded Booth - Servergy Micro Server

    - by David Clack
    Hi All,  So it's been awhile, I've been working with all the ARM and Power Architecture partners we have now on testing Java SE Embedded. We will have a Java SE Embedded for ARM and PPC at Java One next week, I'll be bringing in some of the great ARM and PPC systems to demonstrate.  The first system I'd like to tell you about is a really cool 8 core Power Architecture Micro Server from a company in Dallas called Servergy. Java One will be it's first public outing, Bill Mapp the CEO will be doing a talk at the Java Embedded @ JavaOne conference in the Hotel Nikko, right next door to the JavaOne show in the Hilton. To read more about Servergy https://www.linux.com/news/enterprise/cloud-computing/641488-linux-based-servergy-advances-data-center-efficiency http://www.servergy.com/ If you are registered at JavaOne you can come over to the Java Embedded @ JavaOne for $100 Come see us in booth 5605 See you there Dave

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  • Managing Kindle Fire with on 12.04 via Micro-USB

    - by pirtle
    To begin, I have read both Is there a way to get a Kindle Fire to work with 12.04? and How can I transfer files to a Kindle Fire with a Micro-USB cable? My problem is that I am unable to mount my Kindle Fire in order to add books to it. I have installed calibre, but it is unable to manage any devices until the computer itself has recognized it. The latter post had an excellent answer (provided by @jeremiah) that was making some progress. Unfortunately, I think I don't know enough about the -t flag used with mount. This is what I've done... Ran dmesg to locate the device: [ 3.920886] sd 6:0:0:0: [sdb] Attached SCSI removable disk Confirmed it's location: $ sudo ls -l /dev/disk/by-id lrwxrwxrwx 1 root root 9 Aug 18 15:52 usb-Amazon_Kindle_3C6C002600000001-0:0 -> ../../sdb So we know that my Kindle is recognized on /dev/sdb. I then used the mount command suggested by @jeremiah: $ sudo mount -t ext3 /dev/sdb/ /mnt/kindle/ mount: no medium found on /dev/sdb The same error occurs for sudo mount /dev/sdb /mnt/kindle. Note: I have created the 'kindle' directory in 'mnt' Any suggestions?

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  • What micro web-framework has the lowest overhead but includes templating

    - by Simon Martin
    I want to rewrite a simple small (10 page) website and besides a contact form it could be written in pure html. It is currently built with classic asp and Dreamweaver templates. The reason I'm not simply writing 10 html pages is that I want to keep the layout all in 1 place so would need either includes or a masterpage. I don't want to use Dreamweaver templates, or batch processing (like org-mode) because I want to be able to edit using notepad (or Visual Studio) because occasionally I might need to edit a file on the server (Go Daddy's IIS admin interface will let me edit text). I don't want to use ASP.NET MVC or WebForms (which I use in my day job) because I don't need all the overhead they bring with them when essentially I'm serving up 9 static files, 1 contact form and 1 list of clubs (that I aim to use jQuery to filter). The shared hosting package I have on Go Daddy seems to take a long time to spin up when serving aspx files. Currently the clubs page is driven from an MS SQL database that I try to keep up to date by manually checking the dojo locator on the main HQ pages and editing the entries myself, this is again way over the top. I aim to get a text file with the club details (probably in JSON or xml format) and use that as the source for the clubs page. There will need to be a bit of programming for this as the HQ site is unable to provide an extract / feed so something will have to scrape the site periodically to update my clubs persistence file. I'd like that to be automated - but I'm happy to have that triggered on a visit to the clubs page so I don't need to worry about scheduling a job. I would probably have a separate process that updates the persistence that has nothing to do with the rest of the site. Ideally I'd like to use Mercurial (or git) to publish, I know Bitbucket (and github) both serve static page sites so they wouldn't work in this scenario (dynamic pages and a contact form) but that's the model I'd like to use if there is such a thing. My requirements are: Simple templating system, 1 place to define header, footers, menu etc., that can be edited using just notepad. Very minimal / lightweight framework. I don't need a monster for 10 pages Must run either on IIS7 (shared Go Daddy Windows hosting) or other free host

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  • Understanding why a 450W power supply is destroying my ATX motherboards but not mATX

    - by T. Webster
    Maybe I'm missing something really obvious here, but after going through 3 new motherboards in trying to build my new machine, I'm finally certain that the 450W power supply I bought has been destroying them. It seems like it should be simple: just connect the connectors where they fit and switch the thing on. But today after hooking it to my ASUS Sabertooth 990FX TUF Series Motherboard and switching it on, I could see and smell the smoke coming out of the motherboard. What I don't get is why I can hook this same 450W power supply up to my mATX motherboard and not run into the same problem. What am I missing here? Where on the box or manual is this? (I have 8x2 GB RAM, AMD FX-4100 3.6GHz CPU, 1 512MB ATI graphics card, 1 WD 7200 RPM SATA hard drive. )

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  • Case for Micro SD card?

    - by Josh
    I have a MicroSD card which I'd like to keep with me at all times, I.E. in my wallet. I'm looking for a case for it. But all the cases I can find seem to be for standard SD cards... the closest I could find was this: Which is completly pointless, it stores the Micro SD card along with it's adaptor. Why not just put the Micro SD card IN the adaptor and store both on a normal SD card case... Anyway, does what I'm looking for (a case to protect a microSD card, and only large enough for a mircoSD card, i.e. not what's pictured above) exist?

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  • Amazon EC2- many micro-instances vs single small/medium instance

    - by shashankaholic
    I have a chat application using stack of Openfire, Tomcat6 and MySQL. Currently, i have installed all these servers on single Linux micro-instance(613 MB memory). Even in low user base 10-20 i am encountering CPU overload which is quite obvious here. As, i am new to Amazon EC2 can somebody suggest me how to scale up my architecture according to traffic use? should i use separate micro instances for every app server(openfire,mysql,tomcat6) should i use single small or medium instance for whole server stack. Some factors in context: high reliance on MYSQL high memory usage due to file transfer web-application interacting with other Amazon service like S3,SES

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  • Amazon EC2- micro-instance vs single small/medium instance

    - by shashankaholic
    I have a chat application using stack of Openfire, Tomcat6 and MySQL. Currently, i have installed all these servers on single Linux micro-instance(613 MB memory). Even in low user base 10-20 i am encountering CPU overload which is quite obvious here. As, i am new to Amazon EC2 can somebody suggest me how to scale up my architecture according to traffic use? should i use separate micro instances for every app server(openfire,mysql,tomcat6) should i use single small or medium instance for whole server stack. Some factors in context: high reliance on MYSQL high memory usage due to file transfer web-application interacting with other Amazon service like S3,SES

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  • micro-SD card initialization using SPI interface

    - by Ron
    I'm using a micro-SD card in an embedded design. The card is connected to a microcontroller using the SPI interface. It worked fine for all cards I've used before, but now my new card will not initialize. The card is a Transcend 2GB micro-SD card (TS2GUSD). After sending the initial clock train to switch to SPI mode I do the following: 1) CMD0 (Argument 0, CRC 0x95) - Response 0x01 - OK 2) CMD8 (Argument 0x000001AA, CRC 0x87) - Response 0x01 0x000001AA - Means it's SDC V2+ card, the Voltage range 2.7V~3.6V is supported - OK Then I should send the ACMD41 command, but when sending the CMD55 (argument 0, CRC 0) that must precede CMD41, I get response 0x05 - Illegal Command. I've also tried to send CMD1 (for MMC cards), but it gives a similar Illegal Command response. The code works fine with my Sandisk 2GB micro-SD card. Does anyone have any idea? Thanks, -Ron-

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  • Node app crashes after a while on micro EC2 instance even with supervisor

    - by Justin Meltzer
    I'm using supervisor to start my node.js application on a micro EC2 instance. However, the app only stays running for some time until it eventually shuts down. Not exactly sure how long the app stays running but I'm guessing for about a few hours or so. Sometimes less. My question is where on the remote server should I be looking in order to debug this kind of issue? I'm running an Amazon Linux AMI.

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