Raspberry Pi Forums

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ahmedwahdan, I am assuming the following: 1) In the end you will have your sensors connected to a Pi via serial port. Or perhaps even the GPIO/I2C/SPI on the GPIO header. 2) The Pi will be your server. That is for web pages and other connections from your mobile phone (or other) apps. 3) You are usi...

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miker00lz, I've got my raspi running at 1.0 GHz CPU, 500 MHz SDRAM clock, overvolt is set to 6. I'm using force_turbo as well. It's totally stable, I have QEMU running on it right now. Windows Server 2003 guest OS installed, and it's been running perfectly with a full-time 100% CPU load for 2 days. ...

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I installed qemu on my quadcore Intel PC and used to to run Raspian which was then used to compile a rather large project. Turned out to take about the same time as on the Pi itself. About 12 hours in this case.

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stevech, object oriented programming leads to code size bloat. No it does not. Or at least it need not. This is a common myth. If you need multiple instances of something, for example a buffer, you can write that in C using pointers to your select which of your various buffers you are working on. Yo...

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Is it normal for a full up Linux running computer costing 48 Euro (A rather high off the shelf price in my local store), consuming only 1 Watt and being the size of a credit card to be able to calculate a million digits of Pi in 17 seconds?

That's a first in my experience.

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In what way is Raspian "laggy". It performs as well as I expect for a 700Mhz machine using SD card storage. I only ever use it from the command line via ssh though.

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Speed is not everything. For most of what I do with a Pi or other ARM boards they are all plenty fast enough. I bet this is true for most apps of most users. At that point the price, the design stability and the community become far more valuable than raw speed. The 200 Euro ARM board I mentioned do...

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Jim, If you look at an old tube flip-flop as used in you basic memory or counter circuit you find it is made of two triodes. Linking such tube flip-flops together in counter or other circuits required capacitor coupling. I think it's impossible to build a flip-flop with only two active components wi...

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ahmedwahdan, To get you started with node.js client/server programming here is an example I created for myself a little while ago as I was getting into how to make TLS work. The point here is actually the script that generates all the SSL certificates and keys. I had a devil of a job getting that ri...

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caljustcal ...because apparently you can! Where on earth did you get that idea from? I would suggest that if you have a Raspberry Pi you already have a enough of a game learning the ins and outs of the Pi and Linux and programming and making your own games. It's infinitley more fascinating and rende...

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OtherCrashOverride, ...webserver, JavaScript, XML/JSON, SSL, AJAX seem like a Rube Goldberg machine...to me. You know what? I agree. The whole web stack looks like something Heath Robinson would have devised http://en.wikipedia.org/wiki/W._Heath_Robinson . (Being British I have to mention we got the...

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OtherCrashOverride, Seems like a bit overkill. You can talk to GPIO, serial port, and network sockets without ever leaving the language he already knows: C Yes, you can do serial port. GPIO, and network sockets in C. I have done so myself a few times in the past. Of course you can do pretty much any...

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One way to do this is to get your self the live CD version of GParted. http://gparted.sourceforge.net/livecd.php which you may find comes in very useful for other jobs as well in the future. So what you do is: 1) Get a 16GB card and write your 8GB image to it. 2) Make sure it boots on a Pi but do no...

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OK good. So we have: 1) Read RFID tag and GPS coordinates from serial 2) Send it over internet to android mobile APP 3) Use a Raspberry Pi (or not)? If you know C you can pick up JavaScript very easily. Sounds crazy but one of the easist ways to get web things working is via JavaScript. Not running ...

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ahmedwahdan, What subject are you hoping to graduate in, and at what level? How long have you got to complete this project? From the nature of your question it seems you know nothing of programming, and by implication nothing about serial communication, network and especially web protocols, client s...

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I'm not an educator but having been hanging around varius technical forums for years I have see many questions pop up that are obviously homework problems. This issue gets even more interesting when you are on a forum that is clearly of an educational bias like this one or say the Parallax Inc. foru...

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I suggest all us Pi users stick to the good old stand by browser: https://en.wikipedia.org/wiki/Lynx_%28web_browser%29

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Yep. This issue of caching has a point though. As far as I can tell my browsers keep a copy of every page visit in cache for a quick redraw without reload when I go backwards and such. Of course that perhaps ends up being slower than downloading the whole thing again if you storage media is slow and...

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Here we have Firefox loading a more normal page: 18385 michael 20 0 1016m 313m 21m R 18.5 11.3 28:45.33 firefox 2406 root 20 0 227m 67m 8484 S 2.0 2.4 262:17.95 Xorg Clearly Xorg is not the major culprit in page rendering sluggishness on Linux. 2 percent of CPU vs 20 odd percent for Firefox.

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gkreidl, There are 2 things, that make browsing slow on the RPi:...xorg...javascript... Actually that is not true. Just now I'm logged into my Linux PC whilst someone is playing FarmVille. Here is what I see: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 18424 m 20 0 2860m 1.5g 17m R 90.5 55...

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As far as I know web browsers on the PC and the like are not GPU accelerated either. Except when it comes to things like webgl which are not very common. It is unlikely that a GPU would help rendering a typical web page or speed up the JavaScript in anyway. At some point you have to accept that the ...

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If I wanted to move files from the Pi to a server I would run an ssh server on the server and use scp from the Pi:

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$ scp file_name user_name@server_address:some_directory

FTP is not secure.

Or do you mean to uplload files from a web page using web protocols and the webserver?

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So it was a Windows problem. No wonder we had no idea about it.

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Debian and hence Raspian are generally not using the latest version of anything. It takes time for someone to build the packages and then there has to be a lot of testing before it gets into the distro. Debian values stability over "freshness". Firstly, are you sure you need a newer version? Does it...

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Pixel, I did not mean to be so negative. It's just that I have spend hundreds of hours fighting with setting up cross compilers for various platforms over the years, including ARM, sometimes you just have to as the target device does not have the OS or memory whatever to compile stuff for itself. I ...

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