Nov 292012




SuperHouseTV Preparing for the Good Weekend photographer tomorrow. Got to resurrect some home automation bits that I’ve let stop working! 37 days ago · reply · retweet · favorite

SuperHouseTV And on the same topic, a script to republish MQTT messages from one topic to another for home automation:… 59 days ago · reply · retweet · favorite

SuperHouseTV Blog post about MQTT topics for home automation:… 59 days ago · reply · retweet · favorite

SuperHouseTV Setting an Arduino Ethernet MAC address automatically – great home automation system time saver:… 68 days ago · reply · retweet · favorite

SuperHouseTV We’re back! SuperHouse episode 4 is finally up: Making Home Automation Gear Run Quietly… #arduino 74 days ago · reply · retweet · favorite

SuperHouseTV After a long hiatus I now have 2 more episodes almost finished filming, next one up in a couple of days 80 days ago · reply · retweet · favorite

geekcowboy First entry up on new Arduino based home automation project.… 129 days ago · reply · retweet · favorite

SuperHouseTV @dippysan The UPS is for the Linux box, WiFi, switches, DSL modem, firewall, and VoIP adaptor. Keeps phone / net going in a blackout 150 days ago · reply · retweet · favorite

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 Posted by at 6:11 am
Nov 252012

Getting Started with the Stellaris EK-LM4F120XL LaunchPad Workshop

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Version 1.02 October 2012




Stellaris LaunchPad Board
Kentec LCD TouchScreen Display

The Getting Started with the Stellaris EK-LM4F120XL LaunchPad Workshop is a free, in-depth, hands-on introduction into Stellaris LM4F basics including:

  1. Introduction to the ARM® Cortex™-M4F and Peripherals
  2. Introduction to Code Composer Studio
  3. StellarisWare, Initialization and GPIO
  4. Interrupts and the Timers
  5. ADC12
  6. The Hibernation Module
  7. USB
  8. Memory
  9. The Floating-Point Unit
  10. BoosterPacks and the Graphics Library
 Posted by at 9:02 pm
Nov 242012

  contact     press     site map     disclaimer     INTERNAL  

Data Visualization

MPA Homepage > Scientific Research > Research Groups > Galaxy Formation > Data Visualization

Go to:

Large-scale structure
Clusters of galaxies
Flying through clusters
Flying through filaments
4D Universe
Flying through universe
Individual galaxies
Movie formats

3D-View of cosmic structure

Visualization of Computer Simulations:

On this page, you may download movies and images that we produced from our numerical simulations. You are welcome to use this material for illustrative purposes in talks or posters.

Note however that the selection below is not complete. Additional visualization material can be found on the pages that describe indididual projects in more detail, e.g.:

link The Millennium Simulation Project
link The Hubble Volume Project
link Intermediate-Scale Simulations
link Higher Resolution Simulations in smaller boxes

We have loosely grouped the available movies and images into different categories. Note however that both the simulation and visualization techniques employed in each case may vary widely within each category.

Also note that the images contained on this page are only a small selection from our pool of simulation pictures. Further material with more detailed explanations of the scientific background of each simulation can be found on the pages of individual projects.Copyright statement:

When material of this page is used, credit has to be given to the author(s) as well as to the Max-Planck-Institute for Astrophysics.

 Posted by at 9:24 pm
Nov 182012

Oscilloscope Simulation


Usage Hints

  • Operate the system as you would operate a real one. You can attach and detach signal cables.
  • Turn the oscilloscope on, before starting to measure.
  • If you own a sound card, turn your speakers on, because the simulation contains the original sounds of switches and wheels.

You only get the full functionality and the correct look if you observe the system requirements. Should the simulation not start or other errors occur, please read the frequently asked questions or send a problem report.

Download Time

  • with DSL approx. 10 s
  • with 2 ISDN channels approx. 40 s
  • with 56 K modem approx. 1 min. 30 s
  • with 28.8 modem approx. 3 min.


The oscilloscope simulation is no executable program, but an interactive computer movie based on Macromedia Shockwave. It is technically impossible that Shockwave movies copy malware to your computer.


The simulation is equipped with context-sensitive help. To obtain help for a button or wheel, doubleclick your mouse on the according element. You can read help files without starting the simulation.


Click here for a documentation of the project.

 Posted by at 9:24 pm
Nov 182012

This site is supported by donations to The OEIS Foundation.


(Greetings from The On-Line Encyclopedia of Integer Sequences!)

A002485 Numerators of convergents to Pi.
(Formerly M3097 N1255)
0, 1, 3, 22, 333, 355, 103993, 104348, 208341, 312689, 833719, 1146408, 4272943, 5419351, 80143857, 165707065, 245850922, 411557987, 1068966896, 2549491779, 6167950454, 14885392687, 21053343141, 1783366216531, 3587785776203, 5371151992734, 8958937768937, 139755218526789, 428224593349304, 5706674932067741, 6134899525417045 (list; graph; refs; listen; history; text; internal format)
 Posted by at 8:56 pm
Nov 092012


WebSDR at K7UEB Walla Walla University Club Station

This is a beta test WebSDR receiver, located at Walla Walla University, in College Place, Washington, on the West Coast of the USA. It is operated by Rob Frohne, KL7NA, e-mail my call sign at arrl dot net. The hardware consists of a three Softrock down converters (thanks to Tony, KB9YIG) which are fed into an M-Audio Delta 1010LT sound card on a Pentium III Dell computer.

The software is from PA3FWM, and is not released yet. More information about the WebSDR project can be found on

This receiver is tuned to two parts of the 20 meter amateur radio band. The frequencies from 14.150 to 14.200 often have US and foreign amateur operators. The frequencies between 14.100 and 14.200 are mostly Canadian and other foreign amateur stations. They are on upper sideband (USB). The frequencies from 14.000 MHz to 14.100 MHz are used for digital modes like CW, PSK31, RTTY, etc. The 40 meter receiver is tuned to the digital and foreign phone (voice) band, so you can hear a variety of types of signals there.

There is PSK Spotting software running using the same audio stream that you can listen to here.  If you look here, you can see a map with all the stations heard in the last 24 hours.
A brief description of the hardware and software used on this websdr server is here, for those interested.

The K7UEB club station is also used in WSPR, the Weak Signal Propagation Reporter Network. WSPR transmits a QRP signal during 2 minute windows approximately 3 to 4 times an hour. During these transmission windows, the websdr receivers experience intense interference. Go to the WSPR mapand enter the call “K7UEB” (TS-590S), “K7UEB/20” (20M SDR) or “K7UEB/40” (40M SDR) to see who we’ve spotted and who has spotted us.

Note: you need both Sun Java and JavaScript enabled for this page to work properly. If you don’t hear anything, probably Java is disabled or its version is too old (i.e., pre-1.4.2).  If you are using Ubuntu 10.10, in Synaptic you need to remove the icedtea6-plugin and install the sun-java6-plugin. If you would like sun-java6 to use pulseaudio on in Ubuntu 10.10, have a look at this page that also tells you how to use Fldigi and the Jack Audio Connection Kit to demodulate digital modes with websdr and Ubuntu 10.10.

Please log in by typing your name or callsign here (it will be saved for later visits in a cookie):


all bandsothers slowone bandblind


Frequency: kHzBand: 40m_cw 20m_cw 20m_ssb
Or tune by clicking/dragging/scrollwheel on the frequency scale.

Waterfall view:

Or zoom with scroll wheel on waterfall.
Move by dragging the waterfall with the mouse.

2.49 kHz @ -6dB; 2.95kHz @ -60dB.

Or drag the passband edges on the frequency scale.

Waterfall settings:

weak sigs
strong sigs


-66.4 dBm; peak   -62.5 dBm;


Call of station that you hear:
Comments, if any:

Note: time, frequency, your name/call, and DXCC information are added automatically.
To view the logbook, click here (ctrl-click for new tab/window).


This WebSDR is currently being used by 1 user(s) simultaneously:


 Posted by at 5:31 pm