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March 19 2009

gpn8-plakatvorschlag von max
Reposted fromneingeist neingeist

March 18 2009

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#freifunk #potsdam
Reposted frommoellus moellus

March 10 2009

Modular prototyping shields for Arduino


Stefan Hermann, a hardware hacker in Berlin, has come up with an interesting suite of plug-in sub-circuit prototyping modules for Arduino, called JEP ("Just Enough Prototyping") Shields.

JEP shields are complete circuits for Arduino microcontrollers. They are modular in construction such that the functionality of each can be stacked through pin headers.

Every JEP shield has its own patch panel - two rows of female pin headers, which give access to all Arduino pins. In/out pins of the JEP shields have their own screw terminals, providing a secure connection to peripheral components, like motors or sensors. Every shield has 3 onboard trimpots which can be used to calibrate sensors or digital inputs.

So far, Stefan has shields for FET-N (for juicing current and voltage on Ardunio projects when needed), Opto (3x Optocouplers), Relais (2x relays), Motor (2x motor drives), and Quadro-beta (4x motor drivers).

You can download the Eagle files now and Stefan will have boards available soon via Fritzing.

JEP Shields Introduction

MAKE: Blog: Modular prototyping shields for Arduino
Reposted fromjohl johl

March 02 2009

Reposted fromherrt herrt

February 26 2009

How-To Tuesday: Arduino 101 potentiometers and servo
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SAWstop - a guys puts a finger under a spining saw blade and it stops!
Koleś wsadza palec pod piłę, a ona się blokuje!
Reposted fromaleksandrowski aleksandrowski viaScytale Scytale

February 23 2009

Fritzing is an open-source initiative to support designers and artists to take the step from physical prototyping to actual product. We are creating this software in the spirit of Processing and Arduino, that allows the designer / artist / researcher / hobbyist to document their Arduino-based prototype and create a PCB layout for manufacturing. The complimenting website helps to share and discuss drafts and experiences as well as to reduce manufacturing costs.

February 22 2009

Klausuraufgabe in Foundations of Cognitive Science 2008

Die berühmten Mathematiker Carl Friedrich Gauß und Leonhard Euler landen nach ihrem Tod in der Hölle. Luzifer verspricht ihnen die Freiheit, wenn sie die beiden ganzen Zahlen zwischen 1 und 100 (d.h. im Bereich {2,3,…,99}) erraten, die er sich ausgedacht hat. Er nennt Gauß das Produkt und Euler die Summe der beiden Zahlen; darauf entwickelt sich zwischen den Mathematikern folgender Dialog:
Gauß: „Ich kenne die beiden Zahlen nicht.“
Euler: „Das war mir klar.“
Gauß: „Jetzt kenne ich die beiden Zahlen.“
Euler: „Dann kenne ich sie jetzt auch.“
Unabhängig von der Frage, ob Gauß und Euler aus der Hölle entkommen, lautet die Aufgabe, allein aus diesen Angaben die beiden Ausgangszahlen zu ermitteln.
Reposted fromszara szara viaclifford clifford

The WIRED CD of Creative Commons Music by well-known artists

David Byrne, Beastie Boys, Thievery Corporation, The Rapture, Matmos etc.

February 21 2009

Mit dem Rad auf den Spuren Schillers

Zwischen 17. Mai und 18. Oktober locken sechs Schiller-Radtouren. Auf der etwa 15 Kilometer langen Strecke vom Mannheimer Schloss bis zum Oggersheimer Schillerhaus erzählen der Leiter des Stadtmuseums sowie eine Mitarbeiterin der Reiss-Engelhorn-Museum Anekdoten über den Schriftsteller, dessen "Räuber"-Uraufführung am Mannheimer Nationaltheater 1782 begeistert aufgenommen worden war.

Selten dürfte der Arbeitsrechtstag an der Mannheimer Universität auch bei Laien so viel Aufsehen wie in diesem Jahr erregt haben. Grund ist ein Thema der Tagung: Mitarbeiterkontrolle - Wie weit darf der Arbeitgeber gehen? Nach zahlreichen Datenskandalen bei Telekom, Bahn und anderen Unternehmen befassen sich nun Juristen aus Wissenschaft und Praxis mit dem heiklen Vorgehen in Unternehmen. Auf der Tagesordnung der Konferenz am 11. März in der Universität stehen etwa die strafrechtliche Haftung von Führungskräften oder Gesetzestreue als psychologisches Problem.

Professor Frank Maschmann, Direktor des Instituts für Unternehmensrecht der Universität Mannheim, wird zum brisanten Thema "Mitarbeiterkontrolle und private Ermittlungen" referieren. Infos zu der Fachtagung gibt es im Internet unter

Mannheimer Morgen

February 20 2009

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Mini gauss gun

Review: Testing Sanyo's Eneloop Low Self-Discharge Rechargeable Battery

Late in 2006, I found out about Sanyo's new Eneloop Nickel Metal Hydride (NiMH) rechargeable batteries, available in AA and AAA cell sizes. Unlike regular NiMH offerings from other vendors (e.g. Duracell, Energizer, Gold Peak), Sanyo claimed the following benefits for their Eneloops:

  • Very low self-discharge rate, meaning one can charge them any time, store them until needed, and then use them.
  • Because of the previous characteristic, Sanyo sells them pre-charged, so one doesn't have to charge them before their first use.
  • Lower internal resistance, meaning higher voltage reaching equipment that uses high currents (such as digital cameras).

One apparent disadvantage of the Eneloops over normal NiMH cells is lower capacity. For the AA size, Sanyo claims a capacity of 2000mAh. Normal NiMH AAs are available with capacities of up to 2700mAh nowadays, but when you consider self-discharge rate, such NiMH cells stored for about 30 days will drop to 2000mAh.

BattMan II: A Computer Controlled Battery Manager

BattMan II is a computer controlled battery manager, intended for typical rechargeable batteries used by R/C and electronics hobbyists, as well as various consumer product batteries. BattMan II has the following capabilities:
  • Works with Nickel-Cadmium (NiCd), Nickel-Metal-Hydride (NiMH), Lithium-Ion (Li-Ion), Lithium-Polymer (LiPo), Lithium-Nano-Phosphate (LiNP), and Lead-Acid (Pb-Acid) batteries of 1.2 to 14.7 Volts.†
  • Discharges batteries to measure capacity at rates of 130mA to 2A.
  • Charges at rates of 130mA to 1.3A.†
  • Automatically performs repeated discharge/charge cycles to break in new batteries, or erase NiCd voltage depression in old ones.
  • Measures internal resistance.
  • Monitors self-discharge.
  • Real time graphical display lets you see problems like mismatched cells.
  • Keeps a log of all operations performed, which can be imported into any spreadsheet program.
  • Saves graphs of charge, discharge, auto-cycle, and monitor operations.
  • Connects via parallel port to any PC running Microsoft Windows (95, 98, ME, 2000, XP, or Vista).††
  • Operating software, complete with source code, is available to download.

NiMH and NiCd Battery Charger

I'm always complaining about all the chargers and wall warts I need to carry with me when going on a trip. This project, which can charge a pair of AA Nickel Metal Hydride (NiMH) or Nickel Cadmium (NiCd) cells using a laptop's USB port for power, arose to address part of that problem. (By the way, if you want to lighten your laptop load, take a look at the MoGo Mouse.)

Any USB port can supply 5V at up to 500mA. The USB standard specifies that a device may not use more than 100mA until it has negotiated the right to use 500mA, but apparently no USB ports enforce that requirement. This makes the USB port a convenient source of power for devices such as this charger.

There are commercially available USB AA charging solutions available, but they each have some drawbacks:

  • The USBCell is a 1300mAh AA NiMH cell with a removable top that allows it to be plugged directly into a USB port. No separate charger is needed. Unfortunately, the cell capacity is very low (most NiMH AA cells are 2500mAh these days), and each cell requires its own port.

  • There is a two cell USB powered AA charger available, sold under a variety of names, but it charges at a very low 100mA rate. The distributor calls it an "overnight charger", but at 100mA, a 2500mA cell would take about 40 hours to charge (40 instead of 25 due to the inefficiencies of charging at low currents).

  • I found a 2/4 cell charger that can be powered by a USB port, auto adapter, or wall wart, but it is as large as the wall charger I'm trying to replace. Different ones can be found here and here, but these take 10 to 12 hours to charge 2500mAh cells.

DIY 1980’s Supercomputer


I’ve always wanted my own supercomputer. Let’s be honest, what self-respecting geek doesn’t? Unfortunately, I’m usually poor, and I live in a space that’s ~300 ft^2 (that I share with someone else), so actually owning anything considered a super is out of the question. Fortunately, “Supercomputers” from the 1980’s weren’t actually all that complicated, and cheap FPGA boards have gotten pretty good. On that note, crank up the Devo and check out the Non-Von1.

Reposted fromnycresistor nycresistor

February 19 2009

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We introduce Plushie, an interactive system that allows nonprofessional users to design their own original plush toys. To design a plush toy, one needs to construct an appropriate two-dimensional (2D) pattern. However, it is difficult for non-professional users to appropriately design a 2D pattern. Some recent systems automatically generate a 2D pattern for a given three-dimensional (3D) model, but constructing a 3D model is itself a challenge. Furthermore, an arbitrary 3D model cannot necessarily be realized as a real plush toy, and the final sewn result can be very different from the original 3D model. We avoid this mismatch by constructing appropriate 2D patterns and applying simple physical simulation to it on the fly during 3D modeling. In this way, the model on the screen is always a good approximation of the final sewn result, which makes the design process much more efficient. We use a sketching interface for 3D modeling and also provide various editing operations tailored for plush toy design. Internally, the system constructs a 2D cloth pattern in such a way that the simulation result matches the user's input stroke. Our goal is to show that relatively simple algorithms can provide fast, satisfactory results to the user whereas the pursuit of optimal layout and simulation accuracy lies outside this paper's scope. We successfully demonstrated that non-professional users could design plush toys or balloon easily using Plushie.

via Plushie:An Interactive Design System for Plush Toys
Reposted byInte Inte

oqlt creative commons collection #1

01. Pornophonique :: Sad Robot :: 05:19
02. JAMMIN*INC :: Was ist härter v2.0 :: 03:53
03. Shearer :: Overstock :: 02:51
04. cre8radix :: Haus No. 1 :: 04:30
05. Börgerding :: Niemals allein :: 03:31
06. Kraftfuttermischwerk :: Der blaue Daumen :: 06:32
07. Chinese Whisper :: Last train :: 04:28
08. Trundicho :: Results :: 05:10
09. Cellard'or :: Scheinwelt :: 04:47
10. Recepteur Mondial :: Enter when ready :: 03:37
11. Shearer :: Stay with me :: 07:12
12. Velvet June :: Still :: 02:43
13. Pornophonique :: Rock'n'Roll Hall of Fame :: 04:08

via oqlt_creative_commons_collection_1 (download torrent) - TPB
Reposted byInte Inte

February 18 2009

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