ACTA 22 march 2010 stakeholder meeting 6/10 franz schaefer 2010-03-23 | ACTA 22 march 2010 stakeholder meeting 6 of 10 next 7/10: http://www.youtube.com/watch?v=x3liZkzxLO4 playlist with all 10 parts: http://www.youtube.com/watch?v=ISisp_jryrw&feature=PlayList&p=BC572BBD0DA4C088
05 - The Infinite Grid of 1 Ohm Resistors - Chapter 5: Two ways of Numpy Simulation franz schaefer 2024-02-15 | Playlist: The Infinite Grid of 1 Ohm Resistors: youtube.com/playlist?list=PLoGRr8ff1uXESrWh6z0BNTYpc4Y-hlBOmChapter V - Numeric Simulation of a Finite Grid in Numpy* Why Python, Why Numpy?* Basics of Working with Numpy* Slicing* Iterative Solution with Relaxation Method* Solution with Sparse Matrix AlgebraDetailed Material: gitlab.com/mooond/grid-of-1ohm-resistorsgitlab.com/mooond/grid-of-1ohm-resistors/-/blob/main/notebooks/resnetnum.ipynb?ref_type=headsgitlab.com/mooond/grid-of-1ohm-resistors/-/blob/main/notebooks/1ohmrelax.py?ref_type=headsgitlab.com/mooond/grid-of-1ohm-resistors/-/blob/main/notebooks/1ohmsparse.py?ref_type=heads
04 - The Infinite Grid of 1 Ohm Resistors - Chapter 4: The Integral franz schaefer 2024-02-04 | Playlist: The Infinite Grid of 1 Ohm Resistors: youtube.com/playlist?list=PLoGRr8ff1uXESrWh6z0BNTYpc4Y-hlBOmChapter IV - Solving the Integral* Solving the Integral* Calculating a Resistance from its NeighborsDetailed Material: gitlab.com/mooond/grid-of-1ohm-resistors
03 - The Infinite Grid of 1 Ohm Resistors - Chapter 3: Finding the Solution with a Fourier Series franz schaefer 2024-01-28 | Chapter 3 - Finding a Solution for the Infinite Grid of Resistors with Fourier SeriesSolutions of differential equations instead of difference equations. Why is it easier?What is a Green's Function and why do we want one?Constructing the Green's Function for our EquationCalculating the Resistance from the Potentialgitlab.com/mooond/grid-of-1ohm-resistorsPlaylist: youtube.com/playlist?list=PLoGRr8ff1uXESrWh6z0BNTYpc4Y-hlBOm
02 - The Infinite Grid of 1 Ohm Resistors - Chapter 2: Generating Functions, Z-Transform franz schaefer 2024-01-27 | From our original problem: Finding the Resistance of the diagonal points in an infinite grid of 1 Ohm resistors we found that we need a method to solve difference equations. For this we are looking into Generating Functions and Z-Transform:Topics Covered Here are:Chapter II - Taming Infinity with Generating Functions, Z-TransformThe equations for our Infinit Grid of ResistorsThe discrete laplacianHow to solve 1 dimensional difference equationsExample: Fibonacci NumbersPowerful Tools: Generating Functions and Z-TransformTrigonometric Functions as SolutionsThe Characteristic PolynomialOur Resistor Network in 1D2D Generating FunctionsMore Info:gitlab.com/mooond/grid-of-1ohm-resistorsPlaylist:youtu.be/org8stfCObw?si=wYHotnZEeU4Y3Rui
01 - The Infinite Grid of 1 Ohm Resistors - Chapter 1: Basics of Electricity and Electric Resistance franz schaefer 2024-01-21 | Chapter I - Electrical Resistance and Simple Electrical NetworksBasics of Electricity: Voltage, Potential, CurrentResistors: Ohm's LawConnecting Multiple Resistors togetherKirchhoff's LawMore Complicated Resistor NetworksThe Superposition PrincipleAn easier Infinite Network of ResistorsThe Infinite Grid - Our First VictoryPlaylist: youtube.com/playlist?list=PLoGRr8ff1uXESrWh6z0BNTYpc4Y-hlBOmGitlab: gitlab.com/mooond/grid-of-1ohm-resistors
00 - The Infinite Grid of 1 Ohm Resistors - Chapter 0: Motivation and Overview of Upcoming Videos franz schaefer 2024-01-21 | Playlist: youtube.com/playlist?list=PLoGRr8ff1uXESrWh6z0BNTYpc4Y-hlBOmA while ago while I helped my son to study for an electrical engineering test and explained to him how to calculate the electrical resistance in some network of resistors.At some point I remembered what I heard some 40 years ago when I was studying this myself: That if you build an infinite grid of electrical resistors that the resulting resistance between two digonal points is2/π ΩSo I started to google around on how this could be calculated. It turns out that with a simple trick it is easy to calculate the resistance between 2 nearby points. The resistance is just0.5 ΩBut that the diagonal case is much harder and there where no real good explaination online on how to calculate it. So this is here to fill in the gap and I will try to provide an understandable explainations for the complicated calculation. If you do not know much about electrical resistance or advanced mathematics you should still be able to follow it. Even if you are not so interested in the electrical aspects: There are plenty of pure math aspects and many of the tools here have some use in many other fields as well.E.g. The same equations are used to approximate many other physical problems, e.g. heat equations or electrostratics. Also the same equations are used in computer graphics for dedection of edges in pictures. So it should be useful.Along the way I hope to be able to provide you with everything you will need. I want to provide a video with some nice animation and a python-jupyter notebook with some python code.Chapter I - Electrical Resistance and Simple Electrical NetworksBasics of Electricity: Voltage, Potential, CurrentResistors: Ohm's LawConnecting Multiple Resistors togetherKirchhoff's LawMore Complicated Resistor NetworksThe Superposition PrincipleAn easier Infinite Network of ResistorsThe Infinite Grid - Our First VictoryChapter II - Taming Infinity with Generating Functions, Z-TransformThe equations for our Infinite Grid of ResistorsThe discrete LaplacianHow to solve 1 dimensional difference equationsExample: Fibonacci NumbersPowerful Tools: Generating Functions and Z-TransformTrigonometric Functions as SolutionsThe Characteristic PolynomialOur Resistor Network in 1DChapter III - Finding a Solution for the Infinite Grid of Resistors with Fourier SeriesSolutions of differential equations instead of difference equations. Why is it easier?What is a Green's Function and why do we want one?Constructing the Green's Function for our EquationCalculating the Resistance from the PotentialChapter IV - Solving the IntegralSolving the IntegralCalculating a Resistance from its NeighborsBonus: Chapter V - Numeric Simulation with Python NumpyFind More Info ongitlab.com/mooond/grid-of-1ohm-resistors
zumarsch zum 1. Mai 2023 - Poldi - KPÖ-Leopoldstadt franz schaefer 2023-04-19 | poldi.leopoldstadt.net/p/article802.htmlTreffpunkt: 8:45 Ecke Praterstraße/Novaragasse.Wir starten ab 9h mit einer Zumarsch-Demo über Rotensterngasse-Taborstraße-Schwedenplatz-Rotenturmstraße-Stephansplatz-Kärtnerstraße-Albertina. Dort ist die Zusammenkunft mit der großen 1. Mai-Demonstration am Ring.Gerade in diesen Zeiten ist Widerstand enorm wichtig. Kämpfen wir gemeinsam und feiern wir den Feiertag aller lohnarbeitspflichtigen Menschen mit Forderungen zu einem besseren Leben!#poldi#kpö#1mai#wien#1mai2023#Leopoldstadt
Average Distance between 2 Points in a Circle - Exact Solution via sympy franz schaefer 2023-03-04 | Average Distance between 2 Points in a CircleAlso see: youtube.com/watch?v=gCgE07fKQpYDownload the notebook from:gitlab.com/mooond/pystuff/-/blob/master/avgdist/avgdist2.ipynb
Add Another Client in Matrix Chat and Transport The Keys for End-to-End Encryption to the new Client franz schaefer 2023-02-02 | Since often new users have problmes with this:How to add Encryption Keys When You Join additional Clients with Matrix Chat #matrix #matrixchat #riot #privacy #encryption
UFO Landet im Bednar Park (Wien) franz schaefer 2019-04-01 | UFO landet kurz im Park und fliegt dann wieder weg!
Hover Puck (Air Hockey Puck - play air hockey on any surface) franz schaefer 2018-08-19 | Another Video of our Air Hockey Puck: youtu.be/Fehrh-N-09othingiverse.com/thing:3055842
Hover Puck (Air Hockey Puck provides its own Air) franz schaefer 2018-08-19 | 3D Printed design of a Air Hockey Puck with integrated ventilation.Bring your old quadcopter motors to a new live.thingiverse.com/thing:3055842Designed and invented by my 11 year old son.
Fun with GNU Radio (free SDR) and an Oscilloscope franz schaefer 2015-11-15 | A tutorial on how to generate lissajous paterns on your Oscilloscope. Using a soundcard and GNU-Radio to generate to sine waves.
Arduino based DIY game console franz schaefer 2015-09-19 | Built with an arduino nano clone and a 12864 oled display sku145210 (4pin). Power supply is made with 3 AAA rechargeable battery connected to the 5V input and a transistor and a small speaker for the sound.code: http://mond.at/~schaefer/arduino/console-nano-pong.tgz
XavBot an Arduino Robot with HC-06 Bluetooth franz schaefer 2014-11-24 | Robot Chassis: SKU115409 € 8.90L298N Dual H Bridge: SKU113918 € 2.75Arduino Nano Clone: SKU147298 € 2.78HC-06 Bluetooth Transceiver: SKU106868 € 4.70Mini Breadboard: SKU: SKU047552 € 1.29total: ca € 20.--Source Code: git clone http://mond.at/git/xavbotcontrolling works best with this android app: play.google.com/store/apps/details?id=eu.jahnestacado.arduinorc&hl=en
SNAP! and BrickPi (Raspberry Pi with Lego) Music franz schaefer 2014-09-05 | Almost a theremin. Made with Lego NXT ultrasonic sensor and brickpi and Berkeley SNAP!Code At: http://mond.at/~schaefer/snapbrick.tgzBerkeley Snap: http://snap.berkeley.edu/BrickPi: http://www.dexterindustries.com/BrickPi
brickPi in action (raspberry pi with brickPi) franz schaefer 2013-11-29 | Raspberry pi with lego. Our 1st experiment.
Lego machine which changes its own direction franz schaefer 2012-12-26 | Lego machine that changes its own running direction. This is our first machine (besides a small car). I was curious whether or not the thing could change its own running direction. The tricky part is that it needs to have enough momentum to switch over the middle position (where the current is turned off). But we got it right the first time. enjoy. xaver & mond.
ACTA 22 march 2010 stakeholder meeting 9/10 franz schaefer 2010-03-23 | ACTA 22 march 2010 stakeholder meeting 9 or 10 next 10/10 (last): http://www.youtube.com/watch?v=dZpExASESI playlist with all 10 parts: http://www.youtube.com/watch?v=ISisp_jryrw&feature=PlayList&p=BC572BBD0DA4C088
ACTA 22 march 2010 stakeholder meeting 10/10 franz schaefer 2010-03-23 | ACTA 22 march 2010 stakeholder meeting part 10 of 10 first 1/10: http://www.youtube.com/watch?v=ISisp_jryrw playlist with all 10 parts: http://www.youtube.com/watch?v=ISisp_jryrw&feature=PlayList&p=BC572BBD0DA4C088
ACTA 22 march 2010 stakeholder meeting 8/10 franz schaefer 2010-03-23 | ACTA 22 march 2010 stakeholder meeting 8of 10 next 9/10: http://www.youtube.com/watch?v=NxajcQTPMMY playlist with all 10 parts: http://www.youtube.com/watch?v=ISisp_jryrw&feature=PlayList&p=BC572BBD0DA4C088 playlist with all 10 parts: http://www.youtube.com/watch?v=ISisp_jryrw&feature=PlayList&p=BC572BBD0DA4C088
ACTA 22 march 2010 stakeholder meeting 7/10 franz schaefer 2010-03-23 | ACTA 22 march 2010 stakeholder meeting 7 of 10 next 8/10: http://www.youtube.com/watch?v=ldqDPpfSQBU playlist with all 10 parts: http://www.youtube.com/watch?v=ISisp_jryrw&feature=PlayList&p=BC572BBD0DA4C088
ACTA 22 march 2010 stakeholder meeting 5/10 franz schaefer 2010-03-23 | ACTA 22 march 2010 stakeholder meeting 5of 10 next 6/10: http://www.youtube.com/watch?v=fQbjRIKp5sY playlist with all 10 parts: http://www.youtube.com/watch?v=ISisp_jryrw&feature=PlayList&p=BC572BBD0DA4C088
ACTA 22 march 2010 stakeholder meeting 4/10 franz schaefer 2010-03-23 | ACTA 22 march 2010 stakeholder meeting 4 of 10 next: 5/10: http://www.youtube.com/watch?v=SPPim04vVXs playlist with all 10 parts: http://www.youtube.com/watch?v=ISisp_jryrw&feature=PlayList&p=BC572BBD0DA4C088
ACTA 22 march 2010 stakeholder meeting 1/10 franz schaefer 2010-03-23 | ACTA 22 march 2010 stakeholder meeting 1 of 10 next http://www.youtube.com/watch?v=LCa52Wnz8JU playlist with all 10 parts: http://www.youtube.com/watch?v=ISisp_jryrw&feature=PlayList&p=BC572BBD0DA4C088
ACTA 22 march 2010 stakeholder meeting 3/10 franz schaefer 2010-03-23 | ACTA 22 march 2010 stakeholder meeting 3 of 10 next 4/10: http://www.youtube.com/watch?v=T2IVRNCPsP8 playlist with all 10 parts: http://www.youtube.com/watch?v=ISisp_jryrw&feature=PlayList&p=BC572BBD0DA4C088
ACTA 22 march 2010 stakeholder meeting 2/10 franz schaefer 2010-03-23 | ACTA 22 march 2010 stakeholder meeting 2 of 10 next 3of10: http://www.youtube.com/watch?v=DeR4zEibokI playlist with all 10 parts: http://www.youtube.com/watch?v=ISisp_jryrw&feature=PlayList&p=BC572BBD0DA4C088
