Oct 112019
 
Key debouncing and scanning - sophisticated

Keyboard Matrix Scanning and Debouncing About Untz (USB DAC + Amp) Keyboard Matrix Scanning and Debouncing ON 2016-06-03 BY SUMMIVOX Intro Without diving into the “why” part, I wanted to make yet another keyboard with Cherry MX keyswitches (just like everyone else these days), and I ended up deciding to make my own keyboard controller (again like everyone else). After all… […]

 Posted by at 4:28 pm
Oct 112019
 

https://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv021.cgi?read=242802   Re: HELP WANTED ON ALGORITHMS Message #19 Posted by Eric Smith on 27 Apr 2013, 12:49 p.m., in response to message #18 by Eddie W. Shore Usually CORDIC isn’t used for logs and exponentials, although it is possible to do so by using hyperbolic CORDIC. CORDIC is in the general class of shift-and-add algorithms, and […]

 Posted by at 6:04 am
Oct 072019
 
Keisan Online Calculator Casio

https://keisan.casio.com/calculator Welcome, Guest User registration Login Service How to use Sample calculation Smartphone Japanese Life Education Professional Shared Private Column Advanced Cal Advanced Calculator    Function list  Input data storage  Expression Mode Digit Answer  Accuracy Comma format Real DEGReal GRAReal RADComplex RAD 61014182226303438424650545862667074788286909498102106110114118122126130 StandardExponent EditorAceTextarea   (-6.2 -7.6i)! How to use    Sample calculation    Sample chart       Answer ans1 […]

 Posted by at 10:42 am
Aug 192019
 
Lup Yuen - IoT Sensor Network — STM32 Blue Pill + nRF24L01 + ESP8266

https://medium.com/@ly.lee/build-your-iot-sensor-network-stm32-blue-pill-nrf24l01-esp8266-apache-mynewt-thethings-io-ca7486523f5d Mythical sonorous creature for belly illustration purpose only. Not required for implementation. Do not attempt to catch! Build Your IoT Sensor Network — STM32 Blue Pill + nRF24L01 + ESP8266 + Apache Mynewt + thethings.io Lup Yuen Lee 李立源 Follow May 27 · 18 min read Law of Thermospatiality: Air-conditioning always feels too warm ANDtoo cold by different individuals in a sizeable […]

 Posted by at 6:48 am
Aug 042019
 
History of Mechanical Calculators

http://www.xnumber.com/xnumber/cmhistory.htm  History of Mechanical Calculators  A Brief History of Mechanical Calculators James Redin From the Abacus to the electro-mechanical calculators. (Parts I, II and III) Part I The Age of the Polymaths Part II Crossing the 19th Century Part III Getting Ready for the 20th Century

 Posted by at 6:56 am
Aug 042019
 
Mechanische Rechenmaschinen

http://www.rechenautomat.de/ Von Halbautomaten, Rechen-Vollautomaten und Speicher-Superautomaten Mechanische Rechenmaschinen Bilder und Aufsätze zur Automatisierung der mechanischen Rechentechnik “Ein Automat (griech.) ist im weitern Sinn jede sich selbst bewegende mechanische Vorrichtung, die durch im Innern verborgene Kraftmittel (Federn, Gewichte etc.) in Bewegung gesetzt wird, z. B. Uhren, Planetarien u. dgl.; im engern Sinn ein mechanisches Kunstwerk, welches […]

 Posted by at 6:52 am
Aug 012019
 
CAS

http://user.mendelu.cz/marik/akademie/index.php#maxima Využití systémů počítačové algebry (CAS) v matematice (stará verze) Úvod Maxima  Sage  WolframAlpha  MAW  Všechno Pomoc Základní informace Ukázky jsou roztříděny podle typů úloh. V každé úloze jsou ikonky programů, které jsou použity pro řešení této úlohy. Příkazy a odkazy na výpočet se zobrazí po rozbalení každého příkladu kliknutím na zadání. Základy práce

 Posted by at 6:23 pm
Jul 032019
 
Pi in fractions (103993/33102) by Marchant

(best my Marchant from Robert Mařík) Pi= 3.141592653589793238462643383279502884197169399375105820974… 22/7 = 3,14… 22/7-Pi = 0.0012644892673496186802137595776400046…   355/113 = 3.141592… 355/113-Pi = 2,667641e-7   103993/33102 = 3.141592653… 103993/33102 -Pi = -5,77890… e-10     \\\\\\\\\\\\\\\\   http://qin.laya.com/tech_projects_approxpi.html Fractional Approximations of Pi After reading the American Scientist article, On the Teeth of Wheels, which describes the intricate interplay between pure and applied […]

 Posted by at 3:56 pm
Jun 202019
 
Abraham Jakub Stern - 4 function + root

https://polska.pl/science/famous-scientists/abraham-stern-17691842-does-anyone-have-calculator/ Home Dreamers People Internet Modern CPU Calculating Tools Mechanical Calculators Babbage Portrait of Abraham Stern (with one of his calculating machines) from 1823, artist Jan Antoni Blank The problem with the world is that the intelligent people are full of doubts, while the stupid ones are full of confidence. Charles Bukowski Abraham Jakub Stern […]

 Posted by at 4:52 am
Jun 072019
 
Who Invented the Microprocessor?

https://www.computerhistory.org/atchm/who-invented-the-microprocessor/ Who Invented the Microprocessor?  David Laws Sep 20, 2018 Curatorial Insight, Remarkable People Intel Pentium microprocessor die and wafer The microprocessor is hailed as one of the most significant engineering milestones of all time. The lack of a generally agreed definition of the term has supported many claims to be the inventor of the microprocessor. The original […]

 Posted by at 6:15 pm
May 242019
 
Ronald Dekker Flyback Converters

https://www.dos4ever.com/flyback/flyback.html Flyback Converters for Dummies A simple flyback converter high voltage power supply for NIXIE tubes. Ronald Dekker Special thanks to Frans Schoofs, who really understands how flyback converters work introduction What you need to know about inductors The boost converter A simple boost converter high voltage supply for NIXIEs An inductor test bench What […]

 Posted by at 5:42 am
May 202019
 
THE ON-LINE MUSEUM RechenMaschinen, RechenStäbe,

http://public.beuth-hochschule.de/~hamann/ Prof. Dr.-Ing. Christian-M. Hamann ( verantwortlich für den Inhalt dieser HomePage ) Spezialgebiete: ( ehem. Leiter des Labors für Künstliche Intelligenz ) LISP & PROLOG Anwendung Expertensysteme Evolutionsstrategien & Genetische Algorithmen Simulation Neuronaler Netze Positionale Logische Algebra Fuzzy-Logik OVER 777 HISTORICAL/TECHNICAL OBJECTS TO EXPLORE … THE ON-LINE MUSEUM RechenMaschinen, RechenStäbe, … , SchreibMaschinen, Telefone, Uhren […]

 Posted by at 6:10 am
May 202019
 
The Babbage engine - CHM

https://www.computerhistory.org/babbage/howitworks/   Welcome Overview History The Engines How it Works Key People A Modern Sequel How it Works e menu © Computer History Museum | Credits

 Posted by at 6:03 am
May 082019
 

http://www.azillionmonkeys.com/qed/sqroot.html √Square Roots © Copyright 1996-2006 by Paul HsiehEverything you ever wanted to know about square roots, but were afraid to ask. Compute one now! Algorithms Implementations By Hand Distance Estimates Mathematics Acknowledgements 1. Compute a square root now! Enter a non-negative number in the Input field below:

 Posted by at 7:16 am
May 072019
 
Microcode: Electronic Building Blocks

http://www.vcalc.net/hp-code.htm   Microcode: Electronic Building Blocks For Calculators Last Update: January 22, 2003 — THE HP REFERENCE Hewlett Packard Personal Calculator Digest Vol. 3, 1977 pp 4-6 Just as DNA can be called the building blocks of the human organism. Microcode can be called the building blocks of the electronic calculator. But, while the way the […]

 Posted by at 7:53 pm
May 042019
 
Mechanical calculator divisions

Division, part 1: Integer division   MATHEMATICAL CRANKS ABOUT USAGE RESTORATION AND INVESTIGATION HISTORY Adventures in mechanical calculation DIVISION, PART 1: INTEGER DIVISION May 11, 2014 · by Jake · in Usage · 1 Comment Been a long time since I said anything here, and I and my Nippon HL-21 are parted for a few weeks, so I’ll talk algorithms for a while. Thus […]

 Posted by at 7:22 pm
May 032019
 
Cardiac in Python

http://www.pythondiary.com/blog/Oct.15,2014/building-cpu-simulator-python.html   Python Diary Blog Reviews Project Templates Bookmarks My Projects RSS About Wednesday, October 15th, 2014 Building a CPU simulator in Python You can find the entire source listing from this article, plus more interesting code on my Python Experiments BitBucket page. Plus, the source code there will evolve and grow. Early this morning in my Planet Python feed, […]

 Posted by at 5:44 am
May 032019
 
CARDIAC stands for "CARDboard Illustrative Aid to Computation."

https://www.cs.drexel.edu/~bls96/museum/cardiac.html   Background The acronym CARDIAC stands for “CARDboard Illustrative Aid to Computation.” It was developed by David Hagelbarger at Bell Labs as a tool for teaching how computers work in a time when access to real computers was extremely limited. The CARDIAC kit consists of a folded cardboard “computer” and an instruction manual. In July […]

 Posted by at 5:43 am
May 032019
 
Accurate ADC readings on the Arduino

https://hackingmajenkoblog.wordpress.com/2016/02/01/making-accurate-adc-readings-on-the-arduino/ HOME SHOP LEARN BLOG NEWS RESOURCES CONTACT LOG IN REGISTER MY CART You are here Home » Blogs » matt’s blog » Making accurate ADC readings on the Arduino Making accurate ADC readings on the Arduino Submitted by matt on Mon, 01/02/2016 – 12:28 There are many sensors out there which output a voltage as a function of the supply voltage […]

 Posted by at 5:41 am
Apr 272019
 
PCB

  EN PRODUKTY POPTÁVKA / OBJEDNÁVKA TECHNICKÉ INFORMACE TECHNOLOGIE NOVÁ BROŽURA KONTAKT Výroba desek plošných spojů Nová brožura pro vývojáře Na 20 stranách formátu A4 najdete celou škálu tabulek, nákresů, fotek nebo popisů důležitých pro kvalitní návrh desek plošných spojů. Přináší důležité informace a odpovědi na vaše dotazy. Navrhnutý stackup, dodržení aspect ratia vrtaného otvoru, […]

 Posted by at 3:13 pm
Apr 222019
 
Floating point format

https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html     Numerical Computation Guide   Appendix D What Every Computer Scientist Should Know About Floating-Point Arithmetic Note – This appendix is an edited reprint of the paper What Every Computer Scientist Should Know About Floating-Point Arithmetic, by David Goldberg, published in the March, 1991 issue of Computing Surveys. Copyright 1991, Association for Computing Machinery, Inc., reprinted […]

 Posted by at 7:29 pm