The Man in Seat Sixty-One - the train travel guide...
Very informative third party enthusiast's train travel website, with worldwide scope.

"Train travel is a more rewarding, low-stress alternative to flying, which brings us closer to the countries we visit and reduces our contribution to climate change. It's time to rediscover the pleasure, romance & adventure of travel by train or ship. This site explains how to travel comfortably & affordably by train or ferry where you might think air was now the only option. For help with train travel, ask the Man in Seat 61!"
train  travel  rail  sustainability 
Open Press Project | home
Student project to design an affordable, easily reproduced printing press gets legs. Per the Long Beach Public Library Maker Studio, which has a couple.

"On a mission to make printmaking accessible to everyone."
art  DIY  printmaking  press  openSource  3DPrinting 
6 days ago
Have I Been Pwned: Pwned Passwords
Check passwords (manually, one at a time, and trusting not to exploit them) to see if they're known to have been exposed in data breaches. This doesn't mean the exposure is of YOUR login; just that SOMEONE is known to have used that password.
security  password 
7 days ago
Tom Parker (@omnispook) • Instagram photos and videos
Paintings by dad's high school and architecture school buddy, Tom Parker (and a sailboat).
art  artist  painting  photography 
16 days ago
Paintings by dad's high school and architecture school buddy, Tom Parker.
art  artist  painting 
16 days ago
Search for Accessories
Search for MFi accessories certified by their manufacturers and reported to Apple. In other words, if a seller says an iPhone charging cable is MFi certified and you can't find it here...the seller is lying. Search by brand, model, or UPC. Per Amazon reviewer "DynamicDuo."
shopping  Apple  hardware  MFi  iPhone  iPad 
21 days ago
April Vollmer – mokuhanga woodblock prints
Website of moku hanga printmaker April Vollmer. There's some very clever stuff here.
artist  printmaking  mokuHanga  art 
22 days ago
"We blend the best ingredients to produce traditional yet locally-minded miso paste and products. Produced in the heart of L.A.’s Arts District. We hope to serve the local miso demand first and foremost while offering a taste to global neighbors as well. Small batch sizes, unhurried fermentation times, and attention to detail allows us to offer a masterful miso."

I encountered their "omiso balls" outside Demitasse at the 2019 Little Tokyo Oshogatsu, then foolishly did not sample any of their miso soup, or remember to return and buy some.
LosAngeles  cooking  Japanese  shopping 
22 days ago
USBHOF | Honor, educate, preserve, and promote the history of bicycling in the USA
US Bicycling Hall of Fame--sequestered in Davis, CA, of all places. Who knew. Open six hours a week, so good luck being here at the right time.
bicycling  museum  Davis 
5 weeks ago
International Slide Rule Museum
"ISRM is the world's largest free digital repository of all things concerning slide rules and other math artifacts."
engineering  mathematics  history  technology  slideRules 
6 weeks ago
Möbius und Ruppert - Spitzer, Zeichengeräte, Scheidemaschinen und Kosmetikspitzer
Very nice old school drawing equipment (e.g. pencil sharpeners, including those ubiquitous brass and magnesium blocks with replaceable blades).
drawing  pencil  design 
6 weeks ago
Oldest Varroa tolerant honey bee population provides insight into the origins of the global decline of honey bees
This paper makes a chicken-and-egg argument re: the relationship between deformed wing virus and an important vector, the parasitic Varroa destructor mite.

"The ecto-parasitic mite Varroa destructor has transformed the previously inconsequential Deformed Wing Virus (DWV) into the most important honey bee viral pathogen responsible for the death of millions of colonies worldwide. Naturally, DWV persists as a low level covert infection transmitted between nest-mates. It has long been speculated that Varroa via immunosuppression of the bees, activate a covert infection into an overt one. Here we show that despite Varroa feeding on a population of 20–40 colonies for over 30 years on the remote island of Fernando de Noronha, Brazil no such activation has occurred and DWV loads have remained at borderline levels of detection. This supports the alternative theory that for a new vector borne viral transmission cycle to start, an outbreak of an overt infection must first occur within the host."
beekeeping  biology  VarroaDestructor 
7 weeks ago
varroa mite - Varroa destructor Anderson and Trueman
Thorough article about the parasitic Varroa destructor mite.
beekeeping  VarroaDestructor 
7 weeks ago
A Practical Plan to Become a More Agile Learner
Becoming an "agile learner," if you aren't one already. In that case, maybe becoming a better agile learner?

From the website:

These transformation-ready leaders don’t ask what they need to know about a given circumstance; they ask what they can learn from it. The subtle difference signals a flexible, curiosity-driven mind-set in the latter, and exposes a more rigid, expertise-forward attitude in the former that may limit their relevance beyond their core set of skills.
learning  change  education  work 
11 weeks ago
Kansas Riverkeeper, Friends of the Kaw
If I still lived in Topeka, I'd surely be a member of this organization, dedicated to protecting the Kaw (a.k.a. Kansas) River. As it is, I'm tempted. Not sure whether the acronym (FOK) most strongly compels cringing or admiration. Per Sara Dickinson.

From the website:

Friends of the Kaw (FOK) serves the Kansas River, known locally as the Kaw. The Kaw is the largest prairie watershed in the world. The river originates at the junction of the Smoky Hill and Republican Rivers and runs more than 170 miles to meet the Missouri in northeast Kansas. The Kaw provides drinking water for 800,000 people. Its main uses are industrial: irrigation; water for three coal-fired power plants (including two of the nation’s filthiest); municipal wastewater; industrial discharges; and commercial sand and gravel mining.

For more than twenty years, our water-focused friends group has been the only grassroots conservation group dedicated to protecting the Kaw. Our members come from rural, urban, and suburban areas and represent canoers, kayakers, fisherfolk, hunters, birdwatchers, and locals who love the river.
river  KawRiver  Kansas  Topeka  conservation  kayaking 
11 weeks ago
Today on Non Sequitur - Comics by Wiley Miller - GoComics
One of the better strips in the "LA Times." There was a time when the artist was disgusted with and cynical about ALL politics, which irritated me. Since then, he seems to have been shocked back to the idea that some politicians are worse than others. Sometimes the strip gets esthetically ambitious.
comics  humor  drawing  art 
11 weeks ago
Austin Hardwoods & Hardware
Good selection of woods; per Sam Medeiros.
lumber  wood  woodworking  SantaAna 
11 weeks ago
The Color of Art: Home - Pigments and Paints
Database of pigment properties, with paint and medium properties. From the site:

These are, to my knowledge, the most complete color index pigment code reference of it's type available on the internet for free. The pigment information is sorted by color index name making it easy the look up the pigment codes that are listed on artist paint tubes. The Colour Index Generic Names and Colour Index Constitution Numbers are voluntary international standards of the ASTM (American Society for Testing and Materials), CII (Color Index International), AATCC (American Association of Textile Chemists and Colorists), and the SDC (Society of Dyers and Colourists). The Color Index Codes and generic pigment names were developed so that artists and colorists had a consistent international standard.
This pigment reference database consists of the color index pigment code name, generic pigment name, common paints/pigments names, color index chemical constitution number, chemical composition or formula, transparency/opaqueness, light fastness, oil absorption, toxically/safety, and other artists' paint information.
art  pigment  paint  color 
12 weeks ago
handprint : technique
Watercolor: choosing brushes, paper, and colors and pigments; then technique. The site appears elegant and parsimonious, but also very informative.
art  painting  color  watercolor  reference 
12 weeks ago
William T. Vollmann turns his mammoth talents to climate change - Los Angeles Times
Favorable review of William T. Vollmann's "No Immediate Danger" (volume one of "Carbon Ideologies"), from the "Los Angeles Times."
book  author  WilliamTVollmann  climateChange  science  nonfiction 
12 weeks ago
Artist Ron Leiter showed his striking metal sculptures in the 2018 Long Beach Open Studio Tour.
sculpture  art  artist  LongBeach 
october 2018
Dorte Christjansen Watercolors And Batiks - Online
This watercolor and batik artist participated in the 2018 Long Beach Open Studio Tour. She has an eye for color, patience for detail, and a bold approach to reusing motifs in various media.

"The imagery I select is inspired by my surroundings, whether landscape, garden or my cats. I try to preserve perfect instances in time to be enjoyed at leisure. My favorite media for creating my paintings are watercolor and batik."
artist  painting  fabric  LongBeach  art 
october 2018
H&H Book Services
These bookbinders showed up at the 2018 International Print Museum LA Printers Fair.
book  repair  crafts  presentation 
october 2018
Ivar's Seafood Restaurants & Chowder | Ivar's
A Seattle classic--and quite good, last time I checked. Also and more straightforwardly at

"The Northwest dining legacy that is Ivar’s began in 1938 with one very entrepreneurial spirit, the late Ivar Haglund. His future in music and entertaining took a slight detour when his waterfront aquarium needed a vendor to feed its guests. Using his own classic Northwest seafood recipes, Ivar’s was born. This dining destination has since spawned many more restaurants to delight future generations."
restaurant  seafood  Seattle 
october 2018
Monica Leal
Artist Mónica Leal Cueva offers her myriad talents to other artists.
design  photography  websiteDesign  socialMedia  marketing 
october 2018
Monica Leal Cueva
To be honest, I don't remember where I saw Cueva's striking work and picked up her business card.

"Mónica Leal Cueva is a visual artist based in Los Angeles. Born in Mexico into a passionately artistic family, she was exposed to a wide range of artistic expression from early childhood. Her father, a trio guitarist, introduced her to the deep romanticism of bolero music, and her mother, an accomplished painter, showed her the wonders of the classical masters. Her family’s bohemian poetry-reading evenings further stroked her fascination with the fundamental unity of the creative process through word, sound or color, and her constant traveling through Mexico imbued her with the subtle sensibility of its traditional and modern arts, which blend a direct, unflinching look at what it is to be human with a subtle, even tender surrealism and love of fantasy."
art  artist  photographer  photography  LosAngeles 
october 2018
Pie In The Sky Press
Proprietress Rebecca Chamlee showed some of her beautiful work at the 2018 International Print Museum LA Printers Fair.

"...finely crafted limited-edition hand-bound letterpress printed books, broadsides and ephemera."
printing  book  SouthernCalifornia  art 
october 2018
Amy Hay California Artist Portfolio
Hay exhibited in the 2018 Long Beach Open Studio Tour.
art  artist  painting  drawing  printmaking  LongBeach 
october 2018
Katie Elizabeth Stubblefield
Painter exhibiting in the 2018 Long Beach Open Studio Tour.
artist  painting  LongBeach  art 
october 2018
Sake Dojo
Trendy small plate and sushi restaurant with about a million beers.
restaurant  contemporary  Japanese  LittleTokyo  LosAngeles 
october 2018
Arduino the Object Way
Paul Murray's extended meditation on OOP in Arduino C++.
programming  coding  OOP  Arduino  C++ 
october 2018
The Hive Tribe | Beekeeping at your place.
Urban bespoke beekeeper Ruth Askren's site; per Dick Barnes.

"The Hive Tribe Beekeeping Service establishes and maintains honeybee hives for estates, orchards, small ranches, and backyards in Los Angeles."
beekeeping  urbanBeekeeping  SouthernCalifornia 
october 2018
Arduino - APIStyleGuide
The Arduino style guide for code libraries is deliberately contrarian. This is the closest thing to an explanation of Arduino C++ object-oriented programming in the canonical Arduino reference. It's a once over lightly, with little discussion of OOP and no mention of how to use the Arduino IDE to create .h and .cpp files, and how to manage them.

"This is a style guide to writing library APIs in an Arduino style. Some of these run counter to professional programming practice. We’re aware of that, but it’s what’s made it possible for so many beginners to get started with Arduino easily."
Arduino  style  programming  C++  reference  OOP 
october 2018
Heifer International | Charity Ending Hunger And Poverty
Organization devoted to ending hunger and poverty. Per Barbara Sinclair, who was impressed by the program which buys a family a beehive.
charity  NGO  food  money  nonprofit  beekeeping  farming 
october 2018
Fresh Juice, Fruit Smoothies, Energy Bowls & More | Jamba Juice
A lot of sugar and water with a thin veneer of nutrition. What's not to like? I've enjoyed an occasional indulgence. If you want to know how much protein you really got, this website will help.
eating  food  dessert  smoothie 
october 2018
Now Serving
Janis writes "This place was written up in 'Bon Appetit' — a cookbook store mostly but they have other things and limited food — and might be worth visiting."
shopping  LosAngeles  Chinatown  bookstore  kitchenSupplies  groceries  cooking 
october 2018 - Online Shopping for Popular Electronics, Fashion, Home & Garden, Toys & Sports, Automobiles and More.
Large distributor has entered the Arduino / Raspberry Pi market; per "Make: Sensors." The author cautions that this supplier is slow, parts are of mixed quality, prices are low, and selection is broad.
I've added a lot of verbatim background description to other suppliers identified by this book, taken from their "About Us" pages. If has such a page, it red-shifts away, pushed forever out of reach by an unstoppable torrent of retail product thumbnails. Clicking through to individual products leads to eBay-style listings with sketchy information. For example, a particular fan isn't actually $2400; close inspection shows that to be for a lot of 100 or so. No dimensions are offered for many biscuit fans. And so on.
In sum, not too appealing.
electronics  part  shopping  DIY  Arduino  physicalComputing 
october 2018
DealeXtreme - Cool Gadgets at the Right Price - DX Free Shipping Worldwide
Large distributor has entered the Arduino / Raspberry Pi market; per "Make: Sensors." When searching for it, I can't help noticing a variety of videos questioning its legitimacy. From the website: was founded in 2005 as a specialty gadget shop specializing in flashlights, flash carts, and lasers. Since then has exploded in growth, making every endeavor to find Extreme gadgets in the world and currently offers over 110,000 items from the world’s smallest microSD readers, big RC helicopters, to genuine Nokia phones. While our gadget collection has grown, our passion for gadgets has not.
electronics  part  shopping  DIY  Arduino  physicalComputing 
october 2018
Allied Electronics & Automation - Industrial Automation & Control Products Distributor
Large distributor has entered the Arduino / Raspberry Pi market; per a somewhat misleading pointer in "Make: Sensors," which cited "RS Electronics." See, RS Components is a brand of Electrocomponents PLC, and Allied Electronics & Automation is what you get when you click through the RS Components "USA" link, so....
From the website:

Allied Electronics & Automation is a high service level, authorized distributor of industrial automation, interconnect, cabling, and electromechanical products. We are part of the $1.7 billion global distributor, Electrocomponents, serving as Allied Electronics & Automation in the Americas and RS Components around the rest of the world.
Our global footprint and world-class logistics allow us to give customers the products they need, when they need them.
We carry more automation and control brand names than any other distributor in North America. With more than 3.5 million parts available at, customers look to Allied for a broad range of products from more than 300 brand-name suppliers.
electronics  part  shopping  DIY  Arduino  physicalComputing 
october 2018
Newark element14 Electronics | Electronic Components Distributor
Large distributor has entered the Arduino / Raspberry Pi market; per "Make: Sensors."
From the website:

Newark element14 is a high-service distributor of technology products, services and solutions for electronic system design, maintenance and repair. Bringing together the latest products, services, and development software, all connected to an innovative online engineering community where purchasers and engineers can access peers and experts, a wide range of independent technical information and helpful tools.

Whether researching a new technology, designing an electronic product, or looking for parts to repair an existing system, we are the trusted global source to find the answers and parts you need to keep your project on the fast track, right from the start.
electronics  part  shopping  DIY  Arduino  physicalComputing 
october 2018
element14 Community | Design Engineer Community | Online Electronic Resources & Support
Collaborative online community for electronics professionals and enthusiasts. From the website:

Established in 2009, the element14 Community is the industry standard for electronics collaboration. It has popular technical blogs, videos and webinars that provide information on the latest in electronics trends such as the Internet of Things and Wireless Technologies. It also hosts the very popular Ben Heck Show. It is a place where you can:
CONNECT with a community of thousands of engineers and innovators from all over the world.
LEARN about the very latest in new technology from industry experts, suppliers, independent sources and user reviews.
CREATE and source your next electronics project with access to 24/7 community support to tackle tough project challenges.
INSPIRE and be Inspired; build your next project and help others to create a better connected world.
electronics  DIY  IOT  engineering  community 
october 2018
AeroPress - Official Store, Replacement Parts and AeroPress Recipes
"The AeroPress coffee maker was created by Alan Adler, a Stanford University lecturer and inventor of the Aerobie flying ring. Alan holds over 40 patents."

With coffee grounds and hot water, this wonderfully elegant, simple device makes a concentrate that is not quite as strong as good espresso, with no crema to speak of. If you like espresso, you could stop there. I usually add hot water to dilute to drip coffee strength. Lately I typically use light roasts, with water between 160 and 170 degrees Fahrenheit (checked with a laser thermometer if necessary). I unscrew the filter cap, peel the paper filter off and rinse it for reuse (they'll last for about a month before rupturing--no need to push it that far), and pop the puck right into the compost. Then I reassemble the device with the filter inside, so it dries flat. I've been using this for a long time.
The manufacturer's website has parts Amazon and others don't carry, although shipping and sales tax can add up.
coffee  cooking  kitchen  hardware  Aeropress  parts  repair 
october 2018
Dean's Beans Organic Coffee - Dean's Beans
Current source of most of the green coffee beans roasted here at the Finca Fabulosa. This socially conscious firm also carries fair trade cocoa, chocolate, and sugar.
shopping  coffee  DIY  chocolate 
october 2018
Wood Carving Tools - Wood Carving Supplies - Wood Carving Equipment -
What it sounds like. Lots of carving bits for power tools. Per California Aiseki Kai member Al Nelson's photo-essay, "Making a Painted Daiza" ($27s+Daiza+Show_Part2.pdf).
From the website:

Wood Carvers Supply Inc is the original US Company solely dedicated to meeting the needs of wood carvers for tools and supplies worldwide. Wood Carvers Supply Inc was founded in 1955 by a European master wood carver. Today we continue to lead our industry with top quality, innovative products, service and value. Many of our products are developed by and available only from us; all are guaranteed for satisfaction and lowest price. Our shipping charges are fair and simple. Just $8.50 covers the cost of delivery within the 48 contiguous states regardless of weight or value!
wood  woodworking  printmaking  mokuHanga  tool 
october 2018
Home - Suiseki,, viewing stones
Local club of "viewing stone" hobbyists, emphasizing suiseki: "small stones that may resemble a much larger landscape or natural form or pattern." (There are other types of viewing stones.) They put on an annual show at the Huntington Gallery, between Christmas and New Year's Eve. Per 2018 Long Beach Open Studio Tour participant.
stone  Japanese  Gardena  art 
october 2018 Industrial Supplies, Tools, MRO Products & More
Interesting door hardware, among about a bazillion other things. Of course, "interesting" doesn't mean "cheap."
shopping  hardware 
october 2018
The Works of Tim Powers
All about author and Philip K. Dick protege Tim Powers; per Mark Weisberg.
author  fantasy  scienceFiction 
october 2018
Metal 3D Printing - 3DEO - Metal Additive Manufacturing
From the website:

3DEO makes high quality metal components with our proprietary metal 3D printers. We specialize in manufacturing low/medium volumes on demand, which means there’s no need to worry about long lead times, minimum order quantities, or high tooling/setup costs.

3DEO helps organizations of all sizes bring product ideas to life with precision engineered metal components. Customers come from virtually every industry – consumer electronics, automotive, medical/dental, aerospace, firearms, oil & gas, power generation, and many others. Every customer that works with us benefits from our breakthrough metal 3D printing technology that has redefined the industry. It’s why today 3DEO is the go-to supplier for 3D printed metal parts.
design  3DPrinting  Gardena  SouthernCalifornia 
october 2018
Manufacturing & 3D Printing Services - Prototype & Production since 1994
Additive manufacturing capabilities include direct metal laser sintering (DMLS).
design  3DPrinting  SouthernCalifornia 
october 2018
3D Printing Service | Custom Manufacturing Solutions | Stratasys Direct | Stratasys
Additive manufacturing capabilities include direct metal laser sintering (DMLS).
design  3DPrinting  SouthernCalifornia 
october 2018
Relativity Space
Privately held startup's long-term goal is to 3D print the first rocket made on Mars. It's a meme collision!
manufacturing  aerospace  space  3DPrinting  startup 
october 2018
Adafruit Industries, Unique & fun DIY electronics and kits
Highly regarded as a source for Arduino and other maker-oriented electronic components. Good tutorials, code samples, forums, and a sense of humor. Dare I say it? A bunch of socially conscious urbanites.
From the website:

Adafruit was founded in 2005 by MIT hacker & engineer, Limor "Ladyada" Fried. Her goal was to create the best place online for learning electronics and making the best designed products for makers of all ages and skill levels. Adafruit has grown to over 100+ employees in the heart of NYC with a 50,000+ sq ft. factory. Adafruit has expanded offerings to include tools, equipment, and electronics that Limor personally selects, tests, and approves before going in to the Adafruit store. Adafruit is a 100% woman owned company.
electronics  part  shopping  Arduino  DIY  tutorial  sensor  hardware 
october 2018
Inline Assembler Cookbook
For real men (and women) only. Harald Kipp's contribution describes how to embed assembly language in C (Arduino/C++) programs. Arduino's AVR page ( cites this.
From the website:

The GNU C compiler for Atmel AVR RISC processors offers, to embed assembly language code into C programs. This cool feature may be used for manually optimizing time critical parts of the software or to use specific processor instruction, which are not available in the C language.

Because of a lack of documentation, especially for the AVR version of the compiler, it may take some time to figure out the implementation details by studying the compiler and assembler source code. There are also a few sample programs available in the net. Hopefully this document will help to increase their number.

It's assumed, that you are familiar with writing AVR assembler programs, because this is not an AVR assembler programming tutorial. It's not a C language tutorial either.

Note that this document does not cover file written completely in assembler language, refer to avr-libc and assembler programs for this.
programming  Arduino  C  C++  assemblyLanguage 
october 2018
Reference > Language > Variables > Variable scope qualifiers > Volatile
Documentation of a C++ keyword which comes up when taking interrupt input, e.g. RPM data from a fan. Note that things get more interesting when the data type length exceeds the processor word length, e.g. when one asks an 8-bit Arduino to read longer input data types: say, a 16-bit int, or a 32-bit long.
From the website:

volatile is a keyword known as a variable qualifier, it is usually used before the datatype of a variable, to modify the way in which the compiler and subsequent program treats the variable.
Declaring a variable volatile is a directive to the compiler. The compiler is software which translates your C/C++ code into the machine code, which are the real instructions for the Atmega chip in the Arduino.
Specifically, it directs the compiler to load the variable from RAM and not from a storage register, which is a temporary memory location where program variables are stored and manipulated. Under certain conditions, the value for a variable stored in registers can be inaccurate.
A variable should be declared volatile whenever its value can be changed by something beyond the control of the code section in which it appears, such as a concurrently executing thread. In the Arduino, the only place that this is likely to occur is in sections of code associated with interrupts, called an interrupt service routine.
programming  C++  Arduino  physicalComputing  sensor  documentation 
october 2018
Fritzing Fritzing
This is why everyone's Arduino diagrams look the same: Because they're drawn with this application, which presumably set the standard; or with other tools which imitate the look, e.g. TinkerCAD. A quote from the website compels me to use Fritzing for the purpose, as a point of honor:

Fritzing is an open-source hardware initiative that makes electronics accessible as a creative material for anyone. We offer a software tool, a community website and services in the spirit of Processing and Arduino, fostering a creative ecosystem that allows users to document their prototypes, share them with others, teach electronics in a classroom, and layout and manufacture professional pcbs.

But then there's this, in the forums:

The unfortunate truth is that Fritzing is dying. It started as a funded research project which is how it got this far. When the grants ran out it went open source but the support hasn’t been there to keep it living and the developers have (presumably) moved on to other funded projects. There is a project to move it to javascript in its early stages but development on the current implementation of Fritzing has pretty much died (the javascript project is seen as the only way forward). I’m poking at bug fixing, but its a large, largely poorly documented project and even getting a development environment running has been difficult.

So crap.
electronics  design  CAD  Arduino  openSource  software 
october 2018
From the website:

Promethease is a literature retrieval system that builds a personal DNA report based on connecting a file of DNA genotypes to the scientific findings cited in SNPedia.
Biomedical researchers, healthcare practitioners and customers of DNA testing services (such as 23andMe,, FamilyTreeDNA, Genos, etc.) use Promethease to retrieve information published about their DNA variations. Most reports cost $10 and are produced in under 10 minutes. Much larger data files (such as imputed full genomes) have increased runtime. Uploading additional data files into the same report costs an additional $4.
genetics  biology  medicine 
october 2018
"SNPedia is a wiki investigating human genetics. We share information about the effects of variations in DNA, citing peer-reviewed scientific publications. It is used by Promethease to create a personal report linking your DNA variations to the information published about them. Please see the SNPedia:FAQ for answers to common questions."
genetics  biology 
october 2018
Slate Star Codex

I haven't figured out how to characterize this blog, but author Scott Alexander is thoughtful and seems rigorous, and it fascinates me. Brought to my attention by the "How to Use 23andMe Irresponsibly" post (
From the "About" page:

Welcome to Slate Star Codex, a blog about science, medicine, philosophy, politics, and futurism.
(there’s also one post about hallucinatory cactus-people, but it’s not representative)
blog  philosophy  psychology  economics  politics 
october 2018
Arduino Fan Speed Controlled by Temperature
Another Arduino-as-thermostat post. This one is noteworthy for use of an LCD display and a filter. From the website:

I made this project because I wanted a way to automatically control the speed of a DC fan according to the temperature read by a LM35 sensor. I had a few problems with the PWM part mainly because the fan made a disturbing noise so I had to add a simple RC filter at the output of the PWM pin on the Arduino board.
electronics  control  Arduino  physicalComputing 
october 2018
How to Make a Temperature-Controlled Fan Using Arduino | Arduino | Maker Pro
Been there, done that; but in a bare bones fashion. This author's use of an LCD display and potentiometer make the post worth review. From the website:

In this article, you are going to learn about Arduino temperature controlled fan using DHT22 sensor and relay. We will use the DHT22 sensor to get the temperature value and we will print this temperature value on the LCD. Then we will check if the temperature value is greater than 35 or not, if the temperature will be greater than 35, then the relay will be activated and the fan will start to rotate.
electronics  control  Arduino  tutorial  physicalComputing 
october 2018
Steinhart–Hart equation - Wikipedia
Wikipedia illustrates finding the three Steinhart-Hart equation coefficients for a thermistor from empirical data. God forbid I should have to do this; but if I must....
sensor  temperature  electronics 
october 2018
Steinhart-Hart Thermistor Calculator
Lots of good stuff about the Steinhart-Hart equation and its use, but assumes coefficients are known, within tolerances. From the website:

Thermistor resistance is  related to temperature in degrees Kelvin by the following formula:

1/T= A + B*ln(R/Rt) + C*ln(R/Rt)2 + D*ln(R/Rt)3

In the standard Steinhart-Hart equation the C parameter is set to zero.  However, some manufacturers use all 4 coefficients.  In the calculator below, you can specify whether to use this term or not, by just setting it to zero.
electronics  sensor  temperature 
october 2018
Interfacing the DS18X20/DS1822 1-Wire® Temperature Sensor in a Microcontroller Environment
OneWire temperature sensor documentation from the source:

Abstract: This application introduces the user to simple 1-Wire software for interfacing a microcontroller to the DS18B20, DS18S20, and DS1822 1-Wire temperature sensors. For example purposes in the article, the DS5000 (8051 compatible) microcontroller is used. Software examples are given that illustrate the implementation of delay, reset, read bit, write bit, read byte, write byte, ROM search, CRC, read temperature, and read scratch pad routines.
electronics  OneWire  sensor  documentation  physicalComputing 
october 2018
1-Wire Communication Through Software
OneWire documentation from the horse's mouth. From the document:

Abstract: A microprocessor can easily generate 1-Wire® timing signals if a true bus master is not present (e.g., DS2480B, the family of DS2482 parts). This application note provides an example, written in 'C', of the basic standard-speed 1-Wire master communication routines. The four basic operations of a 1-Wire bus are Reset, Write 1 bit, Write 0 bit, and Read bit. Byte functions can then be derived from multiple calls to the bit operations. The time values provided produce the most robust 1-Wire master for communication with all 1-Wire devices over various line conditions.
electronics  sensor  OneWire  physicalComputing  documentation 
october 2018
Silicone Molding with FDM Patterns
FDM, or fused deposition molding, is beside the point, as far as I'm concerned. What interests me about this document is the rules of thumb for silicone part design. Most of these apply generally.
From the document:

Silicone molding, also known as room temperature vulcanized (RTV) molding, is a fast and affordable solution for prototyping and short-run production. Offering lead times of three to seven days at just a fraction of the cost of an aluminum tool for injection molding, silicone molding is an attractive alternative for the production of plastic parts.
reference  silicone  manufacturing  design 
october 2018
DS18B20 Arduino User Manual | Henry's Bench
Earlier, I bookmarked a single post by Henry, or Cap'n Fatz, or whoever he is, about using the DS18B20 temperature sensor with an Arduino. Turns out that's one of a series, and here's the table of contents. From the website:

The Maxim (or Dallas) DS18B20 is a pretty versatile device. For example, you can connect multiple devices to a single data line. You can also establish alarm set points [which might simplify some programmatic logic] and thus use the DS18B20 to monitor for over temperature and under temperature conditions.
sensor  electronics  OneWire  Arduino  physicalComputing  temperature  tutorial 
october 2018
DS18B20 Arduino Basics and Tutorial | Henry's Bench
Using the DS18B20 temperature sensor with Arduino. From the website:

The DS18B20 is a solid state temperature sensor that uses the Dallas OneWire technology as it’s means of communicating with the outside world.
It is not quite as simple to use as a TMP36 or an LM35,  but it does have its advantages.   Among them is the fact that you can connect more than one of them in a string and thus save some of that precious Arduino IO.
sensor  electronics  OneWire  Arduino  physicalComputing  temperature  tutorial 
october 2018
TinyPNG – Compress PNG images while preserving transparency
Optimize PNG and JPEG images for online use. You can use the website to compress as many as 500 5 MB images a month; or you can pay for unlimited online access, or a Photoshop plugin. Per the 10/10/2018 "Creative Prose" email newsletter; online at
PNB  JPEG  image  graphics  webApplication  webDevelopment  photography 
october 2018
Bikeable Communities - Bike Friendly Community in Long Beach
Parent organization of Bikestation, involved in many local efforts to make Long Beach a more bike-friendly city. (But not just Long Beach!) The bad news is that the website doesn't seem to have changed since 2016.
bicycling  community  transportation  LongBeach  travel  politics 
october 2018
Bike to work or school and store your bike safely - Bikestation |
Website touting the downtown Long Beach bicycle facility and others like it, along with services to help develop more of the same.
The Long Beach Bikestation seems to be successful, insofar as no memberships are available.
bicycling  community  transportation  LongBeach  travel 
october 2018
Large Scale Rapid Prototyping | Make It BIG
LuBan helps decompose large 3D printing projects into smaller components which can be assembled.
software  CAD  design  3DPrinting 
october 2018
Bolt Depot - Fastener Information - Terminology, Measurement, Materials and more
Who HASN'T been confused by fasteners? (People who've never used or shopped for them?) Bolt Depot is here to help. Tools include printable files, which if printed without scaling, can be used to identify particular fasteners by eye.
reference  tutorial  fastener  screw  design  DIY 
october 2018
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