Category: Reference

RabbitMQ Message Queuing on FreeBSD

RabbitMQ is a message queue system. It lets computer programs send each other work to do, without waiting for them to do it. I’ve been getting this working on the open-source FreeBSD unix-like system. These are notes on getting started. This writeup was helpful to me. Install it and get it working As with any complex server software, there are… Read more →

Battery costs and the smart grid

The GM company recently disclosed, to their vendor’s dismay, that they can buy electric-vehicle batteries for their new Bolt EV for US$145 per kilowatt hour. It’s rare enough to find costs for these batteries that it’s worth doing a scratchpad computation of what the payback might look like for home electric use. My home electricity supplier (National Grid) charges separately for… Read more →

Adrian Frutiger

Mr. Frutiger designed type. Among his designs were OCR-B. It’s used to print the numbers on bank checks. He also designed Univers and the eponymous Frutiger. If you have found your way in many airports worldwide, you owe it partially to the signs with Frutiger’s letterforms. He died September 10, 2015. Read more →

Good stuff from Microsoft

Microsoft has rolled out some good developer-support stuff lately. This will help us get past their embrace – extend – suffocate strategy of the Ballmer years. They now allow individuals and small teams to use Visual Studio Community Edition free of charge. This is huge for their ecosystem: it puts them on a par, toolchain-wise, with the Java / Eclipse ecosystem.… Read more →

Vaccination rates by school in Massachusetts

Here’s an interesting data set.  This table contains vaccination rates for kindergartners by town and school in Massachusetts. It shows immunization rates for DTaP (Diptheria, Tetanus, and Pertussis), Polio, MMR (Measles, Mumps, Rubella), and Hepatitis B. It also lists immunity to chickenpox. It’s published here as an Excel file.  That makes it easier to numbercrunch, slice, and dice. Vaccination Rates… Read more →

Google Chromecast digisign references

These are notes on digital signage on the Google Chromecast. Google’s docs https://cast.google.com/publish/#/overview   Console https://developers.google.com/cast/docs/custom_receiver   Writeup SaaS vendors. https://www.signsimple.com/ (local launch) http://launch.signagely.com/  (not up yet) Chromecast code repos https://github.com/pjjanak/chromecast-hello-world http://labs.cooperhewitt.org/2013/c-is-for-chromecast-hacking-digital-signage/ Limitations The Chromecast device does a good job of displaying media at 1080p resolution.  However, any web pages surrounding that media to provide a user interface are limited… Read more →