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Bertrik Sikken
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Bertrik Sikken

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Playing the game 'solar quest' on a Vectrex game console that someone brought to the hackerspace. This is a game machine from around 1983 with a built-in CRT. The display is not drawn in the traditional way by painting pixels, but by drawing vector graphics, basically like a scope in 'X-Y' mode. Color is provided by placing a transparent coloured plastic sheet in front of the screen.
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Bertrik Sikken

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Real-time music waveform on flok's LED panels.
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Nice
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Bertrik Sikken

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Looking into these wireless modules:
http://www.hoperf.com/rf/lora/RFM92W.htm

They use LoRa ("long range") modulation, which is apparently a kind of direct spread spectrum modulation. Combined with a (relatively) high output power of 100 mW they allow a much larger range than similar modules that were available before.
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I ordered a couple of RFM95 modules, and they just work! I'm using this github fork https://github.com/PaulStoffregen/RadioHead of the RadioHead library

High altitude balloons are now also starting to be equipped with the modules for telemetry.
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Bertrik Sikken

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Bwoooo?
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Bertrik Sikken

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Subversion is digging its own grave by insisting on not being able to interoperate with local checkouts created with slightly older/newer clients (minor version change).

I'm creating new projects with git and use subversion only for legacy projects.
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It helps you make the right choice! :-) 
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Very interesting talk about an optimized FM demodulator for use in gnuradio, approximately 10 to 20 times faster.
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That nice approximation is only useful before decimation. After decimation the error is too high.
Well, one can't have everything for free :(
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Bertrik Sikken

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Checkstyle for Eclipse can be such a headache to configure ... makes me want to chop down the stupid TreeWalker thing.
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Rather disappointed in trying to get ubuntu to run on a #RIoTBoard

The flash tools and image files provided by element14are a mess of old and new versions in a giant zip file. The ubuntu image is quite old (october 2013) and apt-get update no longer even works.
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Another complaint: kernel modules do not even match the kernel image!
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Bertrik Sikken

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Easiest way of finding probable threading problems in Java code: look for the 'synchronized' keyword.
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:-)
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Bertrik Sikken

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http://openwebrx.org/ is a pretty cool radio project.

It connects to your rtl-sdr software-defined-radio stick and allows other people to remotely tune to a piece of radio spectrum using a web browser (chrome/chromium or mozilla firefox). It can decode AM, FM, USB, CW.

I just got this piece of software to compile and run yesterday and I expect many more improvements in the near future.
OpenWebRX is a web-based, remote SDR receiver software with the following features: libcsdr based demodulators (AM/FM/SSB),; filters with changeable bandwidth, BFO and PBS,; waterfall display that can be shifted back in time,; uses HTML5 features like WebSocket, Web Audio API.
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Bertrik Sikken

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My crappy chinese "VK16U6" GPS module. It came shipped without any ESD protection, loose in the bubbly envelope. After unwrapping, the metal shield came loose and it turned out that the black rectangular component (I think an oscillator/crystal) wasn't properly soldered to the board. After resoldering the component and the shield, I had not much hope, yet it actually worked and got a fix :)
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In their circles
169 people
Have them in circles
117 people
Folkert van Heusden's profile photo
Li Mao's profile photo
Michael Giacomelli's profile photo
Robert Menes's profile photo
Cesar Schiraldi's profile photo
ngoc nguyen's profile photo
Tjerk Langelaar (Techno)'s profile photo
marie odonnell's profile photo
Alexander Spyridakis's profile photo
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  • Technolution
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Open source, bats, electronics
Introduction
bats, electronics, open source software, rockbox (alternative firmware for mp3 players).