23 Aug'16

Crash course in 3D printing

Just a few weeks ago I printed a model that I designed myself on a 3D printer for the first time. This post should summarise the key points one has to remember to get into 3D printing.

TODO:

  • required software and hardware (tinkercad, cura, filament & an adjusted printer)
  • types of printers
  • types of filaments
  • thingsverse & tinkercad
  • printing pi zero case
  • cura
  • selecting proper filament settings
  • yay!
  • designing a part in ...

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25 Oct'15

Installing Redis from source on ARM

Ubuntu has quite old packages in the default repositories. It is especially important for web development, where version compatibility may break often.

ownCloud requires a modern version of Redis to use it as a cache and to keep track of the file locks.

PPAs that provide Redis packages do not build for the ARM arch, however. Therefore, with my new Scaleway server, I’ll have to do it by hand ...

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31 May'15

C/C++ based projects on resin.io

I learned about resin.io long time ago (thanks to my friend Shaun Mulligan from resin.io) but didn’t dare to try it out for a long time. Maybe, because most of the examples were in Node.js and targeted Raspberry Pi. At the time, I was doing a project in ad-hoc and wireless sensor networks and implemented it using the Beaglebone Black, Arduino, an LWIR camera (in my ...

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22 Mar'15

Programming Arduino Pro Mini with USBasp V2.0

UPD 2016-05-14: Arduino Nano with CH340 ships from Aliexpress for less than $2 – I recommend you buy it instead (unless you know what you’re doing).

Do you really need to pay $25 for an Arduino? Many of my friends have the original Arduino and they work great, but I wanted to see how cheap I can go. Initially, I purchased the SunFounder Starter Kit and it worked 100% as ...

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11 Mar'15

Review: HBR Guide to Getting the Right Work Done

New guide from HBR doesn’t sell you on a new technique, but instead opens with a chapter titled “You can’t get it all done”. The book presents a reader with two main ideas that seem rather obvious. First idea suggests that to get more time for our tasks, we must stop doing things we’re not supposed to. and that unswerving commitment to daily “rituals” forms the foundation ...

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19 Feb'15

Install cvBlob on Debian

cvBlob installation looked like an easy task but took me a little while to figure out.

First, there are no libcv4 libcvaux4 libraries in Debian (at least in Wheezy). I installed libopencv-dev instead.

Next, there was a very strange problem that persisted after cvBlob installation:

$ ./red_object_tracking
./red_object_tracking: error while loading shared libraries: libcvblob.so:
    cannot open shared object file: No such file or directory

The solution was to run sudo ...

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Update Git on Debian 7 to Git 2.3

Add the following repository to the sources.list:

deb http://ppa.launchpad.net/git-core/ppa/ubuntu precise main
deb-src http://ppa.launchpad.net/git-core/ppa/ubuntu precise main

Now, run sudo apt-get update and get the following output:

W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A1715D88E1DF1F24

And fix it by running

sudo apt-key ...

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16 Feb'15

Clang fatal error: standard headers not found

In the morning I decided to try building the json11 library. I almost submitted a github issue but then understood that the error quite silly and was probably originating from my broken setup:

$ make test
clang++ -O -std=c++11 -stdlib=libc++ json11.cpp test.cpp -o test -fno-rtti -fno-exceptions
In file included from json11.cpp:22:
./json11.hpp:53:10: fatal error: 'string' file not found
#include <string>
         ^
1 ...

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15 Feb'15

Deploying sample Silex app to Heroku

For the last couple of weeks I met quite a few people who were praising PHP and I had an idea to have a brief look at it once again after more than 4-year break.

I decided to push a sample application to Heroku by following their tutorial but that turned out to be nontrivial on my Ubuntu 14.04LTS. Below I’ll give a brief list of commands that ...

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16 Aug'14

Using EOSInfo utility to get your Canon EOS information

Link:

http://astrojargon.net/eosinfo.aspx

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