Самодельный текстовый лазерный проектор

В этой статье я рассажу о том, как сделать достаточно простой лазерный проектор из подручных деталей.

www.apertus.org: One week with the AXIOM Team

https://www.youtube-nocookie.com/embed/cdbENj-ml_4

Last week, apertus° community member davidak, from Germany, visited Vienna and participated in a number of AXIOM related activities in the course of one week ranging from hardware assembly, software development and building ergonomic enclosure evaluation prototypes, to shooting with the AXIOM Beta.
Davidak on various AXIOM duties in Vienna.
Shooting the Signs of Autumn in a Vienna Park Of course, nobody wants to work on the AXIOM project without taking the camera for a spin, and so, even though the weather wasn't great (typically autumn), we did. There was only one development prototype at hand but we made the most of it!...

Getting air quality with ESP8266 and Amazon Alexa

https://i.ytimg.com/vi/WvbpKBgGWjM/0.jpg

If last week I've managed to get the temperature and humidity with ESP8266 and Alexa, now it's time to integrate the air quality sensor GP2Y1010AU0F from Sharp.
The GP2Y1010AU0F it is a compact optical dust sensor that has an infrared emitting diode and a phototransistor that are diagonally arranged. It detects in fact the reflected light of the present dust in the air. It is effective to detect very fine particle like cigarette smoke and it can distinguish from the house smoke from the house dust.
GP2Y1010AU0F sensor. It has 6 pins and the electronic inside is split in two parts, the IRED emitting part and...

Getting temperature from ESP8266 over MQTT with Amazon Alexa

https://i.ytimg.com/vi/QQ5jtqvm_HQ/0.jpg

With the help of the Iotcentral.eu platform now I can get room temperature or outside temperature with just an ESP8266 and a temperature sensor like DHT22 or DS18B20 or BMP280.
The Alexa is questioning the iotcentral.eu server that will ask my local broker that will publish a message the the ESP8266 to ask the temperature for my room. The values for temperature and humidity will travel the other way around to Alexa, that is so nice and is letting me know about them.
On Iotcentral.eu you will find also a demoapp ( source code on git) for a plug, but you can...

On the Linux Kernel Enforcement Statement

I'm late with covering this here, but work overload is having its toll on my ability to blog.

On October 16th, key Linux Kernel developers have released and anounced the Linux Kernel Community Enforcement Statemnt.

In its actual text, those key kernel developers cover

compliance with the reciprocal sharing obligations of GPLv2 is critical and mandatory

acknowledgement to the right to enforce

expression of interest to ensure that enforcement actions are conducted in a manner beneficial to the larger community

a method to provide reinstatement of rights after ceasing a license violation (see below)

that legal action is a last resort

that after resolving any non-compliance, the formerly incompliant user is...

SFLC sues SFC over trademark infringement

As the Software Freedom Conservancy (SFC) has publicly disclosed on their website, it appears that Software Freedom Law Center (SFLC) has filed for a trademark infringement lawsuit against SFC.

SFLC has launched SFC in 2006, and SFLC has helped and endorsed SFC in the past.

This lawsuit is hard to believe. What has this community come to, if its various members - who used all to be respected equally - start filing law suits against each other?

It's of course not known what kind of negotiations might have happened out-of-court before an actual lawsuit has been filed. Nevertheless, one would have hoped that people are able to talk to...

www.apertus.org: Google Summer of Code Completed - Result Report: Smart Switching Regulator

Coding Period completed This was our first time participating in Google’s Summer of Code program and it came to an end with our student’s final evaluation period across late August to mid-September 2017. As you may or may not remember we received around 30 applications/proposals (many of which were very good), narrowed this selection down to around 5, and gratefully received 3 slots from Google in the end. After some preliminary work the students got to grips with the camera’s operating processes and all three began the course enthusiastically. Unfortunately, however, one student failed his first evaluation and another failed his...

Obtaining the local IP address of an unbound UDP socket

Sometimes one is finding an interesting problem and is surprised that there is not a multitude of blog post, stackoverflow answers or the like about it.

A (I think) not so uncommon problem when working with datagram sockets is that you may want to know the local IP address that the OS/kernel chooses when sending a packet to a given destination.

In an unbound UDP socket, you basically send and receive packets with any number of peers from a single socket. When sending a packet to destination Y, you simply pass the destination address/port into the sendto() socket function, and the OS/kernel will figure out which of its local...

Invited keynote + TTCN-3 talk at netdevconf 2.2 in Seoul

It was a big surprise that I've recently been invited to give a keynote on netfilter history at netdevconf 2.2.

First of all, I wouldn't have expected netfilter to be that relevant next to all the other [core] networking topics at netdevconf. Secondly, I've not been doing any work on netfilter for about a decade now, so my memory is a bit rusty by now ;)

Speaking of Rusty: Timing wise there is apparently a nice coincidence that I'll be able to meet up with him in Berlin later this month, i.e. hopefully we can spend some time reminiscing about old times and see what kind of...

Ten years Openmoko Neo1973 release anniversary dinner

As I noted earlier this year, 2017 marks the tenth anniversary of shipping the first Openmoko phone, the Neo1973.

On this occasion, a number of the key people managed to gather for an anniversary dinner in Taipei. Thanks for everyone who could make it, it was very good to see them together again. Sadly, by far not everyone could attend. You have been missed!

The award for the most crazy attendee of the meeting goes out to my friend Milosch, who has actually flown from his home in the UK to Taiwan, only to meet up with old friends and attend the anniversary dinner.

You can some pictures in...