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osmo-fl2k - Using USB-VGA dongles as SDR transmitter
Yesterday, during OsmoDevCon 2018, Steve Markgraf released osmo-fl2k, a new Osmocom member project which enables the use of FL2000 USB-VGA adapters as ultra-low-cost SDR transmitters.
How does it work?A major part of any VGA card has always been a rather fast DAC which generates the 8-bit analog values for (each) red, green and blue at the pixel clock. Given that fast DACs were very rare/expensive (and still are to some extent), the idea of (ab)using the VGA DAC to transmit radio has been followed by many earlier, mostly proof-of-concept projects, such as Tempest for Eliza in 2001.
However, with osmo-fl2k, for the first time it was possible to completely disable...
Meta: Blog comment systems
Comment systems on self-run sites: methods, security, what I've found so far.
Announcing Official Lo-tech Outlet: TexElec
Lo-tech is pleased to announce TexElec as Official Lo-tech Distributor
Мои маленькие реле: Brainfuck компьютер — это реальность
Прошел ровно год с момента прошлой публикации и я подумал что первое апреля — отличный день для ежегодного дайджеста по моим трем безумным компьютерным проектам. В тот раз проект существовал только на бумаге, теперь же — определенно стал реальностью.
Подкатом звенящие релейные блоки, самые быстрые в мире вычисления на реле(но это не точно), монтаж накруткой, вакуумные индикаторы и моргающие светодиодики.
udtrace - Unix domain socket tracing
When developing applications that exchange data over sockets, every so often you'd like to analyze exactly what kind of data is exchanged over the socket.
For TCP/UDP/SCTP/DCCP or other IP-based sockets, this is rather easy by means of libpcap and tools like tcpdump, tshark or wireshark. However, for unix domain socket, unfortunately no such general capture/tracing infrastructure exists in the Linux kernel.
Interestingly, even after searching for quite a bit I couldn't find any existing tools for this. This is surprising, as unix domain sockets are used by a variety of programs, from sql servers to bind8 ndc all the way to the systemctl tool to manage systemd.
In...
ESP8266 powered by a solar panel and a 18650 battery
https://api.thingspeak.com/plugins/7126
On my setup described in here I've added this solar panel from Banggood. If in the past the maximum of battery operated was around 48 days on one charge, now with the help from solar panel I am expecting to run 24/7 without the need to recharge the battery myself.
The panel has dimensions 165x135x2mm and is made from monocrystalline silicon and is rated to 6W and 580 mA.
Exposing it to full sun will produce 6.54 volts and after the diode (I've used a 1N4007) will have 6.00 V.
To connect the solar panel to charger board I've cut a USB to...
IoT with ESP8266
Пневмоника и влажные мечты стимпанка
“Пневмоавтоматика с каждым годом приобретает все большее значение для современной техники. Пневматические приборы широко применяются при автоматизации производственных процессов и при управлении энергетическими установками”
Л.А.Залманзон Пневмоника. Струйная пневмоавтоматика. изд. Наука, М. 1965
Рисунок 1: Fluidic Kit by Tekniska musee
Допустим мы решили забить на сборку компьютера на герконовых реле и заняться еще более безумными вещами. Для тех, кто следит за сборкой BrainfuckPC — не пугайтесь, ему ничего не угрожает. Я лишь строю планы на будущее.
Введение
Знаете ли вы что такое эффект прилипания струи к стенке? Пройдемся ка с вами в ванную, предварительно захватив с собой столовую ложку:
Рисунок 2: Эффект прилипания струи
Мы видим, как...
Report from the Geniatech vs. McHardy GPL violation court hearing
Today, I took some time off to attend the court hearing in the appeal hearing related to a GPL infringement dispute between former netfilter colleague Partrick McHardy and Geniatech Europe
I am not in any way legally involved in the lawsuit on either the plaintiff or the defendant side. However, as a fellow (former) Linux kernel developer myself, and a long-term Free Software community member who strongly believes in the copyleft model, I of course am very interested in this case.
History of the CaseThis case is about GPL infringements in consumer electronics devices based on a GNU/Linux operating system, including the Linux kernel and at least some devices...
We Fixed the Glitch
Around the first of the year our contract manufacturer contacted us about an urgent problem with HackRF One production. They'd had to stop production because units coming off the line were failing at a high rate. This was quite a surprise because HackRF One is a mature product that has been manufactured regularly for a few years. I continued to find surprises as I went through the process of troubleshooting the problem, and I thought it made a fascinating tale that would be worth sharing.
The reported failure was an inability to write firmware to the flash memory on the board. Our attention quickly...
«Сезам откройся» Или Intel RealSense и ResNet на страже фруктов
Не секрет, что в современном высокотехнологичном мире от нас требуется постоянно подтверждать свою личность и права доступа — паролями, бесконтактными метками, отпечатками пальцев и так далее. Можно это делать и с помощью визуального отпечатка — лица пользователя. Достаточно посмотреть на наш гаджет, как он понимает — что перед ним авторизованный пользователь, и снимает блокировку экрана.
Мы решили реализовать подобную схему с помощью подручных материалов и open source решений. В качестве физического объекта, который будет обладать соответствующей "избирательностью к открытиям", был выбран сейф.
Все подробности под катом.
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