Just images and 2 short videos.
Well, this won’t make it any easier! Not at all…
This card is pretty good, when it works. Transfer-speeds were fine, close to 100MB/s with an external USB3 disk. It works nicely with Linux – plug and play.
Then the problems started…
Posted in Electronics.
Tagged ACT4060A, buck, controller, DC-DC, efficiency, PCI-E, regulator, Renesas, TD6810, testing, USB3, µPD720202
In the previous two posts we dealt with the script ‘after.local’, which is a remnant on openSUSE of the ‘init’-days, before systemd became the standard.
After looking more closely, it turns out that there is a ‘unit-file’ for ‘after.local’ backward-compatibility. This makes the following rather simple.
Essentially we’ll just have to copy/rename/paste a few files to create a new service that does what we want ;-)
In my previous post I described a method for a boot-activated remote-admin option for my parents’ computer.
On 2nd thought, it is not always a good idea to rely on changing system-wide configurations (such as sshd_config, firewall…)
In this post I’ll basically re-do the whole thing. This time an extra SSH-server is started, in addition to any existing ones, listening on a custom port + custom config options. The firewall is dealt with in the script as well.
Yes, I know about KDE desktop sharing, FreeNX and relatives… and again yes, this is nothing new, but someone might still find it useful.
I wanted and needed something simple, something that could be activated in the bootloader menu (grub 2), something that didn’t leave the machine wide-open when absolutely not needed, something that would be robust and wasn’t necessarily depending on a working GUI.
1) KERNEL BOOT PARAMETERS
The boot-parameters that were used for the currently running kernel can be found in the file ‘/proc/cmdline’, easy to read and evaluate.
Yes, yet another power-supply failure!
Just to be on the safe side, not being guilty of lack of initiative, I post this on here as well ;-)
I seek permanent employment in Germany, willing to move almost anywhere (*).
By education I’m a physicist, dealt with fs-lasers [as a tool] & vacuum systems for a while (HV mostly, but I’ve had ‘a short play’ with a UHV system as well). I know what building a lab from scratch & running it is like. Been there, done that.
I have a couple of years experience as a linux system admin (apache, samba as NT4 PDC replacement, backup automation, etc. etc.), personally I’ve been using linux since about 1996 or so. I regularly ‘play’ with VirtualBox, contribute to some opensource projects (mostly bug reports), write some C-code for microcontrollers, design, build & test various electronics devices – as can be seen on this very blog.
I like to play with technology & solder tiny SMD parts by hand – I’m a geek (or nerd?).
Want to employ me? Take a look at my profile on “monster”
(*) fast internet access is a must.
List of scientific publications:
“Enhancing the Brilliance of High Harmonic Generation”
Applied Physics A, 2009
Robert Spitzenpfeil, Stefan Eyring, Christian Kern, Christian Ott, Jan Lohbreier, Jan Henneberger, Nico Franke, Sebastian Jung, Dominik Walter, Matthias Weger, Carsten Winterfeldt, Thomas Pfeifer, Christian Spielmann.
“Maximizing the brilliance of high-order harmonics in a gas jet”
New Journal of Physics, 2009
Jan Lohbreier, Stefan Eyring, Robert Spitzenpfeil, Christian Kern, Matthias Weger, Christian Spielmann
“Spatial optimization of filaments”
Applied Physics B, 2007
Dominik Walter, Stefan Eyring, Jan Lohbreier, Robert Spitzenpfeil, Christian Spielmann
“Towards optimal control with shaped soft-x-ray light”
Optics Express, 2007
Thomas Pfeifer, Robert Spitzenpfeil, Dominik Walter, Carsten Winterfeldt, Frank Dimler, Gustav Gerber, Christian Spielmann,
“Adaptive spatial control of high-harmonic generation”
Ultrafast Phenomena XV – Springer Series in Chemical Physics , 2007
Carsten Winterfeldt, Jan Lohbreier, Alexander Paulus, Thomas Pfeifer, Robert Spitzenpfeil, Dominik Walter, Gustav Gerber, Christian Spielmann
“Adaptive temporal and spatial shaping of coherent soft x-rays”
Proceedings of SPIE, 2006
Carsten Winterfeldt, Thomas Pfeifer, Dominik Walter, Ron Kemmer, Alexander Paulus, Robert Spitzenpfeil, Gustav Gerber, Christian Spielmann
“Adaptive spatial control of fiber modes and their excitation for high-harmonic generation”
Optics Express, 2006
Dominik Walter, Thomas Pfeifer, Carsten Winterfeldt, Robert Spitzenpfeil, Ron Kemmer, Gustav Gerber, Christian Spielmann
“Spatial control of high-harmonic generation in hollow fibers”
Optics Letters, 2005
Thomas Pfeifer, Ron Kemmer, Robert Spitzenpfeil, Dominik Walter, Carsten Winterfeldt, Gustav Gerber, Christian Spielmann
This firmware for the ISML + HC-05 Bluetooth module currently implements the same simple interface as the current WiFi-code named ‘browser_control’.
Pairing the ‘HC-05’on linux using the command line (openSUSE 13.2):
When first powered on, the HC-05 module will blink its status LED rapidly, indicating that no link has been established.
Behold, the stickers of DOOM…
If you should find any of these on a shipment to you, prepare for battle!
I ordered a couple of WS2812B on Aliexpress more than THREE months ago. Boy what trouble that has conjured up!
The seller on Aliexpress now probably thinks I’m a crook, because I missed an email that asked me to provide the customs forms to prove my shipment was held by them. Sometimes I get so many emails that I must have missed it. Oh well… I’ll have to get in touch with him (or her) and sort things out.
The final ruling by the HZA: I’ll have to pay 19% import tax, then can pick up my stuff and leave. Yay.
ARGH! I can’t be having with that! I do hope this lamp is a low voltage one…
Purple circuit boards are available on oshpark. $2.30 for a three-pack (free shipping).
Preliminary testing of WiFi control using the ESP8266 module.
Posted in Electronics.
Tagged AVR, erratic behaviour, ESP8266, IKEA, ISML, LED, mood light, RAM, RGB, Smatid, usage, WiFi, WS2812B
Last night I experienced a slight audible annoyance, coming from the #ISML power supply (5V-3A). Shortly thereafter the light literally went out, permanently. I noticed a very faint smell of burnt electronics, but delayed the autopsy until today.
Everything must go! What a good excuse to “Take it apart!” ;-)
To be honest, I’m not looking forward to opening this letter…
…but there is no way around it.