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Posted by jpluimers on 2019/08/13
Related: Introducing The “Lab in a Box” Concept (ELC-E-2017-Prague).pdf
Via:
–jeroen
Posted in Development, Hardware, Hardware Development, Hardware Interfacing, Power User, Raspberry Pi, Software Development | Leave a Comment »
Posted by jpluimers on 2019/07/12
Interesting project: [WayBack] WtRPM: A Web-based (Wt) suite to power up/down your computers – mupuf.org
It hooks a RaspberryPi to your ATX power supply.
Via: [WayBack] gpio – Use Raspberry Pi to control PC’s power switch – Raspberry Pi Stack Exchange
–jeroen
Posted in Development, Hardware Development, Hardware Interfacing, Raspberry Pi | Leave a Comment »
Posted by jpluimers on 2019/06/13
Reminder to self to check out these schematics and find out how I got them in the first place.
Related: UPS Pico in Raspberry Pi as CD changer in pre 09/2002 E46 BMW 320i touring, “switchless nicd nimh battery charger circuit diagram”
–jeroen
Posted in Development, Hardware Development, Raspberry Pi | Leave a Comment »
Posted by jpluimers on 2019/05/08
For my reading list:
It might be that Mender 1.7 and up support OpenSuSE:
via:
DTB = Device Tree Blob
–jeroen
Posted in Development, Hardware Development, Raspberry Pi, Software Development | Leave a Comment »
Posted by jpluimers on 2019/02/20
Smart idea by [WayBack] tinspin/rupy: Async. HTTP & NoSQL Distr. VHost PaaS at [WayBack] 687474703a2f2f686f73742e727570792e73652f636c75737465722e6a7067 (480×640):
Apart from one part I found on Amazon, most parts (and more if you want to built it for instance inside a case) can be obtained from [WayBack] DC : Adafruit Industries, Unique & fun DIY electronics and kits, see the pictures and links below.
I think [WayBack] power supply options for multiple PIs – Raspberry Pi Forums got inspired by this or vice versa.
[WayBack] Amazon.com: kenable DC Power Splitter 5 way Adapter 2.1mm CCTV 12V PSU to 5 Camera Cable: Electronics
[WayBack] Female DC Power adapter – 2.1mm jack to screw terminal block ID: 368 – $2.00 : Adafruit Industries, Unique & fun DIY electronics and kits
[WayBack] 2-Way 2.1mm DC Barrel Jack Splitter Squid ID: 1351 – $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
[WayBack] MicroUSB Plug to 5.5/2.1mm DC Barrel Jack Adapter ID: 2727 – $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
[WayBack] Waterproof DC Power Cable Set – 5.5/2.1mm ID: 743 – $2.50 : Adafruit Industries, Unique & fun DIY electronics and kits
[WayBack] Male DC Power adapter – 2.1mm plug to screw terminal block ID: 369 – $2.00 : Adafruit Industries, Unique & fun DIY electronics and kits
[WayBack] Panel Mount 2.1mm DC barrel jack ID: 610 – $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
[WayBack] MicroUSB to 5.5/2.1mm DC Barrel Jack Adapter ID: 2789 – $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
[WayBack] 4-Way 2.1mm DC Barrel Jack Splitter ID: 1352 – $4.95 : Adafruit Industries, Unique & fun DIY electronics and kitsPosted in Development, Hardware Development, Raspberry Pi | Leave a Comment »
Posted by jpluimers on 2019/02/12
I did some more research because of Having one Raspberry Pi reset another Raspberry Pi through relay or transistor.
Details of the above can be found from the below links and images from those links.
There is also an Android App with a RaspberryPi distribution that allows you to operate relays:
Finally there are USB relays, shown way down in this post.
Often these are part of some home automation (domotica), IoT, or other, so these are relevant too:
[WayBack] Exploring Amazon Dash Button | Hackaday.io:This project aims to document the technical details of Amazon Dash Button for those who want to tap into the potential of this inexpensive yet powerful IoT device.Please do feel free to contribute or ask questions if you have something to share.
With the app EWeLink, you can remotely control all of the devices and appliances on your smart phone or tablet.
Posted in Development, Hardware Development, Raspberry Pi | Leave a Comment »
Posted by jpluimers on 2019/01/17
Cool stuff if you want to make your own WOL devices out of spare parts.
From old to new:
They can be woken up by anything sending magic WOL packets, including Raspberry Pi (which cannot be woken up by them, though you could use a Whack-on-LAN for that).
Basically the Raspberry Pi cannot be woken up with WOL because of a few reasons:
It can be a WOL server though: [WayBack] Raspberry Pi As Wake on LAN Server: 5 Steps (with Pictures)
–jeroen
Posted in Development, Ethernet, Hardware Development, Network-and-equipment, Power User, Raspberry Pi, Wake-on-LAN (WoL) | Leave a Comment »
Posted by jpluimers on 2019/01/10
Using OpenSuSE Tumbleweed E20 on Raspberry Pi 3: accessing the enlightenment desktop over VNC after automatic logon I wanted to buy an on-line read-only diary to help my mentally retarded brother see what his next few days are going to be like.
He increasingly has difficulty handling a paper agenda and has an agenda with 30 minute blocks like [Archive.is] bol.com | Bureau Agenda 2017 – 1 dag per Pagina | 0041560163422 | Boeken (and the [Archive.is] picture on the right), but actually he needs 15 minute blocks during some portions of the day.
We call that kind “bureau agenda” which I think translates well into “desk diary”.
They were quite different from the agendas I used to have at school (:
[WayBack] [Zonder titel] Rijam agenda 1983/84 verzamelen? Stripcatalogus op Catawiki
For most school mates, they were more like this:
Had je een O’Neill of ging je voor De Familie Doorzon? De oude agenda’s uit je middelbare schooltijd zijn de verpersoonlijking van je eigen puber-ik. Afgelopen weekend startte in het Nationaal Onderwijsmuseum in Dordrecht de toffe tentoonstelling Grow Up over die vuistdikke, volgeplakte agenda’s.
Anyway, some ideas I initially had are below.
This is what I actually did:
iframe as per [Archive.is] Boyden, Mark – Embedding Google Calendars – Programming – Content andiframe heights as when you specify 100% it will shrink to the height of the content. For full screen height, the 100vh (ViewportHeight) seems to do the trick as per [WayBack] javascript – Full-screen iframe with a height of 100% – Stack Overflow and [WayBack] CSS Values and Units Module Level 3: Viewport-percentage lengths: the vw, vh, vmin, vmax unitsTwo things for the future:
Raspberry based:
mode, wkst, etc).Chromecast based:
–jeroen
Posted in Development, Google, GoogleCalendar, Hardware Development, JavaScript/ECMAScript, JSFiddle, LifeHacker, Power User, Raspberry Pi, Scripting, Software Development | 2 Comments »
Posted by jpluimers on 2019/01/08
I run most of my Raspberry Pi systems headless, so I was a bit surprised that OpenSuSE tumbleweed on a Raspberry Pi 3B didn’t show anything on my HDMI monitor after I installed KDE after it switches away from text-mode boot output.
[WayBack] HCL:Raspberry Pi3 – openSUSE suggests to
I see HDMI output in U-Boot, but not in Linux
The upstream Linux graphics driver for the Raspberry Pi has problems with a few monitors. The same applies to the 7″ LCD displays. In those cases, please fall back to the efi frame buffer console by passing the following into the kernel command line:
modprobe.blacklist=vc4
However, it does not explain how to modify that “the kernel command line”.
Searching for obvious ways via “Raspberry Tumbleweed Kernel Command Line” got me to for instance
which all suggest editing /boot/cmdline.txt, however that file does not exist:
# ls -al /boot total 34624 drwxr-xr-x 6 root root 4096 Jul 23 21:05 . drwxr-xr-x 24 root root 4096 Jul 16 02:02 .. -rw-r--r-- 1 root root 65 Jul 16 12:42 .Image-4.4.76-7-default.hmac -rw-r--r-- 1 root root 0 Jul 16 16:56 0x75b762d5 lrwxrwxrwx 1 root root 22 Jul 16 16:34 Image -> Image-4.4.76-7-default -rw-r--r-- 1 root root 14878208 Jul 16 12:20 Image-4.4.76-7-default -rw-r--r-- 1 root root 3217519 Jul 16 12:20 System.map-4.4.76-7-default lrwxrwxrwx 1 root root 1 Jul 16 02:00 boot -> . -rw-r--r-- 1 root root 1725 May 24 20:11 boot.readme -rw-r--r-- 1 root root 2405 Jul 16 16:56 boot.scr -rw-r--r-- 1 root root 2333 Jul 16 16:56 boot.script -rw-r--r-- 1 root root 152522 Jul 16 08:39 config-4.4.76-7-default lrwxrwxrwx 1 root root 12 Jul 23 16:13 dtb -> dtb-4.11.6-1 drwxr-xr-x 3 root root 4096 Jul 23 16:13 dtb-4.11.6-1 drwxr-xr-x 5 root root 16384 Jan 1 1970 efi drwxr-xr-x 7 root root 4096 Jul 24 18:27 grub2 lrwxrwxrwx 1 root root 23 Jul 16 16:34 initrd -> initrd-4.4.76-7-default -rw------- 1 root root 8080932 Jul 23 21:05 initrd-4.4.76-7-default -rw-r--r-- 1 root root 288571 Jul 16 12:42 symvers-4.4.76-7-default.gz -rw-r--r-- 1 root root 377 Jul 16 12:42 sysctl.conf-4.4.76-7-default -rw-r--r-- 1 root root 1484762 Jul 16 16:56 unicode.pf2 drwxr-xr-x 2 root root 4096 Jul 24 09:05 vc -rw-r--r-- 1 root root 7282031 Jul 15 07:00 vmlinux-4.4.76-7-default.gz
There are other config.txt files:
# find / | grep config.txt
/boot/efi/config.txt
/boot/vc/config.txt
However, these seems to be unclear which of the two is actually used and what options can be set at all: [WayBack] Raspberry Pi • View topic – aarch64 on Pi3.
So the quest continues, as a lot of settings can be applied in these files:
I’ve temporarily given up on the /boot/config.txt editing, but continued searching for “modprobe.blacklist=vc4”, which lead to a few interesting results:
All of those suggest adding modprobe.blacklist=vc4 to the grub configuration. The second post actually has the most elaborate steps for this, which I’ve paraphrased into:
root, edit /etc/default/grub (make a backup first)GRUB_CMDLINE_LINUXmodprobe.blacklist=vc4to the end of the variable initialisation (ensure there is a space before it and you keep the terminating double-quote)grub2-mkconfig > /boot/grub2/grub.cfgThis solved my problem: no text output on HDMI.
Note that in order to get graphical output, you need to install any of the non-JeOS images. Installing just kde+kdm and dependencies isn’t enough to get the X server going.
–jeroen
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Posted by jpluimers on 2019/01/03
Testing SMTP using telnet is tedious as you have to remember the commands and responses in the SMTP protocol. It gets even harder when doing SMTP AUTH, as then you have to base encode a bunch of strings [WayBack] How to Test SMTP AUTH using Telnet [Wiki] | NDCHost
Luckily there is a Perl script swaks: [WayBack] Swaks – Swiss Army Knife for SMTP which does ESMTP and LMTP as well as TLS.
The funny thing is that the repository at jetmore/swaks: Swaks – Swiss Army Knife for SMTP only has the readme, but the not the script which you can get from [WayBack] swaks.pl.
Despite that, most Linux distributions have an installation package.
[WayBack] swaks for OpenSuse is in the [WayBack] network repository, so for Tumbleweed (actually: Factory) on Raspberry Pi you need to perform this:
zypper addrepo http://download.opensuse.org/repositories/network/openSUSE_Factory_ARM/network.repo
zypper refresh
zypper install swaks
On Mac OS X it is even easier: if you have the homebrew package manager installed, you just install the [WayBack] swaks formula using the [WayBack] swaks.rb script:
brew install swaks
Note there is also the smtp-cli Perl script which I mentioned before at Fake/Mock SMTP servers and services for use during development, which also does TLS, but few environments have ready built packages for them. If you still want to try it out:
For SMTP AUTH:
swaks -tls --to jeroen.wiert.me@pluimers.com --from jeroen.wiert.me@pluimers.com --server smtp.xs4all.nl --auth-user username
Which prompts for the password, then outputs like this:
=== Trying smtp.xs4all.nl:25... === Connected to smtp.xs4all.nl. <- 220 smtp-cloud3.xs4all.net ESMTP ESMTP server ready -> EHLO rmbpro1tbjwp <- 250-smtp-cloud3.xs4all.net hello [188.206.68.219], pleased to meet you <- 250-HELP <- 250-AUTH LOGIN PLAIN <- 250-SIZE 157286400 <- 250-8BITMIME <- 250-STARTTLS <- 250 OK -> STARTTLS <- 220 Ready to start TLS === TLS started with cipher TLSv1:DHE-RSA-AES256-SHA:256 === TLS no local certificate set === TLS peer DN="/OU=Domain Control Validated/OU=PositiveSSL Wildcard/CN=*.xs4all.nl" ~> EHLO rmbpro1tbjwp <~ 250-smtp-cloud3.xs4all.net hello [188.206.68.219], pleased to meet you <~ 250-HELP <~ 250-AUTH LOGIN PLAIN <~ 250-SIZE 157286400 <~ 250-8BITMIME <~ 250 OK ~> AUTH LOGIN <~ 334 ############ ~> anA= <~ 334 ############ ~> ############################ <~ 235 ... authentication succeeded ~> MAIL FROM:<jeroen.wiert.me@pluimers.com> <~ 250 <jeroen.wiert.me@pluimers.com> sender ok ~> RCPT TO:<jeroen.wiert.me@pluimers.com> <~ 250 <jeroen.wiert.me@pluimers.com> recipient ok ~> DATA <~ 354 enter mail, end with "." on a line by itself ~> Date: Wed, 19 Jul 2017 09:09:57 +0200 ~> To: jeroen.wiert.me@pluimers.com ~> From: jeroen.wiert.me@pluimers.com ~> Subject: test Wed, 19 Jul 2017 09:09:57 +0200 ~> Message-Id: <20170719090957.052207@rmbpro1tbjwp> ~> X-Mailer: swaks v20170101.0 jetmore.org/john/code/swaks/ ~> ~> This is a test mailing ~> ~> . <~ 250 smtp-cloud3.xs4all.net accepted mail mXA71v00C4jr6ac01XA9Bo for delivery ~> QUIT <~ 221 smtp-cloud3.xs4all.net ESMTP closing connection === Connection closed with remote host.
–jeroen
Posted in *nix, *nix-tools, Communications Development, Development, Hardware Development, Internet protocol suite, Linux, openSuSE, Power User, Raspberry Pi, SMTP, SuSE Linux, Tumbleweed | Leave a Comment »
The Wiert Corner - irregular stream of stuff 