Raspberry Pi 4 OwnCloud server
Memo voor de eigen voortgangsrapportage.
De Raspberry Pi 3 doet al weer vijf jaar dienst als meterkastserver, tijd voor wat versnelling en daarom vervangen door een Raspberry Pi 4.
Kastje geprint in PLA. Printje voor de driestanden reset/run schakelaar, ATtiny (pre)processor, aansturing miniventilator en extra (LED) uitgang voor toekomstige uitbreiding.
Audacity toetscombinaties
In goed Nederlands: Audacity keyboard shortcuts dus.
Hoe ging dat ook al weer, een label toevoegen en selectie van cursor tot en met track begin? Als je Audacity een poosje niet meer gebruikt hebt, helpt dit kaartje je weer op weg.
Dubbelzijdig printen, bijsnijden, en dan in driëen vouwen.
Download: Audacity keyboard shortcuts (PDF 230kB)
Protected: Gesproken brief
Fanju Temperature sensor transmission protocol
On AliExpress you find cheap wireless (RF433) weather stations compatible with the ‘Fanju’ weather station model FJ3378/74/79C/65/89 (according to AE). Following is the description of the data transmission protocol.
Continue reading “Fanju Temperature sensor transmission protocol”
Protected: Rondvaart 2019
Random wallpaper from pictures and subfolders
The OS X desktop changer does not follow subfolders in the image source folder. Since SnowLeopard the Screensaver will use the images in subfolders but the Desktop changer will not. As a workaround you can create a folder with links to all images, including images in subfolders (recursively).
In System preferences set the Desktop changer to point to the folder with the links as image source.
Here is a shell script that will create symbolic links (in ~/Desktop/Wallpapers) to all pictures (in ~/Pictures) recursively: wallpaper_links.command
This Python script will show the path to the current image: tkWallpaperCurrent.py
Protected: Gesproken brief
SphereBot Arduino shield
An Arduino (Uno) shield for two stepper-motors, one Servo motor, and an alternative output. For the SphereBot, another Egg-Bot derivative.
This SphereBot is built with a retired Sparkfun Arduino Ethernet Pro board and the steppermotors from a 2009 Makerbot. Firmware and host sw (fork) from thunderbug1.
Download the Eagle schematics and board (ZIP 100kB).
A simple Time Domain Reflectometer
I built the simple signal generator described in Electronic Design. The same circuit you find on ZL1NC and epanorama. Together with an Oscilloscope it can be used to find a cable fault as described in this All about Circuits article.
The 74AC14 SMD is mounted on the board its trace side. All other parts are through-hole. Most parts were salvaged from old electronics. You can adapt the PCB to your needs.