Started to build my Raspberry Pi PiDrive System (for RetroPie)

I’ve started to rework my Raspberry Pi ‘dial-up’ interface. Instead of just handling my external VPN and SSH connections I’ve extended it to also function as an intermediate file server and Git repository (both via NFS+SSH). I’ve also inserted the Raspberry Pi into a new case and added a 1 TB 2,5″ drive. I think it can handle additional load so I plan to extend its capabilities to also serve as a RetroPie console.

By the way: the case and the connector cable between the drive and the Pi are both from WD Labs. The hard drive is not a PiDrive but a refurbished USB 3.0 1 TB disk (it was a recertified My Passport Ultra) before I’ve dismantled it. For me it was cheaper that way. If you’re looking for a similar setup and need an additional power supply and SD card maybe you should think about buying a Nextcloud Box (free shipping; handled by WD). You might not need to use its ‘cloud’ functionality but still get all hardware I’ve previously mentioned which I think is a pretty good bargain.

USB Infrared Toy (Dangerous Prototypes) free PCB build

I finally completed the free USB IR Toy v3 PCB I got over a year ago (May 2015) from Dangerous Prototypes.

It took so long because I had to order some of the parts from Digi-Key – and I wanted to wait until I’ve a longer list of parts to order.
I’ve used a PicKit 3 to program the PIC microcontroller. The trickiest part was finding the setting to power the USB IR Toy with the programmer. (I could have powered both devices via USB, but only had one appropriate cable at my hand at that time.)

usb-ir-toy-programming-verification

So far I’ve only verified that the USB IR Toy is detected as serial device and shows its version number in a terminal window. It looks like the build was successful… 🙂

usb-ir-toy-terminal-v222

Kids + Railway Toilets = Toilet-Blinkenlights…

Today my kids impressed me by repurposing/hacking/misusing the toilet-occupied-light to send (morse-like) signals across a railway car. Their fingers were thin enough to press the micro-switches in the doors which normally would signal a locked door (i.e. occupied toilet). Not sure if someone noticed the strangely flashing lights… 😀

railway-toilet-door

Fake (?) Sunon DP200A/Sunon DP201A fans

Last weekend I had to replace a 230 V fan (120 mm), a Sunon DP200A, that ‘smelled’ strange and also made strange noises. Better safe than sorry…

Well: I ordered a slightly less powerful Sunon DP201A (at Reichelt Elektronik) to replace the possibly dangerous fan. Although they look similar their connectors are completely different. So I’m now wondering if the first one (the DP200A) wasn’t an original fan at all…?sunon-dp200a-dp201a-front

Sharp PC ROM File Collection (with Hashes)

This short post is to document Sharp PC ROMs I’ve come across so far. I’ve used MD5 and SHA1 checksums to allow their comparison. It would be nice if you could notify me of any ROMs out there that do not match the ones documented here… In an earlier post I’ve described a simple way to dump the ROMs.

  • Sharp CE-150
    Serial 31015xxx
    Memory Area A000-BFFF (8 kB)
    MD5 eb9aa5156c6849890b137799efc50a4b
    SHA1 a3aa02a641a46c27c0d4c0dc025b0dbe9b5b79c8
  • Sharp PC-1500
    Serial 20007xxx
    Memory Area C000-FFFF (16 kB)
    MD5 fbc55a9a8743e619b7709721ff5bcbff
    SHA1 d706d2e69cabbbbbe24f708cb3bc921fa1a2b704
  • Sharp PC-1500 / Sharp PC-1500A
    Serial 20011xxx (Sharp PC-1500)
    Serial 31070xxx – 57012xxx (Sharp PC-1500A)
    Memory Area C000-FFFF (16kB)
    MD5 8ebec8b0ef358645df14807c31df7d06
    SHA1 51a9e37a670b6cf199f0814e96a7e4fda6f44b60

Feel free to contact me and provide me with ROM file I do not (yet) have in my collection. I will also try to make the ROM files available in the next weeks.

I made it: I switched from Eagle to KiCad to make my PCB designs…

Half a year ago I’ve started to use KiCad for new PCB designs I’m working on. I already wanted to try out KiCad for quite some time. Its release 4.0 and the latest changes in EagleCAD (annoying ads and recently being bought by Autodesk) were enough pressure to switch. And what should I say: after dealing with the rather unhandy library management and some cryptic error messages I really now enjoy KiCads workflow.

This post is about my experience with the transition to KiCad as my new PCB designer. It is based on the newest version 4.0 of KiCad and its daily builds via the respective Ubuntu PPAs. Continue reading

Backup your files and keep them in separate physical locations

I know I’m sounding like a moralizer and the suggestion should be a no-brainer. But the flood in Simbach a few days ago once again showed me how important backups are – and how even more important it is to keep them in separate physical locations. I’ve helped friends to remove mud from CD/DVD backups. I’ve extracted hard drives from computers and USB cases, removed mud and water as best as I could. The drives are currently drying at 40°C in an oven. Hopefully they will be readable again…

Oh, I nearly forgot: I’m also currently failing at making backups on a regular basis and even more: my backups are all in one place. 🙁

Jupiter Moon photo taken with a regular DSLR and Zoom lens

Yesterday evening I spontaneously made a photo of Jupiter with my Canon DSLR, a (300 mm) zoom lens, and a tripod. 🙂 I was really surprised that I was able to identify the four Galilean moons Europa, Io, Ganymed, and Callisto.DSLR Photo Jupiter Europa Io Ganymed Callisto

I did not expect much as I made the shot from my balcony with room and street lights on. Here in Munich we have a lot of light pollution. At first I thought the small spots were lens flares. Also chromatic aberration is pretty visible due to the manual focus, but I’m still proud of the photo because I did not expect anything special: I first had to compare it with the software-rendered constellation of the moons around the time the photo was taken (see below) to be sure.

Jupiter Moon Constellation 2016-05-28 2100