That was a really nice Sunday… 🙂
Using spreadsheet files for data storage and exchange can lead to the
corruption and even loss of information — sometimes without noticing it immediately. I came across this one too often so I could not help but write a rather long post about this topic.
Sharing datasets with other researchers or collaboration partners is a vital part of the knowledge exchange in a community. This might happen in big scale in form of supplementary material along with publications or in small scale within research groups. In this post I do not want to focus on what is actually shared, but how. Because a crucial but commonly underestimated element when sharing datasets with others is the used data format. Continue reading “RANT: Do not misuse spreadsheets for data storage”
About a year ago (2016) Aliexpress decided to
cripple simplify their search engine. They’ve removed really useful search options and added (at least in my eyes) unnecessary ones.
These useful search options were removed from the search panel but they are still available as URL parameters. I’ve mainly written this post to document these missing options for my everyday searches — but I’m pretty sure others may find them useful as well.
|isUnitPrice||y||Show Price per Piece|
|minQuantity||number||Minimal Quantity in Lot|
|maxQuantity||number||Maximal Quantity in Lot|
|isFreeShip||y||Free Shipping only|
Especially the option isUnitPrice is helpful when searching for the best price per piece and not price per lot.
So when I’m searching for the lowest price per piece within a certain quantity range (here: 10 – 50 pieces) with free shipping I would add to the URL (Example Search):
Side Note: It also makes a difference which keywords you are using when searching. The following three searches will (at least the last time I’ve checked) give different results:
- “stm32f103c8t6 lqfp“
- “stm32f103c8t6 lqfp48“
- “stm32f103c8t6 lqfp-48“
So even slight variations can make a big difference. Unlike the search on eBay, the search on Alibaba and Aliexpress does not split up keywords into smaller ‘chunks’ which are used for searching.
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.
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.)
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… 🙂
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… 😀
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…?
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 “I made it: I switched from Eagle to KiCad to make my PCB designs…”