Der Wanhao Duplicator i3.
The future is here...
…it arrived by mail today – and I couldn’t wait…
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Counterfeit chips - again
It's been a while since I exposed my students to counterfeit chips from dubious eBay channels, but now it has happened again. For a couple of projects I provided my…
Pinout of the 2SS52M magnetic sensor according to the March 2016 datasheet from Honeywell.
Don't trust the datasheet!
Today I wanted to use a magnetic sensor for a small project. I had three Honeywell 2SS52M sensors in my stock – a magnetoresistive switch, more sensitive than your usual Hall-effect based ones. For my project it didn’t matter, but since I had these lying around I could as well put them to some use.
Since I didn’t know the exact pinout of these TO-92-similar devices, I asked Google. The first link after the advertisements was the direct link to the datasheet on Honeywell’s homepage.
Happily I realized that it was supposed to have the same pinout as the more common Hall-effect sensors, e.g. the venerable A3144 from Allegro. When my AVR-programmer decided to switch itself off after connecting the finished circuit I got a bit suspicious, but not suspicious enough to not burn up two out of three of my sensors.
What had happened?
Well obviously there is a printing error in Honeywell’s most recent datasheet, dated March 2016. Figure 3 should show the pinout of the sensor, but if you compare it to an older (less fancy) version of the datasheet, which the internet hadn’t forgotten, then you will see the difference. I assume that Honeywell has not changed the actual pinout of the devices in production – let’s see and wait if they will answer my email pointing out their mistake.
Merry Christmas & a new laptop
Unbelievable, but the migration to my new laptop and from Windows 7 to Windows 10 is easier than anticipated.
Among other things this is thanks to the following programs:
- Popfile database exporter
- Firefox password exporter
- TheBat Email with built-in Backup/Restore
| Old | New | |
|---|---|---|
| model | HP Probook 4520s | ASUS N551ZU |
| purchased | 2010-06 | 2015-11 |
| screen | 15.6″ | 15.6″ |
| processor | Intel Core i3 | AMD A10-7400P |
| RAM | 2 GByte | 8 GByte |
| storage | 250 GByte HDD | 250 GByte SSD |
| DVD writer | DVD writer | |
| weight | 2.5 kg | 2.5 kg |
| OS | Win 7 Pro | Win 10 Home |
Is your Firefox getting tired?
I am still convinced that Firefox is a great browser, but lately something went terribly wrong. The browser would take up 1.7 GByte of virtual memory almost immediately after starting, almost independently on the number of open tabs or visited pages.
In order to debug the problem I installed another add-on (after actually reading on the web that add-ons might be the culprit in the first place). The add-on Tab-Data indicates in each open tab the amount of memory used by rendering the contents of the tab.
Well the numbers really did not add up. I usually have around ten open tabs at a single time, and with an average of 2 MByte per tab I really did not come close to 1.7 GByte of virtual memory needed.
The main suspect according to the general agreement on the web is the Ad-blocker. And of course I use an Ad-blocker, because otherwise the web has simply become unusable – blame yourselves with your banners and popups,…
I used to use Adblock Plus but earlier this year I switched to its fork Adblock Edge due to performance and compatibility problems. Yesterday I found the information that Adblock Edge wasn’t recommended anymore and instead it was forked into uBlock Origin ”Finally, an efficient blocker. Easy on CPU and memory.”
And so far I must say that this self-confident message appears to be justified. Firefox is now satisfied with about half the amount of virtual memory compared to before the switch and has not crashed yet…
When booking a flight...
I used to book flights to Germany via agencies like Momondo or Seat24, and they certainly used to offer me a good deal. However, today I noticed that both agencies wanted to charge over SEK 500:- (about €50.-) extra for a single piece of check-in luggage on an Air-Berlin flight from Stockholm to Berlin.
A quick check with the Air-Berlin homepage showed me that I not only would get the same flight for a slightly cheaper price, but that it also included one piece of check-in luggage – as it used to be in the past. Guess how I booked my flight…
Ein Tafelbild aus der abschließenden Vorlesung im Kurs Elektronik I.
Transistors
The briefcase now with increased breadboard area.
A portable electronics bench
A couple of years ago I mounted an Atmel STK500, a couple of breadboards and a power supply in a briefcase. This allowed me to bring test circuits to my lectures and demonstrate them in the class room.
Since I now have abandoned the STK500 in favor of just a USB programmer for AVR microcontrollers, I decided to rip out the STK500 and instead mount even more breadboard tiles inside the briefcase. This is how it looks now:
Under Construction
I just updated to WordPress 4.3.1 and not astonishingly the qTranslate plugin does not work. It is not even developed any further, but I found the new qTranslate-X but that…
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