GreenPhotons

A simple yet versatile testcircuit for the analod-to-digital converter.

ATmega328P – measuring its own supply voltage II

Post author:uwezi
Post published:2015-06-05
Post category:AVR Computers Electronics Everything Science
Post comments:1 Comment

[latexpage] Here is a brief follow up from yesterday's post on the internal reference voltage VBG of the ATmega328P. I wrote a small test program where I wait for a…

A sketch of the test circuit on a breadboard.

ATmega328P – measuring its own supply voltage

Post author:uwezi
Post published:2015-06-04
Post category:AVR Computers Electronics Science
Post comments:4 Comments

[latexpage] The trick is not new, it is utilized in the AVR transistor tester which you can buy for quite cheap money from China, and it has been discussed in…

Bitmapped math in XeLaTeX output.

XeTeX and your math is bitmapped?

Post author:uwezi
Post published:2015-03-02
Post category:Computers Everything Science
Post comments:0 Comments

I have now been using XeLaTex exclusively for quite a while for all my LaTeX work, which essentially means for everything: lecture notes, lecture slides, lab instructions, letters, reports,... For…

QuizClash

Post author:uwezi
Post published:2014-06-21
Post category:Computers Everything Media
Post comments:0 Comments

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Swedish midsummer flora

Post author:uwezi
Post published:2014-06-21
Post category:Outdoors Photography Plants
Post comments:0 Comments

Today was the Swedish midsummer eve - and I used the free day for a bicycle ride. Hunting geo-caches also brought me in contact with nature. Paris quadrifolia is quite…

MS Outlook Web App - a survival mechanism for Outlook/Exchange refuseniks.

Brave New World

Post author:uwezi
Post published:2014-06-12
Post category:Computers Politics
Post comments:2 Comments

Today my employer, Uppsala University, will migrate our email system from an open-source and Unix based one to Exchange Server. At the same time we are all encouraged to migrate…

IKEA LEDARE lamp with 16.5 W and 1000 lm.

That’s bright!

Post author:uwezi
Post published:2014-06-11
Post category:Electronics LEDs
Post comments:4 Comments

Transatlantic recently asked about a new IKEA LED lamp, the LEDARE with 1000 lm. It comes as a quite big globe (diameter 95 mm) with an E27 socket, an electrical…

A letter to the head of the Engineering Sciences at Uppsala University

Post author:uwezi
Post published:2014-05-09
Post category:Politics Science
Post comments:0 Comments

Impressions from a trip to Germany

Post author:uwezi
Post published:2014-04-25
Post category:Politics
Post comments:0 Comments

Dear fellow resident German citizens!

Is it really and completely normal for you that

the stamp vending machines of the German Post still return the change in worthless stamps only?
a post counter hosted in a supermarket and tended by the personnel of the supermarket closes at 18:30, even though the supermarket itself is open until 20:00?
many shops don’t accept card payments even for larger purchases?
half of the shops which do accept cards only accept certain cards, but no VISA?
you are looked at stupidly when paying with counted cash down to the cent?

(more…)

Are you Schüßlering already?

Post author:uwezi
Post published:2014-03-17
Post category:Media Politics Science
Post comments:0 Comments

This article is about German tv advertisements for sugar pills according to the teachings of Wilhelm Heinrich Schüßler. Since this is a German phenomenon and superstition I will not translate it to English. (more…)