Calendar

August 2020
M T W T F S S
 12
3456789
10111213141516
17181920212223
24252627282930
31  

Categories

Active supporter of WikiPedia
Support Wikipedia

Geocaching

Profile for uwezi

Temperature measurements with an NTC thermistor

sagecell.makeSagecell({“inputLocation”: “.sage”}); Following a discussion on Facebook I put here an online tool to calculate the output of a voltage divider consisting of a fixed resistor and an NTC thermistor following a first order Steinhart–Hart equation.

The calculations are based on a voltage divider where either the voltage over the NTC or over […]

Continue reading Temperature measurements with an NTC thermistor

Top deal of the week?

Today I received a newsletter from the publisher Elektor. I am offered a special deal on a Peltier power generator which can power an LED light from a small candle. And this for an astonishing price of €99.95 instead of the normal price of €119.95.

Great offer from Elektor.

I’ll have to […]

Continue reading Top deal of the week?

Assembling an USBasp

…at eight times timelapse it only takes 4 ½ minutes…

http://www.sciencetronics.com/greenphotons/wp-content/uploads/2016/11/20161102_usbasp_480.webm

Nerd or not?

Today there was a geocaching event celebrating Nerd Day. I must admit that I wasn’t aware of the significance of today’s date, but I also knew that I can probably be considered being a nerd.

In the early days of the internet, while still writing my master’s thesis in Kiel, I already scored high […]

Continue reading Nerd or not?

The end of a short story in life…

This afternoon the birdsnest outside my office window has been plundered by a crow or raven. Even though the parent-birds got reinforcement by two other fieldfares they never had a chance.

The small birds only had a few days of life but they somehow enriched my days.

…they just had a few […]

Continue reading The end of a short story in life…

BirdCam – feeding in slow-motion

Because there was a problem with the Raspberry Pi again today, I took the opportunity to film my fieldfares live for a short while. In this slow-motion video you can see how first the female arrives at the nest with a fresh worm. A short while later also the male arrives with a beak […]

Continue reading BirdCam – feeding in slow-motion

Hatching time

“I’m hungry!”

Ten days Mrs Fieldfare has been sitting in her nest – today was the big day: until late afternoon three eggs had hatched. Now also Mr Fieldfare has to show some effort who has not been much around the nest lately.

Mr and Mrs Fieldfare at the nest.

[…]

Continue reading Hatching time

BirdCam v4

It took four attempts to finally get a suitable webcam to observe the bird’s nest outside my office window. Most cheap webcams, even those which show off with true 720p HD resolution simply cannot cope with the different outdoor lighting conditions over a full day.

After a lot of testing and research on the […]

Continue reading BirdCam v4

Setting up webcam exposure under linux

I had some problems with fswebcam to set the automatic exposure. The exact way how to enter certain parameters is not clear from the lacking documentation, but it works fine if you set parameters through another command line tool.

This is the script behind BirdCam:

#!/bin/bash DATE=$(date +"%Y-%m-%d_%H%M") v4l2-ctl -c exposure_auto=1 v4l2-ctl -c gamma=5 […]

Continue reading Setting up webcam exposure under linux

Fieldfare

Nils Paakkonen was probably right, my new neighbors outside the office window is a pair of Fieldfares.

This morning the whole family was at the nest: