Photography
Projects
SDR-Test (Earth-signals) for Radio-Astronomy (2013-06-29):
SDR (software-defined radio) is easy, sound-card (VLF) and/or TV-/radio-USB-stick (LW to 1.5 GHz) plus software, no extra receiver necessary.
DAB-USB-Radio-Stick (20 Euro):
VLF - 3 m copper-wire into mic-input (photo external usb-sound-card):
Without sun-radiation, our ionosphere rapidly decays and this affects the propagation of radio signals.
A simple wire-antenna works well, but a loop-antenna is good for direction finding and the signals are a little stronger.
- http://www.amazon.com/Observing-Sun-Practical-Astronomy-Handbooks/dp/0521056365/
- http://www.cambridge.org/fr/knowledge/isbn/item1118782/
- http://en.wikipedia.org/wiki/Software-defined_radio
- http://www.qsl.net/dl4yhf/spectra1.html (SDR Software, e.g. mic-input-VLF)
- http://www.hdsdr.de/ (SDR Software, e.g. TV-USB-stick)
- http://www.vlf.it/
- http://en.wikipedia.org/wiki/Sudden_ionospheric_disturbance
- http://solar-center.stanford.edu/SID/activities/ionosphere.html
Simple earthquake sensor: (2013-06-16)
I hot-glued a screw into the center of a speaker. It is sensitive enough to detect cars driving by:
Monitoring magnetic fields (2013-06-12)
Monitoring Earth's magnetic field (or something else?)
Interesting earth-data-changes +/- 50..150 nT, so this needs more work.
I know, the sensor-test-app has a typo (Tesslar vs. Tesla)
http://www.swpc.noaa.gov/rt_plots/bou_12h.html
I bought magnetic sensors (best resolution 15 nT):
GPS: Arduino and BeagleBone Black: (2013-06-04)
Arduino + GPS-module
It works! LCD shows: latitude/longitude and utc-time (13:49:25)
It works!I added UARTs to device-tree (edit, compile and copy) + enabled overlay, because there is no(!) ttyO1... in my Ångström-linux.
More about device-trees:
- http://devicetree.org/Device_Tree_Usage
- http://j.mp/17GQF6M (-> docs.google.com)
