PhotographyProjects |
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.
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:
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