http://arduino.cc/forum/index.php?topic=122359.0;wap2
see post at bottom of thread about SPI
http://arduino.cc/forum/index.php?topic=3606.0;wap2
motor current sensing
Digital signal processing and filtering
http://www.dustynrobots.com/news/digital-signal-processing-and-filtering-motor-current-sensing/
Census dotmap
A dot for every person in the United States
By Brandon Martin-Anderson
(The map appears to be broken as of 6/2014)
http://bmander.com/dotmap/index.html
Circuit bending ideas
By ne7 of Napalm, Rebels, Scoopex and Triad at Zine Behind the Scene
http://zine.bitfellas.org/article.php?zine=13&id=1
Sim cards
This company specializes in m2m (machine to machine) communication.
Also, http://twilio.com can send and receive SMS messages from web apps.
More upconverters
Two sources for HF to VHF upconverters for SDR experiments.
At Reddit /r/RTLSDR
http://www.reddit.com/r/RTLSDR/comments/12ebes/informal_upconverter_comparison_janielectronics/
Remote SDR using Raspberry Pi & RTL_TCP
AR.Drone RC mod
Extends flight range to 1.5 – 2.5 kilometers
By Albert at Dronehacks
http://dronehacks.com/2011/08/21/ar-drone-rc-mod-extends-flight-range-to-1-5-2-5-kilometers/
USB stick with GNU radio
An early example of rtl-SDR.
By Al Williams at Dr. Dobbs
http://www.drdobbs.com/embedded-systems/soft-radio/240007489
