This circuit converts surrounding radio frequency waves to electric power. It can provide 40 Volts at 10 Watts indefinitely. The output power can be improved playing with the antenna. Placing the antenna near large metal objects gives more power. Antenna should be more than 150 feet long wire, placed horizontally as high as you can for best results. The pointing direction also is critical to the output.
38mm x 38mm Laser Engraver build using CD-ROM/Writer on ATmega328p
How to make a DIY home alarm system with a raspberry pi and a webcam — Medium
Fabulous photography piece (irritating tumblr provides no link so let me know if you know the source!)
Colorado DIY Greenhouse, zone 4, food 365 days a year without supplemental heating, cooling or even plugging in a fan, back wall has black barrels to radiate heat.
Arduino Basics: 433 MHz RF module with Arduino Tutorial 1
Tree house that was on Animal Planets show call Tree House Masters. Built by Pete Nelson.