CircuitLab: online schematic editor and circuit simulator

More info at https://www.circuitlab.com/

Try the limited free demo editor here online: https://www.circuitlab.com/editor/

Prices and upgrades: academic (student/educator), hobbyist, engineer: https://www.circuitlab.com/accounts/upgrade/

WikiHouse: an open source construction set – print your own house

wikihouse

WikiHouse is an open source construction set. It’s aim is to allow anyone to design, download and ‘print’ CNC-milled houses and components, which can be assembled with minimal formal skill or training.

Go on and construct your house at http://www.wikihouse.cc ;-)

 

Electromagnetic harvesting device

EMGSM-Harvester-3-640x640 Dennis Siegel

Bremen-based designer Dennis Siegel built special devices that are able to tap into several electromagnetic fields to exploit them, where the energy is stored in typical batteries. Users can then retain the charges from the power supply of any machine, a cell phone or the catenary of a train by holding the harvester directly into the electromagnetic field whose strength is indicated by a LED on the top of the object.

Depending on the strength of the electromagnetic field it is possible to charge a small battery within one day. The system is meant to be an option for granting access to already existing but unheeded energy sources. By exploring these sources it can create a new awareness of the invisible electromagnetic spaces.

Read more at his website: http://dennissiegel.de/electromagnetic-harvester/

Quad Cyclocopter Flight

The video shows stable hover of a novel Vertical Take-Off and Landing (VTOL) aircraft — the Cyclocopter, developed at the University of Maryland by Dr. Moble Benedict, Mr. Joseph Mullins, Dr. Vikram Hrishikeshavan and Prof. Inderjit Chopra.

Cyclocopter utilizes cycloidal-rotors (cyclorotors), a revolutionary horizontal axis propulsion concept which has many advantages such as higher aerodynamic efficiency and maneuverability. One of the key advantages of the cyclorotor is its thrust vectoring capability, which is utilized in the present study for yaw control. The present vehicle has a quad-cyclorotor configuration where each of the rotors is powered using independent motors. Also by using separate thrust vectoring mechanisms for each rotor, each of the thrust vectors could be independently tilted making the vehicle extremely maneuverable.

The cyclorotor design was optimized based on the detailed experimental studies conducted by Dr. Moble Benedict, Mr. Tejaswi Jarugumilli and Prof. Inderjit Chopra. A novel attitude control technique is developed using differential RPM control and thrust vectoring which is also designed to take care of the inherent pitch-roll couplings. For closed-loop attitude stabilization of the vehicle, a proportional-derivative controller was implemented on an onboard 3 gram processor-sensor board. Using this control system, the stable autonomous hover of the cyclocopter was successfully demonstrated. This is the first pure cyclocopter (entire thrust produced from cyclorotors) in the history to perform stable controlled hover after the inception of this concept 100 years back.

For more information contact moblebenedict@gmail.com
or visit http://terpconnect.umd.edu/~moble/index.html