Robotics and drones

categories

 * SACAA
 * http://sasecurity.wikia.com/wiki/Category:Uav_airframes
 * http://sasecurity.wikia.com/wiki/Category:Uav_project
 * http://sasecurity.wikia.com/wiki/Category:Uav_quad
 * http://sasecurity.wikia.com/wiki/Category:Gentlenav
 * http://sasecurity.wikia.com/wiki/Category:Robotics
 * http://sasecurity.wikia.com/wiki/Category:Rcgear Long range radio gear, rc hobby, servo's tx,rx etc.
 * FPV

Vibration isolation
Quad_frames and Vibration

Intro
Combine www.Skydrone.aero video over cellar networks with suitable UAV project and fitted with Thermal imaging cameras.

Gentlenav Matrix pilot is the only project able to loiter an UavAirframes in a circle above a target, making the IMU dizzy proof. It is the preferred solution for fixed wing Inverted v-tail navigation using a Logo script, DCM algorithm. Gluon Pilot and Paparazzi uav navigates a plane uses EKF. Gentlenav determined that that there is a 0.08sec delay in the magnetometer readings and compensated for this using feed-forward control and enabled automatic in-flight gyro calibration. Eliminate RF interference (http://sasecurity.wikia.com/wiki/Category:Wifi_construction), place pcb inside plastic box, painted with copper-paint, constructing a http://en.wikipedia.org/wiki/Faraday_cage.

Copy the Quad frames flexacopter wire-rope and DJI Wookong IMU on aluminium block idea for the Vibration problem. The quad frame as a system should function as a low-pass filter, the idea is not to stop all vibration but to cut-off high frequency vibration preventing IMU saturation and distortion of video. Diydrones are aware of the fact that the wire-rope concept(http://www.flexacopter.com) solves the vibration issue but are reluctant to copy the idea. Experimentation showed that it is a specific thickness of foam under the IMU that cuts of high hz vibration, packs of vibration absorbing gells will not turn the quad frame into a low pass filter. Different types of material gell, foam or metal will depending on form enable the quad frame to function as a low pass filter. The resonant frequency of the IMU orientation sensor is the higher frequency ranges, which results in gyro saturation if the quad frame acts as a high-pass filter.

As an UavAirframes circles in a spot its IMU gets 'dizzy' or saturated but Gentlenav solved the problem. Fixedwing speed control is achieved using the kinetic energy of the craft, thus a plane will dive to gain airspeed in addition to increasing throttle. Whitenoise on the IDG500 analogue gyro is eliminated by oversampling(8000 per sec) but the analogue gyro's are no longer mass produced and the switch to digital IDG6000 with sample rates close to 1meg is required for white noise reduction, but this is close to the limit of the databus on the CPU's used.

In strong winds the effective airspeed measured by the air speed sensor differs from ground speed, Gentlenav solved this by maintaining a constant ground speed irrespective of wind speed. For UAV'S to be useful it must be able to loiter in a loop over a target for any point of time and be able to maintain a path in any direction at an angle to a strong cross wind. The UAV will have to point its nose in a direction away from its intended path to compensate for the wind, meaning the vector calculations integrating GPS and magnetometer readings will be different than if there were no wind. In no wind the nose of the UAV is pointed in the desired direction of travel. Openpilot, Diydrones arducopter and Gluon Pilot fixed wing code can't compensate for cross winds, their code only works in calm weather. (if this gets fixed post a comment under Gluon Pilot). Diydrones arducopter obtained the copyright on Aeroquad.

Openpilot using EKF had a major edge over the DCM algorithm implementation of QuadroCopter, Quad frames until William Premerlani figured out the correct mathematical model of a quad. The diydrones DCM is now the preferred solution over Openpilot, previously openpilot has a distinct edge.

Tridge, a lecturer implemented major sections of Premerlani's Gentlenav code(PIC code) for the ARM board at Diydrones arducopter. Euler notion should not be used due to sign reversal when turning through 90degrees. Multi Pilot Diydrones arducopter

Links
Add http://code.google.com/p/afrodevices/ doc sometime UavAirframes A few hundred UavAirframes fitted with cheap Gentlenav from Uav robotics and un-cooled $3500 ThermalImagingCameras streaming images over a 400Mhz WiMax link, patrolling the major Afghanistan routes will prevent IED attacks.With FpGa real-time image stabilization is done on the Mpeg4Compression, DVR stream, negating cross winds destabilizing the video image. This same principle can stop crime in South-Africa as well as piracy on the high sees. South-African law is tolerant of civilian drone usage - Drone swarming.
 * Carbon tubes Spin own carbon tubes at 10% the cost of commercial versions. http://www.xwinder.com/
 * Uav links
 * Igus robotics
 * Uav suppliers
 * Hardware hacking, Gears robot(belts, pulleys, servo's building blocks(modular))
 * Electric Car
 * South Africa uav http://www.steadidrone.com/
 * Gentlenav Preferred opensource UAV project.
 * Uav clones
 * Maxrotor Kickstarter project
 * Autoquad uav
 * Uav robotics
 * Battery rc
 * Quad frames
 * Virtual robotics Quad IMU
 * Multiwii quad FreeIMU code project
 * Vibration Reducing vibration to the IMU
 * RoboTics, MannedSystems combine with Antenna tracking
 * OsmcRobotics GPL project on Yahoo groups.
 * Uav airframes
 * Gimbal
 * Antenna tracking
 * Rhino uav protection
 * CncControllers
 * Uav pepperball gun, Uav power generation
 * http://www.ohwr.org/projects/white-rabbit
 * UAV Outback Challenge Use same image processing ideas to look for intruders on farms

Human hearing
Drive the electric motors at 20khz above the range of human hear with PWM. Existing driver boards drive motors at 4khz to conserve power, but it makes a noise within the human hearing range.

https://www.youtube.com/watch?v=-MG4z6rnbpE Drill holes in aluminium Quad frames to reduce weight, much more cost effective then carbon legs.

Books
http://www.amazon.com/dp/B00NOGSQPS

http://makezine.com/review/

http://makezine.com/magazine/make-39/open-source-robotics-a-buyers-guide/