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ZTW Polaris 35A OPTO BLHeli_S brushless speed control for Multirotor Drone

ESC ZTW Polaris are the newest products from ZTW,  more lightweight and more powerful.  ZTW Polaris 35A is super tiny & weight is only 7G , this is a madness ! . ZTW Polaris is breaking all rules, from now on ESC can be ultra mini size a super powerfull. It can work with all protocols like one shot 125/42 , multishot etc… . If you are looking for super light and efficient ESC for sure this one could be for you, Polaris been made for Freestyle and Racing Drones.

ESC ZTW Polaris 15A
Power: Const 15A / Burst 25A
Voltage 2s-4s
Software: BLHELI_S
Chip: MCU-EFM8BB21F16
Size(mm): 14*27*5.5 (W*L*H)
Weight: 5.5g

ESC ZTW Polaris 25A
ESC ZTW Polaris 15A
Power: Const 25A / Burst 35A
Voltage 2s-4s
Software: BLHELI_S
Chip: MCU-EFM8BB21F16
Size(mm): 14*27*5.5 (W*L*H)
Weight: 7g

ESC ZTW Polaris 35A
ESC ZTW Polaris 15A
Power: Const 35A / Burst 45A
Voltage 2s-4s
Software: BLHELI_S
Chip: MCU-EFM8BB21F16
Size(mm): 14*27*5.5 (W*L*H)
Weight: 7g

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source from: http://www.ztwshop.com/product/airplane-brushless-esc/ztw-polaris-series-/

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An underactuated propeller for attitude control in micro air vehicles

 
We derive thrust, roll, and pitch authority from a single propeller and single motor through an underactuated mechanism embedded in the rotor itself.
 
This allows new types of conventionally-capable micro air vehicles which only require two motors for practical control. This contrasts with the many servos and linkages of conventional helicopters or the many drive motors found in quadrotors.
 
Conventional UAV formats applied to smaller and smaller micro air vehicles lead to significant design challenges. A swashplate-controlled coaxial helicopter must find room in its mass, size, and cost budget for four actuators (two big rotor motors, two swashplate servo motors) and a complex linkage assembly. A quadrotor must similarly support four motors and face the practical problems of rapidly shrinking rotors. Our new rotor system provides significant system simplifications while retaining all the advantages of cyclic control.
 
 
The main motor directly drives the propeller hub, which is itself connected to the propeller blades by two inclined hinges. The hinge geometry couples blade lead-and-lag oscillations to a change in blade pitch. Instead of only driving the motor with a steady torque, we add a sinusoidal component in phase with the rotation of the rotor to induce a cyclic pitch variation. The amplitude and phase of this control signal determines the magnitude and direction of the vehicle response.
 
This paper presents a new concept a MAV propulsion system capable of using a minimum number of actuators in dual rolls. This simplifies and lowers the cost of MAVs. Removing complex swash plates and reducing the number of actuators reduces the number of parts, thus increases reliability (fewer parts to fail), reduces maintenance costs, reduces vehicle mass, and reduces manufacturing costs. Experimental results for the actuator response are presented along with a demonstration of a full flight vehicle using this system for both active stability and maneuvering.
 
 
Conclusion
We have shown that a hinged, underactuated rotor can mimic the behavior of traditional cyclic control systems in small MAVs without requiring either additional servomotor actuators or complex linkage systems. Both the magnitude and response time of the resulting control moments are sufficient for stabilizing and maneuvering a small, 358 g coaxial MAV.
 
In future work, we wish to develop a technique for determining optimal geometric design parameters for power-efficient operation given application constraints on required moments, thrust, and rotor size. This will allow us to evaluate the system-level power efficiency of this technology verses other control strategies while taking into account the associated actuator and structure material weights. The ultimate aim of this technology is to achieve reductions in system complexity and actuator count that may enable future small, simple, and low cost micro air vehicles.


J. Paulos and M. Yim, “An underactuated propeller for attitude control in micro air vehicles,” in Intelligent robots and systems (iros), 2013 ieee/rsj international conference on, Tokyo, Japan, 2013.

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Job Opportunity – Los Angeles area

Hi Everyone - 

My name is Arnold i'm a technical recruiter here in Southern California. I'm currently working with a client in the San Fernando Valley who is looking to hire someone who has Pixhawk/PX4 experience. This would start off as a contract but could go permanent. Please take a look below. 

Location: San Fernando Valley 

Length: 6 months possibly goes full-time

 

Product – Our client develops unmanned aerial systems (UAV).

Duties -Our client is looking for a software engineer who does programing and development using pixhawk/px4 software that will be used in a UAV.

Necessary Skills:

-PIXHAWK/PX4 A MUST HAVE
- Embedded Firmware/Drivers
- linux (using NuttX or Raspbian)
- c/c++
- ARM (they are using STM 32 cortex M4)

Desired Skills:
- UAV
- motor control

Please send resumes to: 

Arnold Melgar

arnold_melgar@oxfordcorp.com

818-878-3152

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Dronee Geotagger : In-browser image geotagger

many drone applications such as photogrammetry, orthophoto generation, 3D terrain modeling etc require to geotag images. There is some geotagging software but we found them complicated to use.

we developed DroneeGeotagger.

DroneeGeotagger in-browser image geotagging software. it is super simple to use and it works in-browser that means no cloud involved. Your data doesn't go to the internet. it is secure )

DroneeGeotagger geotags 1 image in around 0.5 seconds. 

How does it work?

For DroneePlane users

1. Open the browser and go to DroneeGeotagger

2. connect to DoroneePlane's wifi "Dronee",  it will automatically get GPS coordinates from the drone and will list in the browser.

3. Take images from camera and "drag and drop" inside the DroneeGeotagger. It will list images with at least order

4. Press "Geotag all" button. Geotag will start and geotagged images will be saved on the desktop.

For other drones users

1. Open the browser and go to DroneeGeotagger

2. Drag and drop CSV file inside the DroneeGeotagger.It will list GPS coordinates with at least order.

3. Take images from camera and "drag and drop" inside the DroneeGeotagger. It will list images with at least order

4. Press "Geotag all" button. Geotag will start and geotagged images will be saved on the desktop.

For more information visit our blog

Note: Dronee Geotagger is completely free to use.

To get notified by Dronee's latest news, follow :

Dronee Youtube channel

Dronee facebook page

Cheers,

Tomi

www.dron.ee

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Dronee Geotagger- Geotagging images in browser.

In-Browser super simple to use Geotagger to make life easier. it is completely free to use.

if you use Dronee Plane it is even easier. 

You need to connect to DroneePlane wifi on a computer and dronee geotagger automatically will take GPS coordinates from the drone and will appear on DroneeGeotagger page.

Only need to take images from camera, drag and drop into the browser.   

Then press " Geotag all" button. It will automatically geotag photos with coordinates with least order and will save geotagged images in the desktop.

For other drone users:

Drag and drop CSV file (Dronee Geotagger automatically will fill GPS coordinate in columns)

then drag and drop image files 

Then press " Geotag all" button. It will automatically geotag images with coordinates with least order.

Enjoy and feel free to leave feedback

Cheers,

Tomi

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