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PFV Drone, remote control car, VR glasses–the “Science and Technology Exposition” in primary and middle schools is more interesting

Xinhua Guangzhou, March 29 (reporter Lu Ying) to “Science and technology Green Future” as the theme of Guangzhou Huangpu District Primary and secondary school science and Technology Exposition March 28 in Guangzhou Second Sino-Soviet Experimental School (referred to as “the Second Sino-Soviet School”) held. Aerial filming Guangzhou Huangpu District the second Science and Technology exposition of primary and secondary schools.

Xinhua Hair Wooggare Photo Launching ceremony, deputy director of the Huangpu District Bureau of Education Xu Weimin said that today’s world of science and technology, artificial intelligence, “Internet +” and other new technology applications are changing our lives, Chinese manufacturing accelerated to “China-made”.

Science and Technology competition in the final analysis is the talent competition, hope that through the government, enterprises, schools work together to innovate cooperation, so that the flower of scientific and technological innovation in the whole district of primary and secondary school bloom Guangzhou Second Middle School principal Zhang Xianlong was interviewed.

Xinhua Penson Photo “If the current knowledge of mankind is likened to a circle, the larger the known circle, the unknown outside the circle is large enough to be broad enough.” Guangzhou Second Middle School principal Zhang Xianlong to encourage students to maintain a sense of curiosity and awe in science.

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He believes that the current science and technology Exposition is to learn and carry out the party’s 19 spirit “into the campus” vivid practice, through the school-enterprise work together, to achieve universal scientific knowledge, advocating scientific methods, the dissemination of scientific values, promote the scientific spirit of the purpose.

The reporter found that the impact of this activity than the previous session of a wider, the participation of teachers and students is no longer limited to the two middle school students in Su Yuan, covering to Huangpu District major primary and secondary schools in the school teachers and students representatives, exhibitors from the eight from 2017 to 10 this year, the charm of the science and Technology Fair is out of the campus, radiation across the region. Guan Chujun operates four-axis aircraft.

Xinhua Hair Penson Photo The scene, rich in “intelligent” elements of the crossing machine, remote control cars, VR glasses, 3D printing pen to become the most eye-catching technology products. Guan Chujun, the first student of the Sino-Soviet school, took part in the Science and Technology Exposition, saying that he was most interested in flying through unmanned aerial vehicles.

He experienced in the scene hand gestures control of four-axis aircraft, hover, flying and other operating skills attracted many students praise the eyes. Jigsaw: Liang display 3D printed works.

Xinhua Lu Ying Photo

Liang, 9, patiently took a 3D print pen to draw on the paper, and, in less than 10 minutes, she was happy to get a 3D-printed model of the glasses.

Was named 2018 Campus “Science and Technology small talent” Li Ye had won the first prize of Guangdong Province Astronomical Olympiad, he was interviewed by reporters, in the hope of looking at the stars of scientific knowledge, but also need to understand the content of each lesson, down-to-earth, do not let the future of scientific dreams leave regret.

The second China-Soviet school teacher Wang Jianping said, the school students participate in scientific and technological innovation activities also contribute to the improvement of students ‘ performance, 2017, the school entrance examination made a historic breakthrough, the campus average of 15 points of super high protection line, advance batch rate of 99.65%, Pugau rate of 100%. The initiation ceremony took a photo of the guests.

Xinhua Penson Photo

The event by the Huangpu District Bureau of Education and Huangpu District Science and technology industry business and Information Technology Bureau hosted, Guangzhou the Second Sino-Soviet experimental school contractors.

The second Science and Technology Exposition of Guangzhou Huangpu District primary and secondary school The second Science and Technology Exposition of Guangzhou Huangpu District

A Guide to Camera Settings for Photogrammetry Routes in UgCS

The quality of images taken when using UgCS photogrammetry tool is highly dependent on capabilities of the camera used. Thus the photogrammetry route has to be planned around the capabilities of the camera and not the drone.

Cameras usually have five main settings/parameters:

  • shutter speed,
  • aperture,
  • ISO,
  • matrix size
  • focal length.

 

Furthermore the amount of light is crucial for taking good photos. Most cameras are set to adapt to the amount of light.

 

Below is an illustration how shutter speed, aperture and ISO can affect the result:

For best results the camera matrix needs to get as much light as possible. For example:

  • if the ISO of the digital camera is set to a low value, e.g. 100, the resulting photograph will have better quality comparing to when ISO is set to, say – 1600. The higher the ISO – the grainier the resulting image will be. Whenever possible it is recommended to set ISO to a lower number;
  • when there is sufficient light, for best results the camera shutter speed can be decreased, but the speed of the drone – increased
  • If aperture will be increased, it will increase DOF (Depth of field) and the photo will be sharper.

 

Matrix size. The main rule is – the larger the size of the matrix, the more sensitive the camera. That’s why a DSLR camera with a full-frame matrix will give higher quality photos than a cheap camera with a small matrix.

 

Focal length. If the focal length is increased, then exposure time or drone speed should be decreased. Otherwise the photos will be blurry.

 

Knowing the camera settings, it is possible to anticipate how they affect the results of a UgCS photogrammetry mission, adding two main conditions for a drone flight: speed and altitude.

 

Let us analyze 3 common types of illumination during daytime:

  • sunny day with clear skies,
  • sun mixed with clouds,
  • cloudy day

Note – It is not recommended to fly in low-light conditions such as during twilight or early morning.

 

Sunny day with clear skies

 

On a bright sunny day when there is a lot of light, a test flight with DJI Phantom 4 (GSD = 2.5, True focal length = 3,6 mm, resolution – max (4000×3000 px.) was made with the following settings:

  • Flight speed = 6 m/s,
  • ‘Camera by time’ action set,
  • the box ‘Additional waypoints’ – unchecked,
  • ‘Stop&Turn’ turn type,
  • Overlap – default.

 

The route calculated by UgCS had the following parameters:

  • Height – AGL ~ 55 m;
  • Trigger interval = 3 sec;
  • Duration est. – 13 min;
  • The calculated area – about 10.39 ha.
  • Parameters of the photogrammetry tool: size of footprint – 100.00 m x 75.00 m.
  • Parameters of the photogrammetry tool: number of waypoints 44, number of passes – 11
  • Camera triggering by time: Automatically calculated parameters – 212 shots, every 3.00 s

 

The camera was set up in the field with these parameters (in Manual mode):

 

  1. Minimal ISO number;
  2. Minimal Shutter speed (1\160 and less);
  3. Autofocus;
  4. Phantom 4 fixed aperture = f2.8

 

The particular values have to be adjusted individually according to illumination. The result of the test flight was excellent: photos were clear and sharp. Only one battery had to be used for the flight with a small reserve left.

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If the GSD would be decreased, flight altitude will also be decreased. The true focal length will remain constant; therefore, the drone’s flight speed has to be decreased or the speed of the shutter increased (exposure time decreased). The minimal trigger interval for DJI Phantom 4 is 3sec, therefore the flight speed has to be decreased. If GSD is decreased to 1.5 cm, then drone’s speed has to be decreased to 2 m/s (DJI has this limitation on minimal flight speed for auto mode). Covering the same test area will require 4 batteries instead of 1 and the flight height at 20m AGL will be unsafe due to hazards such as trees.

Downside of good illumination – photos can have sharp shadows, affecting the productions of orthophoto and 3D models.

 

Sun mixed with clouds

The level of cloudiness has to be monitored and the settings have to be adjusted accordingly – the speed of drone and shutter speed has to be decreased, other settings can be left as previously described. The ISO value can be increased if necessary.

 

Second option is to use the action ‘Set camera mode’ with ‘Shot’ parameter and additional waypoints. If interval between waypoints is less then 70-90m, it is useless to increase drone’s speed – the drone will not have enough distance to reach the speed set. Mostly it is recommended to use the default flight speed – 5 m/s.

 

Cloudy day

 

The main thing to take into account when flying on a cloudy day is to fly with ‘Set camera mode’ action to ‘Shot’ parameter and additional waypoints. Shutter speed can be set to a longer time, but should not exceed 1/60. Furthermore the ISO value can be increased but shouldn’t exceed 400.

 

As you can see, the capabilities of the drone exceed those of the camera. But the effectiveness of entire drone system is determined by the least efficient part. Therefore, many professional surveyors use DSLR cameras with wider lens aperture on drones with several batteries to deliver optimal and efficient result.

ZTW Spider 12A OPTO Multirotor ESC

ZTW is one of the two largest ESC manufacturers in China, and one of the largest OEM ESC suppliers to many RC model manufacturers and dealers worldwide.
TW Spider Series ESCs are high quality speed controllers designed specifically for multi-rotor aircraft. Flashed with popular SimonK firmware for multi-rotor. Spider Series ESCs feature up to 600Hz refresh rates for an incredibly smooth yet crisp flight controller response. These ESCs also feature excellent throttle linearity without sacrificing a rapid, crisp response to throttle input. As usual. Spider Series ESCs come standard with the ZTW quality, performance, and reliability you have come to trust.

Flashed with SimonK firmware (v11.9.2013)
Extremely low internal resistance
Super smooth and accurate throttle linearity
Safety thermal over-load protection
Auto throttle shut down in signal lose situation

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Supports high RPM motors
Power arming protection (prevents the motor from accidentally running when switched ON)
Use new generation of the MOSFETs to make sure the ESC with low heating and more reliability

Specifications
Continuous Current: 12A
Burst Current(10s): 20A
Battery: 5-12NC/2-4 Lipo
Max Power: 880W
Length: 26mm
Width: 15mm
Height: 6mm
Weight: 8g

ZTW FLASH 30A BLHeliS Brushless ESC

eatures:
Using BLHELI-S firmware.
Super smooth and accurate throttle linearity.
Support high RPM motors, can be matched with most of the motors in the RC market.
Use new generation of the MOSFETs to make the ESC low heating and high reliability.
Capable of ONESHOT42/ ONESHOT125O/MULTISHOT feature to work better with your flight controllers.
Fast response to throttle.
No settings needed, just plug and play.

Specifications:
Constant Current: 30A
Peak Current: 40A(10s)
Voltage: 2-4S
Software: BLHELI-S
BEC: NO
Color: black
Net Weight: 8.7g

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Package Information:
Package size: 12.5 * 12.5 * 0.5cm / 4.9 * 2.2 * 0.2in
Package weight: 21g / 0.7oz
Poly bag package

Package List: RM7207
1 * ZTW Flash 30A Brushless ESC

1 * Manual Instruction

ZTW Gecko 150A High Voltage Aircraft ESC for Rc Airplane

This is a high voltage version Gecko ESC supports up to 12S LiPo, but no built in BEC.
ZTW Brushless ESC
This is a high-quality, efficient brushless electronic speed control with an integrated switch-mode BEC. It can operate without the need for a separate receiver battery to power your servos and receivers, saving you weight and complication. GECKO series also include ESC OPTO for giant flying. This series of ESCs also features an exposed, finned heat sink aluminum case with lightweight plastic end caps. Additional features include safe power arming along with advanced programmable, data logging system, low voltage cutoff, braking, timing, throttle input range, and more, making this series truly a pro series speed control.

As the development of the electronic and popular demand of the market, our BEC has been specifically  RC airplane designed for extreme aerobatics and therefore has the capability to support the higher current applications to eliminate the possibility of unwanted shutdowns, and is also capable of supporting continuous simultaneous multiple servo operations typically found in CCPM equipped hardcore 3D E-helicopters.

Features
Data logging system such as temperature, voltage, current, RPM,
SBEC Voltage Output 5.0, 6.0, 7.4, 8.4V adjustable
Advanced Governor Mode and soft start
High SBEC Current Output, continuous 8A and burst 16A, designed to meet your high current application
Power arm protection, over-heat protection, low-voltage protection and lost-signal protection
Secondary sub-menu setting by LCD program card or PC interface
Firmware updating by PC interface
Unique metal shape designing gives your new fashion visual impact.
Super smooth and accurate throttle linearity
Support and match with most of the motors, including high RPM motors
Programmable motor timing
Utilizes new smaller MOSFET technology to minimize weight
Finned heat sink
programmable throttle input range
Anti-spark circuit eliminates (HV OPTO version only)

Specifications
Output: Continuous Current 150A ,Burst Current 180A for 10 seconds
Battery : 18-38 NiXX / 6-12S LiPo
Weight: 120g
Size: 46x65x16.6mm (WxLxH)
No BEC

ZTW Seal 300A OPTO HV 14S for RC boat

We all know that that boaters crave for more power than cars and airplanes and ZTW has come up with a whole new way to put the power to the water – The new SEAL line water-cooling brushless speed controls for marine applications. ZTW uses new FETS that offer less resistance and less heat dissipated. Even so they added more water-pipes to increase the cooling area to dissipate Freewing RC airplane  the heat faster and better so as to bring a even more incredible power levels without any risk of frying the controller.

Well designed MCU with efficient code makes for faster sync and accurate control. Beside the performance they have also bring you a whole new fashion looking marine ESC.

This is their SEAL marine speed controller. Quality, performance and fashion are what they are all about.

Features:
1. Extremely low internal resistance
2. High efficient three pipe water cooling system
3. Super smooth and accurate throttle linearity
4. Over temperature protection
5. Auto throttle shut down in signal lose situation
6. Supports high RPM motors
7. Power arming protection (prevents the motor from accidentally running when switched ON)
8. New Advanced programming software

Specifications:
Continuous Current – 300A
Burst Current (10s) – 180A
Battery – 5-18 NC/2-6 LiPo
BEC Output – 5.5V/3A
Width – 65mm
Length – 46mm
Height – 23..5mm
Weight – 780g

ZTW Polaris 25A 2-4S BLHeli-S Brushless OPTO ESC

Features: 
BLHeli-S, better startup than BLHeli.
Supports high KV motor and BLHeli REV 16.0.
Support flight control like Naze, CC3D, Kiss, F3 and F4.
Autodetect Oneshot 125, Oneshot 42 and Multishot.
MCU-EFM8BB21F16 and hardware PWM make smooth throttle response.
This is new generation ESC for entry level and middle level FPV racing.

Specifications:
Brand: ZTW
Item name: Electronic Speed Control
Model: Polaris 25A 2-4S BLHeli-S ESC
Continuous current: 25A
Burst current(10s): 35A

hobbywing ESC Zgemma star H.2S

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Zgemma Star 2S

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BEC: NO
Battery NiXX/Lipo: 5-12NC/2-4S Lipo
Width: 14mm
Length: 27mm
Height: 5mm
CPU: EFM8BB
Programmable: Yes, autodetect Oneshot 125, Oneshot 42 and Multishot
Software: BLHELI_S
Weight: 6g

There may be some deviation due to manual measurement.

Package information:
Package size: 12.7 * 12.5 * 2cm / 5 * 4.9 * 0.78in
Poly bag package

ZTW Beatles 70A Brushless ESC

ZTW披头士系列  ESC是固定翼的起点级产品线。这一系列产品是专门为价格和性能敏感的初学者设计的。所以开箱即可使用,每个默认设置都是为了方便客户,无需编程。Freewing飞机。它具有重量轻,体积小,超平滑,高性能,低成本和性能最佳的水平产品。

 

hobbywing ESC Zgemma star H.2S

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Zgemma Star 2S

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特点:
极低的内阻
超级流畅和准确的油门线性
安全热过载保护
自动油门信号关闭输的局面
,支持高转速电机
功率武装保护(从开机的时候不小心运行防止马达)
新的高级编程软件

规格:
长68毫米
宽37毫米
高14 毫米
重量80克

输出连续70A
突发80A(10s)
电池2-6Lipo / 5-18NC
BEC输出5.5V / 3A

ZTW Spider 12A OPTO ESC

ZTW Spider OPTO ESCs

1-1FZ40U037

More info: http://www.ztwshop.com/product/ztw-gecko-series-brushless-esc/

are quality speed controllers and designed for simple installation and easy setup. These ESCs have proven to offer excellent performance in Multi-rotor applications. If you are starting out in Multi-rotors and need an easy-to-install solution that is tested and proven to work with Multi-rotor craft then these speed controllers have you covered. The ZTW Spider 12A OPTO ESC features a very smooth yet linear throttle response, without sacrificing a rapid, crisp, response to any throttle input. Super fast Refresh Rate up to 600Hz make these a very smooth controller.

1-1FZ40UJ1-lp

FEATURES:

  • Extremely low internal resistance
  • Super smooth and accurate throttle linearity
  • Safety thermal over-load protection
  • Auto throttle shut down in signal loss situations
  • Supports high RPM motors
  • Power arming protection
  • Use new generation of the MOSFETs

REQUIRES:

  • Direct connection to motor or bullet connectors
  • Battery connector

NOTES:

This 12A ESC has bare leads only.

 

ZTW Gecko 150A ESC OPTO High

This ZTW Gecko series ESC is a high-quality, efficient brushless electronic speed control. It can operate without the need for a separate receiver battery to power your servos and receivers saving you hobbywing esc weight and simplifying your electronic connections (but a separate BEC is required, see below). The Gecko series includes an aluminum heat sink body which is lightweight and helps dissipate heat more efficiently. If you are looking for a top of the line, full-featured ESC at a competitive price, the ZTW Gecko is the logical choice.

FEATURES:

  • Data logging system such as temperature, voltage, current, and RPM
  • Advanced Governor Mode and soft start
  • Power arm protection, over-heat protection, low-voltage protection and lost-signal protection
  • Secondary sub-menu setting by the LCD program card or your PC
  • Super smooth and accurate throttle linearity
  • Support for most motors, including high RPM motors
  • Programmable motor timing
  • Utilizes new smaller MOSFET technology to minimize weight
  • Aluminum finned heat sink
  • Programmable throttle input range
  • Anti-spark circuitry (on HV OPTO models only)
  • ESC firmware and program settings can be updated via PC connection (USB adapter sold separately)

INCLUDES:

  • ZTW Gecko 150A ESC OPTO
  • Pre-installed EC5 Connector (power connector) and 5.5mm bullet (motor connector) for your convenience
  • Instruction Manual

REQUIRES:

  • ZTW 10A BEC/UBEC -

OPTIONAL:

  • ZTW LCD Programming Card