"When it comes to aerial drones, most people recognize that its dimensions are usually: how good the picture quality is, whether the video is stable, how long it can fly and how high it can fly.
Are these indicators important? Of course it's important.
Its importance is just like when we talk about whether a car is fuel-efficient, comfortable to drive, and fine workmanship.
However, the pace of innovation may sometimes be faster than people think. When we are still talking about these traditional topics, history is quietly opening a new chapter.
Not long ago, you may still have the impression that after the advent of ELF 4, which can realize forward-looking obstacle avoidance and visual following, players talked more about how to use the "intelligent shooting" function.
The "pan tilt hand" who uses machines to do the work can shoot the professional composition and mirror movement track that needed professional pan tilt hands in the past. The Mavic Pro as like as two peas can be folded into a size of a mineral water bottle, and the smart beat function is exactly the same as the spirit 4.
When we were still praising the small size and powerful functions of mavic pro, spark smaller than mavic Pro came. It was only the size of a palm of a hand and could take off and land on the palm of the hand.
It not only has all the "smart beat" functions of mavic pro, but also is smarter than mavic Pro: it supports gesture control (without mobile phone or remote control).
The storage box of spark is standard, which can place one spark and two additional batteries. With the battery on the spark body, it can hold three batteries in total.
Spark is equipped with a battery capacity of 1480mah, a voltage of 11.4v (belonging to high-voltage lithium battery) and an energy density of 16.89wh, which complies with civil aviation regulations and can be carried on the aircraft.
Spark battery is small and exquisite in design, with floor mats, external charging contacts, power indicator LED lights and fixed latches. After being installed on the spark fuselage, it can be integrated with the fuselage and has a good sense of integrity. It's also very easy to remove the battery from the fuselage. Hold the battery latch and pull it back to take out the battery.
There are 6 screws for fixing spark, of which 4 are in the battery compartment and are hidden after the battery is installed. The other two fixing screws are behind the head pan tilt, and the hiding degree is also very good. If you don't observe carefully, you can't see an obvious exposed screw on spark.
There are 6 output contacts of the battery, two of which may be used to check whether the battery is genuine.
This photo shows a high-power charger and battery housekeeper. This configuration is only available in spark all-round suit. Of course, it can be purchased separately if necessary. If the spark stand-alone version is purchased, the battery can only be charged through the USB interface (the charging speed will be slow, and it is inconvenient if there are many batteries).
The charger also provides two 2A USB interfaces.
The output power is 50W, the output voltage is 13.05v and the current is 3.83a.
Back logo of spark battery housekeeper
The charger is connected to the battery manager through this special plug
Panorama of spark
Focus on the bottom of the fuselage. There is a "Tian" shaped contact at the bottom of the battery, which is an external charging contact. So far, Dajiang has not announced the use method of this contact.
The down looking vision system is composed of a camera and an infrared sensor (one receiving and one transmitting). The camera is used to obtain the position information of the aircraft (valid within 30 meters of flight altitude).
The infrared sensor is used to judge the current altitude (the measurement range is 0m to 8m), which is an important functional guarantee for spark to complete fixed-point and fixed altitude flight indoors (without GPS).
As we all know, in order to achieve the effect of accurate height setting, ultrasonic sensors can also be used, which are used in spirit 3 and spirit 4.
Spark is very small, so it is more suitable to use infrared sensor. Infrared sensor also has more advantages than ultrasonic in near ground height measurement.
The main camera is integrated on a 2-axis mechanical PTZ, with 12 million pixels, can shoot 1080 / 30fps video, and the video code stream is 24mbps.
The purplish window above the camera is spark's 3D infrared sensing system. Its interior is a set of infrared transmitting and receiving system, and the window color we see is actually the color of the filter.
The 3D infrared sensor senses obstacles by ranging (obtaining depth data). After writing here, you should understand that spark's front obstacle avoidance is not a stereo vision scheme, but a technology called 3D TOF
(TOF is short for time of flight, which means time of flight. The so-called time-of-flight 3D imaging is to continuously send light pulses to the target, then use the sensor to receive the light returned from the object, and obtain the target distance by detecting the flight (round-trip) time of the light pulse.
This technology has also been applied to the lateral obstacle avoidance of spirit 4pro.
Unlike the binocular stereo vision scheme, which often senses obstacles more than ten meters away, Spark's 3D infrared sensor has a small sensing range of only 0.2 to 5 meters.
However, its advantages are also obvious - it can be used in all light conditions. Therefore, when spark flies at night, its front obstacle avoidance function is also effective, and it can recognize gestures!
At the end of spark, you can see the power indicator on the battery.
Open the cover plate at the rear to see the USB interface and memory card slot.
The propeller is a foldable quick release propeller, which is similar to the propeller of mavic pro.
Back of propeller
Back of boom
The lampshade with novel structure has the function of heat dissipation
The electronic governor is very small in size and it also has an integrated LED indicator
Remove the fixing seat of electric regulator
Electric adjustable back
Tear off the insulating film on the back of the electric regulator
Remove the 6 screws mentioned above to remove the top cover of spark. In addition to being fixed with screws, the top cover also adopts a lock structure, which is difficult to disassemble.
In addition, be sure to remove the memory card before removing the top cover, otherwise the memory card may be damaged.
Here, I want to tell you a good news. Although Spark's fuselage top cover does not support convenient replacement, it can be replaced as long as we move a little.
Spark's hardware integration is very high. In addition to considering rationality, it also considers aesthetics in the design of internal structure, giving people a pleasant feeling. According to the interview with Dajiang engineers earlier in the 5imx evaluation room, the biggest design challenge of spark is to plug so many things into such a small space, taking into account cost, producibility, reliability, heat dissipation, shock absorption, power efficiency, electromagnetic interference and RF performance. When we trace back the R & D process through the physical photos of the finished products today, every detail we can see is full of wisdom and enthusiasm. This is indeed a commendable product.
The GPS module is an independent existence and can be removed. Its back is the motherboard, and the motherboard is covered with electromagnetic shielding.
The right side of this part should be Spark's high frequency communication module. The two feeders are connected to the antenna, and the position side of the antenna is on the side of the fuselage head.
Spark's antenna runs a 2.4G signal and has two antennas, which are located on the left and right sides of the front of the fuselage. The figure above shows the antenna on the left.
Separate the motherboard from the fuselage.
Spark's fuselage adopts one-time molding and injection molding process, that is, it is a complete whole without screw fixation and connection. Due to its light weight, Spark's fuselage structure should have good fall resistance. However, you'd better not try extreme flight, because once the fuselage is damaged, replacement is a time-consuming and laborious project. There is a detailed function description on the picture, which you can understand slowly.
This photo shows Spark's power collection module
It becomes clearer when the cover is removed. Reducing the use of wires can reduce the weight, and engineers do their best to reduce the weight of spark.
A typical example: there are 4 groups of cables connected to 4 arms, with only 3 wires in each group. According to the traditional method, each group here will have 5 lines or 4 lines - electrically positive, electrically negative, data line positive (this line can not be used), data line negative and data line.
According to the author's immature analysis, the ground wire of the data line and the negative pole of the power supply may use the same line. There are two kinds of data in the data line, one is the electric regulation control data, and the other is the LED indicator control data.
Spark's PTZ camera uses 3 shock absorbing balls; Spark's IMU is an independent module, which is placed in the fuselage at the rear of the PTZ and suspended by four damping balls. This design can ensure that the IMU is free from electromagnetic interference, and has an independent damping device to make its work more stable and reliable.
Front view TOF module (depth camera), which can be taken out from the fuselage. In addition to collecting depth data, it can also collect gesture visual information in three-dimensional space. The receiver on the left is actually a special camera. The emitter on the right emits invisible light.
Front of motherboard (GPS module removed). The layout logic is clear: the heat dissipation fin is located in the middle of the main board. Its shape and direction are symmetrical and aesthetic. It has a customized design according to the heating weight of the circuit unit, which can be described as extremely ingenious. The main heating unit is located below the main body of the heat sink. The guide groove brings the air flow generated by the fan out of the heat dissipation holes on both sides of the top cover of the fuselage. The secondary heating unit also obtains effective heat exchange due to the overall extension of the heat sink and the intervention of the fan.
The integrated radiator is customized according to the different heating degree of the circuit and the different position and height of the heating parts.
When the fan and radiator are removed, it can be seen that the hot spots are thermally conductive silicone grease (blue substance). In addition, in order to obtain good electromagnetic shielding effect, all parts on the circuit board are treated by electromagnetic shielding cover according to unit function.
When the electromagnetic shield is lifted, is there a visual sense of the mobile phone circuit?
The back of the motherboard is also covered with a large electromagnetic shield.
When the electromagnetic shield is uncovered, it can be seen that this side is mostly composed of resistance, capacitance, inductance and other parts, which are shielded to ensure safety.
Finally, answer a few questions:
1. What image transmission does spark use?
A: Wi Fi image transmission, it is still possible to control short-range flight with mobile phone; To fly far, you have to use spark special remote control; But then again, Spark's positioning is to take a close-up selfie. You fly so far and do the work of mavic pro. The image quality is not as good as mavic pro. It's better to buy mavic Pro directly. It's still a 3-axis 4K PTZ camera, and the blank time is still long.
2. How does it work where the light is weak?
A: the advantage of TOF camera is that it is not affected by ambient light. It can avoid obstacles and recognize gestures at night, but you should remember that it cannot locate without GPS and insufficient ambient light (the low light of the down looking optical flow positioning system does not work), so it can't fly back to your hand in this case. So there is no problem using it outdoors at night. If you use it indoors, you should find a place where the ambient light is not weak.
3. Buy an all-round suit or a single machine?
A: the price difference is 1300 yuan. You need to consider it carefully. If it is used as a self photographing UAV, the power distribution 3 of a single machine is appropriate. If you want to use it in aerial photography, you should use the all-round suit in one step.
4. Can the top cover be replaced?
A: Yes, you need to have some hands-on ability. Another very important thing is that Dajiang can supply this accessory.
5. How about the picture quality?
A: for video recording, just pay attention to the code stream. The code stream of spark is 24mbps, and how much is mavic pro? How much is inspire 2? I don't even have to compare the real picture quality for you. When you talk about the code stream, you will determine the world!
6. What about spark?
A: look what you want to do with it. If you want commercial aerial photography, you should honestly start at least P4P, and you will have mavic Pro no matter how bad it is. Want to play, or send friends, leaders and children. It is used as a self photographing UAV, and is mostly used for social software sharing. Spark is a real cost-effective model you can buy at present. It is covered with black technology, and every publicity function is real! Unlike many ppt UAVs, they blow well, can't fly out and are expensive.
7. Can you be a crossing machine?
A: spark is not a crossing machine in the strict sense, although it may be the most fall resistant and smallest of all products in Dajiang. Spark's positioning is personal selfie and rapid sharing of social software. However, if you have to use it as a crossing machine, who can stop you“
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