When it comes to aerial drones, most people recognize that its dimensions are usually: how good the picture quality is, how stable the video is, how long it can fly, and how high it can fly.
These indicators are not important at all? Of course it is very important.
Its importance is like we talk about a car that is not fuel-efficient, comfortable and comfortable, and the craftsmanship is not fine.
However, the pace of innovation can sometimes be faster than the imagination of the public. As we continue to talk about these traditional topics, history is quietly opening new chapters.
Don't miss the wonderful video at the end of the article!
Not long ago, you may have the impression that after the launch of the Elf 4, which can achieve forward-looking obstacle avoidance and visual follow-up, the topics that players talk about are more than the "smart shooting" function.
The "cloud-top hand" that uses the machine to do it can capture the professional composition and mirror path that can be done in the past by professional cloud hands. The Mavic Pro that follows will not only fold into the size of a mineral water bottle, but the smart shot function is exactly the same as the Elf 4.
When we are still admiring the Mavic Pro's small size and strong function, Spark is smaller than the Mavic Pro. It is only the size of a palm and can take off and land on the palm of your hand.
Not only does it have all the "smart" features of Mavic Pro, it's even smarter than Mavic Pro: it supports gesture control (no phone or remote control).
Of course, Spark has other new features, which are described in detail in the article published earlier in the 5iMX evaluation room. Friends who have not paid attention can go to understand.
Review the 5iMX evaluation room history article: (Please go to the 5iMX portal to watch)
5iMX for you to analyze the Daqing "Xiao" Spark handheld drone with a new experience
Black technology-like existence! Dajiang Spark handheld drone experience
Dajiang Spark domestic debut, 5iMX exclusive secret behind the scenes design process
In this article, I will lead players interested in Spark to start a mysterious exploration journey from the outside to the inside.
I believe that reading this article will enhance your understanding of the so-called "black technology".
Spark's storage box comes standard with a Spark and two extra batteries. With the battery on the Spark body, it can hold up to three batteries.
Spark configuration battery capacity is 1480mAh, voltage 11.4V (belonging to high-voltage battery lithium battery), energy density is 16.89Wh, in line with civil aviation regulations can be carried on the aircraft.
Spark battery design is small and exquisite, designed with touch pad, external charging contacts, power indicator LED lights and fixed locks. After being installed on the Spark body, it can be integrated into the body and has a good overall sense. It is also very easy to remove the battery from the body, pinch the battery lock, and pull it back to remove the battery.
There are a total of 6 screws for fixing Spark, 4 of which are in the battery compartment, and are hidden after the battery is installed. The other two fixing screws are behind the head of the head, and the hiding degree is also very good. If you don't look carefully, you can't see a clearly exposed screw on Spark.
There are 6 output contacts on the battery, and two of them may be used to verify that the battery is genuine.
This photo shows a high-power charger and battery housekeeper. This configuration is only available in the Spark all-in-one package, although it can be purchased separately if needed. If you purchase a Spark stand-alone version, you can only charge the battery through the USB interface (the charging speed will be slower, if the battery is more convenient).
The charger also provides two 2A USB ports.
The output power is 50W, the output voltage is 13.05V, and the current is 3.83A.
Spark battery housekeeper's back logo
The charger connects to the battery housekeeper through this dedicated plug
The whole picture 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. As of now, Dajiang has not announced the use of the contact.
The lower vision system is a combination of a camera and an infrared sensor (one for each shot). The camera is used to obtain the position information of the aircraft (effective within 30 meters of the flight altitude).
The infrared sensor is used to judge the current height (measuring range is 0m to 8m), which is an important function guarantee for Spark to complete the fixed-point flight in indoors (without GPS).
As we all know, to achieve the effect of accurate height, you can also use ultrasonic sensors, which are used in Elf 3 and Elf 4.
Spark is very small, so it is more suitable to use infrared sensors. Infrared sensors are more advantageous than ultrasonic in terms of near-ground height measurement.
The main camera is integrated into a 2-axis mechanical head. It has 12 million pixels and can shoot 1080/30fps video with a video stream of 24Mbps.
The purple-light window above the camera is Spark's 3D infrared sensing system, which has a set of infrared transmitting and receiving systems inside, and the color of the window we see is actually the color of the filter.
The 3D infrared sensor senses obstacles by ranging (getting depth data). Written here, everyone should understand that Spark's front obstacle avoidance is not a stereo vision solution, but a technology called 3D TOF.
(TOF is the abbreviation of TIme of flight, literally translated as flight time. The so-called time-of-flight 3D imaging is to continuously send light pulses to the target, then receive the light returned from the object with the sensor, and fly through the probe light pulse (round-trip ) time to get the target distance).
This technique has also been applied to the lateral obstacle avoidance of the Elf 4Pro.
Unlike the binocular stereo vision solution, which senses obstacles more than a dozen 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 lighting conditions. Therefore, when Spark is flying at night, its front obstacle avoidance function is also effective, and it can recognize gestures!
At the end of the Spark, you can see the battery indicator on the battery.
Open the cover at the rear to see the USB port and memory card slot.
The propeller is a foldable quick release paddle similar to the Mavic Pro propeller.
The back of the propeller
Back of the arm
Novel lampshade with heat dissipation
The electronic governor is very small in size and it also integrates LED indicators.
Remove the ESC mount
Electric adjustment back
Remove the insulating film on the back of the ESC
The top cover of the Spark can be removed by removing the six screws described above. In addition to the screw fixing to the fuselage, the top cover also adopts a locking structure, which is difficult to disassemble.
Also, be sure to remove the memory card before removing the top cover, otherwise the memory card may be damaged.
Written here, the author wants to tell everyone a good news, Spark's fuselage top cover does not support easy replacement, but as long as we slightly move hands, it can be completely replaced.
Spark's hardware integration is very high. In addition to considering the rationality, the design of the internal structure does not lose the aesthetic considerations, giving people a feeling of appreciation. According to interviews with engineers from DJI in the 5iMX evaluation room earlier, Spark's biggest design challenge is to put so many things into such a small space, taking into account both cost, productivity, reliability, heat dissipation, shock absorption, Power efficiency, electromagnetic interference, RF performance. When we go back and forth through the finished product photo today, every detail that can be seen is all devoted to wisdom and enthusiasm. This is indeed a commendable product.
The GPS module is an independent presence that can be removed. Its back is the motherboard, and the motherboard is covered with an electromagnetic shield.
The right side of this section should be Spark's high frequency communication module. Two feeders are connected to the antenna, and the position of the antenna is on the side of the fuselage head.
Spark's antenna runs a 2.4G signal, with two antennas, located on the left and right sides of the front of the fuselage. The picture above shows the antenna on the left.
Separate the motherboard from the body.
Spark's fuselage uses a one-shot molding process, which means that it is a complete whole, without screws and joints. Because of its light weight, Spark's fuselage structure strength should have a good resistance to falling. However, you'd better not try extreme flight, because once the fuselage is damaged, replacing it is a time-consuming and laborious project. There are detailed function descriptions on the picture, you can understand it slowly.
This photo shows Spark's power collection module
It is more clear when you remove the cover. Reducing the use of wires can reduce weight, and engineers are doing their best to save weight for Spark.
A typical example: There are 4 sets of cables connected to 4 arms, each with only 3 wires. According to the traditional method, there will be 5 wires or 4 wires in each group - the ESC is positive, the ESC is negative, the data line is positive (this line can be used), the data line is negative, and the data line is.
According to the author's immature analysis, the ground line of the data line and the negative pole of the power supply may use the same line. The data line runs two kinds of data, one is the ESC control data, and the other is the LED indicator control data.
Spark's PTZ camera uses three shock-absorbing balls; Spark's IMU is a separate module that is placed in the back of the gimbal and suspended by four shock-absorbing balls. This design ensures that the IMU is protected from electromagnetic interference and has independent damping devices to make it more stable and reliable.
Front view TOF module (depth camera), this module 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 transmitter on the right is the invisible light emitted.
The front of the motherboard (the GPS module has been removed). The layout logic is clear: the heat sink fins are located in the middle of the main board, and the shape and orientation of the heat sink are symmetrical, and the design is tailored according to the heat and weight of the circuit unit. Below the main body of the heat sink is a main heat-generating unit. The air-conducting groove brings the airflow generated by the fan out of the heat-dissipating holes on both sides of the top cover of the fuselage, and the secondary heat-generating unit also obtains effective heat due to the overall extension of the heat sink and the intervention of the fan. exchange.
The integrated heat sink is tailored to the degree of heat generation of the circuit and the positional height of the heat-generating parts.
Remove the fan and heat sink, and the hot spots are conductive with thermal grease (blue material). In order to obtain a good electromagnetic shielding effect, all parts on the circuit board are electromagnetically shielded by the electromagnetic shielding cover according to the unit function.
Uncovering the electromagnetic shield, is there a visual sense of the mobile phone circuit?
The back of the motherboard is also covered with a large electromagnetic shield.
Uncover the electromagnetic shielding cover, it can be seen that this surface is mostly resistance, capacitance, inductance and other parts, shielding it to ensure that nothing is lost.
Finally, answer a few questions:
1. What image is used by Spark?
A: Wi-Fi map transmission, it is OK to use mobile phone to control close-range flight; to use Feiyuan remote control to fly far; but then, Spark's positioning is close-range self-timer, you fly so far to do Mavic Pro The live quality is not as good as Mavic Pro. It is better to buy Mavic Pro directly, or a 3-axis 4K PTZ camera.
2. What is the use of weak light?
A: The advantage of the TOF camera is that it is not affected by ambient light. It can also avoid obstacles and recognize gestures at night, but you should remember that if there is no GPS and the ambient light is insufficient (lower vision optical flow positioning system does not work) It can't be located, so it can't fly back to the hand in this case. Therefore, there is no problem in using it outdoors at night, and it is used indoors to find places where ambient light is not weak.
3. Buy an all-around suit or stand-alone?
A: The price difference is 1,300 yuan, you need to think carefully. If the self-timer drone is used, the single machine is equipped with 3 electric power. If you want to use it for aerial photography, you can still use it in one step.
4. Can the top cover be changed?
A: Yes, you need to have some hands-on ability, and one is very important: Dajiang can supply this accessory.
5. How is the picture quality?
A: If you are recording, you should pay attention to the code stream. Spark's code stream is 24Mbps, and what is Mavic Pro? How much is Inspire 2? I don't have to compare the quality of the picture to you, let's talk about the code stream!
6. What about Spark?
A: See what you want to do with it. Want to commercial aerial photography, honestly at least P4P start, and then get Mavic Pro. Want to play, or send friends, send leaders, send children, when used by self-timer drones, and more for social software sharing, Spark is the real price-performance model that you can buy now, it is covered with black technology Every function of propaganda is real! Unlike many PPT drones, it blows well, can't fly, and is expensive.
7. Can you cross the machine?
A: Spark is not strictly a cross-machine, although it may be the most resistant and the smallest of all products in DJI. Spark's positioning is a personal selfie, social software fast sharing. However, you have to use it as a cross-machine, who can stop you?
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