It is also a long period of time, from the original small white into the present newbie, at least the basic parameters and functional gameplay of the four-axis aircraft, and because of the professional characteristics, I also witnessed four-axis aircraft. From 2012, the whole process of explosing in 2015, and a substantially understanding of the depth of water depth of the aerial industry.
It is said that the original idea of "aerial photography" comes from the two words "departure". In the crowded city, people can quickly discover the numbness and anxiety on the face, whenever I see this I was very afraid of my heart, I may also be one of this. In order to "escape" this state, in order to find my own living method, I choose to start, come to see this world.
So, how do you find your own way? Then I thought about the hot DJI aircraft, but up to 7000 prices, I can't accept it, I have to find another way, that is, DIY, but I feel like I come over, I actually make it from zero, DIY four The axis is not cheap than the commodity aircraft. The main reason is because I have gone a lot of money, I want to share my experience to everyone, and deal with friends who are about to enter or wait and see drone DIY, indicate "some" roads.
Of course, if we started, we should still understand the structure of the four-axis (here we only talk about four spins, other columns such as eight axes, six axes are also similar)
(Forgive my painting style)
The four-week aircraft is also known as a quadrevers, because there are four propelles, each of the two, where the center main control board receives the remote control signal from the remote transmitter, and the control bus passes through the digital control bus after receiving the operation. Control four electrical tones, the electrical tone is converted to the speed of the motor into the motor, and the operator's control needs.
As shown above, we can see that the motor 1 and 2 rotate clockwise, the motor 3, 4 is counterclockwise, so that the gyro effect and air torque effect will be offset when the aircraft balances flight. Of course, this is still to be used in conjunction with the positive anti-propeller.
The four-axis aircraft is one of the six activity freedoms (along the three coordinate axes. If the hair is translated, it will become a stunt flight, commonly known as 180 degrees rolled), but only four control freedoms The system of the four motors, is therefore known as the underwater system (only when the degree of control freedom is equal to the activity freedom), but for the attitude control itself (three coordinate axes) Making a rotating movement) he is completely driven.
Compared with the helicopter, because of the simple structure, the flight posture is relatively small, can not be a super high difficult action, but it also benefits from the structure, so the four-axis aircraft is very simple in maintenance, (think about the helicopter The fryer is scrapped, and it is still quite gratified).
In order to ensure the stable flight of the four-axis aircraft, the four-axis aircraft must be equipped with a gyroscope and a three-axis acceleration sensor in the four-axis aircraft, which can calculate the aircraft at this time and acceleration, angular velocity, and final flight controller. (Flight Control) Calculate the rotational force and lift required to maintain the motion state by algorithm, by electrical tuning to ensure the motor output, and finally fly.
Sth, why should I use a special digital control bus? The first is because the brushless motor cancels the carbon brush structure, so it is necessary to change the positive reaction. Second, because the four-axis may encounter various problems in the air, it is necessary to adjust the gesture of the adjustment itself, in order to meet this corresponding speed. We need special electrical tones instead of different commercial electronics, then use the I2C bus electrical connection, this follow-up circuit design and software portable related I2C bus can be directly connected to the bus on the hardware connection. He has the corresponding transmission mechanism to ensure that the host is smooth, so that the connection is more convenient, so the four electrical tones are connected to the motherboard in parallel, this is also what chip related to us, Many single chip microcomputers have integrated I2C bus, and software is designed to be handed.
I have seen the above article that there is a probably principle for the four-axis structure, if there is any problem or suggestion opinion, you can leave a message below, because next I have planned more about four-axis experience article, I hope everyone support Participation. Write this today, thank you.
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