From Libya, the use of drones for military reconnaissance was discovered after the sale of Taobao; the drones to Amazon were consigned, the drones peeked at the opponents during the World Cup; and the drones such as Airdog/hexo, Parrot Ar.drone The emergence of toys. There are indications that thanks to the efforts of geeks, the boom of multi-rotor drones has arrived.
However, this is not enough. The goal of geeks is to bring drones into life and make the drone privatization possible.
Multirotor is an aircraft with more than two rotors. The motor is rotated by the end of each shaft to drive the rotor to generate upward power. By varying the relative speed between the different rotors, the torque of the propulsive force can be varied to control the trajectory of the aircraft.
The shape of a multi-rotor aircraft is much smaller than that of an airplane, usually within two meters in diameter and a minimum of 5 cm. The most common of our four-rotor aircrafts, the square layout is very scientific and technological; in fact, in addition to the four-rotor, there are double-rotor, three-rotor, six-rotor, eight-rotor, twelve-rotor, sixteen Rotor (see e-volo manned multi-rotor). Different number of rotors, different sizes, but their advantages are the same: multi-rotor aircraft is more compact and more stable than traditional helicopters, and the flight is more stable; multi-rotor can take off and land vertically (VTOL) compared with fixed-wing aircraft ), you can also steadily hover at a certain point to perform tasks.
In fact, in 1907, the Breguet brothers Louis and Jacque built the first rotary-wing aircraft under the direction of Professor Richet. According to current standards, it is a four-rotor double-rotor aircraft. However, because the control is too difficult, it is difficult to have practical use. In recent years, with the development of new materials technology and the rapid development of MEMS, it has become very easy to automatically detect the attitude and accurately control the motor speed. With the solution of the control problem, the multi-rotor aircraft once again appeared on the historical stage. A few years ago, we had never heard of a strange plane with four propellers; but now on the battlefield, in the studio, They can even be seen in the pizza shop.
Thanks to the development of microelectronics technology and new materials, DIY a multi-rotor aircraft does not appear to be very difficult. Because the multi-rotor aircraft has a simple mechanical structure, uncomplicated circuits, and low material requirements, any one who has basic circuit knowledge can start DIY a own aircraft; if there is more exploration Spirit, we can even make this aircraft with a series of functions such as GPS navigation, obstacle avoidance, image communication.
I personally studied multi-rotor aircraft from the third year of high school, from the kit to the independent design, produced no less than 20 multi-rotor. Geeks can't be called, but I am a real multi-rotor enthusiast. Next, I will share some basic multi-rotor knowledge and production experience.
How does a multi-rotor aircraft work?
Multi-rotor aircraft have different shapes, but they are generally like this: the flight control is in the middle and multiple arms extend outward. The flight control controls the motor at the outer end of the arm through several electronic governors. When you make an action by remote control, the flight controller acquires information from the receiver and assigns different speeds to each motor to make an action. At the same time, the flight controller also obtains information from the gyroscope and accelerometer, and distributes the motor speed to ensure the stability of the entire aircraft.
The commonly used remote controls, which operate at 2.4G, have the same frequency as wireless networks; but don't worry about interference, as most remotes can avoid interference by frequency hopping.
Multi-rotor aircraft use battery to fly. The battery it uses is the same as a mobile phone or laptop. It is a lithium battery. But the difference is that the multi-rotor aircraft uses a very large rate lithium battery - it has a very large discharge current, even up to 200A.
Multi-rotor aircraft usually use a RC brushless motor, which requires a special electronic governor to drive, but it is worthwhile: it has a small weight, but the power is very large - a motor as large as an egg The power can even exceed one kilowatt.
The flight control board looks very high-end, but it is not. I believe many people know the Arduino programming language, which was developed by Italian engineers in 2005. Most of the current flight controls are arduino programming. For example, the famous APM flight control uses the mega2560 as the main control chip, and an external magnetometer, barometer and other sensors to form a drone flight control system .
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