Basic articles 1. What is a drone? UAV is the abbreviation of Unmanned Aerial Vehicle. It is an unmanned aircraft using radio remote control equipment and its own program control device, including unmanned helicopters, fixed-wing aircraft, multi-rotor aircraft, and unmanned airships. , Unmanned paraglider. In a broad sense, it also includes near-space vehicles (20-100 km airspace), such as stratospheric airships, high-altitude balloons, solar drones, and so on. From a certain perspective, drones can perform complex aerial flight tasks and various load tasks under unmanned conditions, and can be regarded as "air robots". 2. What is flight control? The so-called drone flight control is the drone's flight control system, which mainly includes gyroscope (flying attitude perception), accelerometer, geomagnetic induction flight control, air pressure sensor (rough control of hover height), ultrasonic sensor (low altitude) Precise control or obstacle avoidance), optical flow sensor (precision determination of horizontal position when hovering), GPS module (rough positioning of horizontal position and height), and control circuit. The main function is to automatically maintain the normal flight attitude of the aircraft. Remote control articles 1. Remote control and receiver? An airplane aircraft needs to be controlled by a device. This device is a remote control. The corresponding aircraft needs a device that can receive commands from the remote control. This device is a receiver. The remote controller and the receiver communicate via radio waves. The commonly used radio frequencies are 72Mhz and 2.4Ghz (in the early days, 72MHZ long wave was mainly used, and now technology advances mainly use 2.4GHZ short wave). The remote controller can set some flight parameters, such as the forward and reverse of the throttle, the sensitivity of the joystick, the neutral position adjustment of the steering gear, the function definition of the channel, the recording and reminder of the aircraft time, the setting of the liver function, and the advanced model Battery voltage and current data returned and so on. 2. Crystal and frequency? When using a 72MHz remote control, due to the openness of radio waves, from 72.010MHz to 72.99MHz in the 72Mhz band, a channel is allocated every 20kHz, a total of 50 channels, so that there is one each for the remote control and the receiver A frequency generator (crystal oscillator) with the same frequency allows the receiver and the remote control to communicate at the same frequency. With the advancement of technology, the 2.4Ghz remote control no longer needs to be paired with a single crystal. It only needs to directly perform frequency calibration between the remote control and the receiver, so that the remote control and the receiver can directly establish a communication connection. For home use remote control toys, due to requirements and price reasons, 40MHZ and 27Mhz are mainly used. Sometimes the remote control with the same frequency can be universally operated with each other. This problem also exists on the aircraft model. Therefore, when the 72Mhz remote control was used early, When you arrive at the flying field, everyone will first understand each other's remote control frequency bands to avoid miscommunication operations. 2.4Ghz, now commonly used, is not needed. 3. Definition and requirements of remote control channel? The remote control will have several channels to control, commonly known as several channels. For example, the common SkyFly 6 is six channels. An airplane aircraft, some of which need to be manually controlled by remote control. For example, power control, commonly known as throttle, elevator, rudder, aileron, flaps, landing gear, smoke puller, lights, etc., each item needs a separate channel to control, but some items need to be very precise and non- Level operations, such as throttle, lift, direction, aileron, and some item controls are fixed to several gear operations, such as flaps, landing gear, lights, etc. For the above remote control, there are rocker and joystick definitions, such as throttle, Lift, direction, ailerons are operated with joysticks, and flaps, landing gear, lights, etc. are operated with joysticks.