The Brazilian World Cup is in full swing, and all national teams are tightening training in order to achieve good results, but in such a nervous atmosphere, there is a thing that is awkward in the French team. A fan was caught by a unmanned aircraft flying to the French team training ground. This matter was reported by major media and also equipped with a speculated aircraft photo. Such aircraft is called a four-rotor helicopter whose typical is characterized by four of the four vertices of the cross-shaped fixed shaft, which can hover, roll, yaw, and upper and lower moves like a dragonfly. Wait actions.
For a traditional remote control helicopter, the four-rotor helicopter has several advantages:
First, the four-rotor helicopter does not require a mechanical linkage to change the inclination angle at the time of rotation of the propeller, which simplifies the maintenance of design and helicopters.
Second, four motors can make each propeller diameter smaller than a single propeller (excluding tail paddle) of the traditional remote helicopter, thereby reducing the kinetic energy generated during flight. This can reduce damage when helicopter hits other objects. For small remote aircraft, smaller propeller diameters means that closely fly more secure. Some small four-rotor helicopters increase the protective cover for propelles to fly in a more complex environment while reducing the risk of damage to the periphery.
The four-rotor helicopter is actually a remote aircraft controlled by an embedded system. Its hardware system includes the fuselage and the remote control. The main components of the fuselage have processors, X-Y axes, Z-axis gyro, X-Y-Z axis accelerometers, radio frequency communication modules, and four motors. The software uses RTOS real-time operating systems such as UC / OS-II. During the flight, the CPU receives a command sent to the flight, and simultaneously reads the gyroscope measurements accelerometer, and emits a signal to adjust the speed of the motor, so that the will of the helicopter flight operator.
In order to make the entire system work normally, the processor must constantly communicate with the peripheral device to collect data and issue instructions. In the square of the four-rotor helicopter, the gyroscope analog signal outputs an analog-to-digital converter connected to the processor, and the RF communication module is connected to the processor via the SPI bus, and the three-axis accelerometer is communicated with the processor through the IIC bus. These communication functions need to be considered during development.
The FRDM-KL05Z (on) and FRDM-KL25Z (below) developing plates launched by British Tech Technology Based on the Kinetis L Series Microcontroller for Freecale. The Kinetis L Series Microcontroller uses the ARM Cortex-M0 + core, with high energy efficiency and high performance, integrated SPI and IIC bus and MMA8451Q three-axis accelerometer and AD converter, which meets the development requirements of four-rotor helicopter. Based on the two development plates of the series microcontroller, the size of the four-rotor helicopter is very sensitive to the overall weight.
In addition, the FRDM-KL05Z and FRDM-KL25Z development boards also provide an expansion interface compatible with Arduino, providing greatest possibilities for more additional functions. At the same time, British Technology has a professional technical team and profound embedded development experience, which provides comprehensive technical support and software resources for designers. With hardware, software, and technical support, FRDM-KL05Z and FRDM-KL25Z development boards are not only applicable to the development of four-rotor helicopters, but also meet small electrical, game accessories, portable medical equipment, audio systems, intelligent meters, lighting and Demand for applications such as power control.
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