1.1 Project Summary
Remote control toys are a popular toy, but it is obviously not realistic for a child who has just learned to walk to operate a complicated remote control. Therefore, it is proposed to design a toy airplane that can automatically follow the child's exercise state. The toy uses a micro-inertial accelerometer and a gyroscope as a child motion information acquisition sensor to measure the child's motion state, and transmits the information to the wireless receiver module of the remote control aircraft through wireless transmission, and the central processing unit of the aircraft determines the movement of the child. State, control the aircraft to follow the child's movement. This achieves the aircraft's follow-up to the child, and has a signal to the parents, so that the parents can know the location of the child, and the temperature, is a new way for parents to care for the child, communicate with the child, truly play the guardian character of. In addition, there is entertainment function, the remote control aircraft can also make a variety of cute sounds to make children happy during the follow-up process. In addition, the toy can also work in a remote control mode, and the toy is remotely controlled by an older child, increasing the fun and safety of the toy.
1.2 Project Background
(1) Market size
With the development of China's economy, the expenditure on toys will increase in the consumption expenditure of urban and rural residents in China. There are about 360 million children under the age of 16 in China, accounting for about 20% of the population. At present, China's children's consumption has accounted for about 30% of total household expenditure, and the total monthly consumption of children aged 0-12 in the country exceeds 3.5 billion yuan. However, the average annual consumption of toys for children and adolescents under the age of 14 in China is only 20-30 yuan (2.4-3.6 US dollars), which is far lower than the level of US children's annual toy consumption of 13 US dollars and the annual per capita annual toy consumption of 34 US dollars. . If China's toy consumption reaches the Asian average, the market size is expected to exceed 30 billion yuan. The mainland toy market will grow at a rate of 40% per year in the future, and sales will exceed 100 billion yuan by 2010.
(2) Development trend
In the 21st century, various high-tech toys that integrate sound, light and electricity functions have begun to seize the status of traditional toys. The United States, the world's number one toy consumer, has been particularly typical in this regard. In recent years, more and more smart toys have emerged in the Chinese market, such as Zhiduo Xiong. It has successfully integrated a variety of products, and through artificial intelligence technology, children are obtained in the interaction with Zhiduo Xiong. Happy, improve IQ.
(3) Social conditions
Due to the implementation of the family planning policy and the growing pressure of life, more families choose only one child, and their parents spend less and less time with their children, but their parents' care for their children has not diminished. More and more parents are willing to buy toys to alleviate their loneliness. At the same time, the toy itself has the comprehensive ability to regulate the body's intelligence, physical strength and emotions, and is also beneficial to the child's physical and mental health.
Our goal is to design a toy that combines entertainment and surveillance. It can reduce the child's loneliness, and let parents know the child's environment and prevent unknown accidents.
Second, the demand analysis2.1 Functional requirements
1. The toy airplane can obtain the walking or moving path of the child, so as to achieve real-time follow-up within a certain distance, and bring fun to the child;
2. Perceive the child's environment (such as temperature, air pressure) and pass the information to the parents in time;
3. Two modes: switching function with “follow†mode and “manual†mode. In “following†mode, the toy airplane follows the movement of the child, and in the “manual†mode, the movement of the toy airplane is controlled by the remote controller;
4. Battery detection and self-protection: When the battery is low, the toy aircraft will automatically land safely to the bottom.
5. Transfer the child's geographical location, environment, and temperature pressure to the parents: Parents can set the range of children's play through the remote control. In the "follow" mode, when the toy airplane is beyond the set threshold from the remote control Will remind parents: Children are too far away from themselves, as shown in Figure 1.
Figure 1 Parental monitoring schematic
6. During the flight of the toy airplane, music such as children's songs can be played randomly;
Figure 2 Guardian Angel Finished Product Design
2.2 Performance standards
1. Toy airplanes and children can achieve stable and reliable wireless communication within 20~30 meters;
2. The delay time of the "follow-up" response is controlled within 5 seconds;
3. The flying height of the toy aircraft in the "follow-up" mode is 1.5~2 meters;
4. The system can work stably at an ambient temperature of -20 ° C ~ 40 ° C;
5. Endurance is more than 1 hour.
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