With the development of society, parents are paying more and more attention to the growth and development of their children in infants and young children. They need to invest more time and energy in caring for babies. Under the pressure of fast-paced life and work in modern society, they often feel powerless. There are too many unforeseen factors in real life that affect the healthy growth of infants and young children. The child's body shape is at the development stage, and 70% of the time is spent in bed. In order to reduce the burden on parents during childcare and improve the quality of child-rearing, the functions of the common crib are simple, the performance is simple, and the functions of intelligent detection and control are hardly available. Therefore, the design of a new type of mobile crib, suitable for indoor and outdoor play, with real-time intelligent monitoring and detection of dangerous systems, can provide parents with information on the baby's living environment and activities at any time.
1 system functional architecture
The baby real-time monitoring system mainly realizes four functions, namely data acquisition analysis and control of various sensors, transmission of wireless network, reception and monitoring of terminals, and anti-drop and anti-collision. The realization of wireless network transmission is the key of this system. . Figure 1 shows the overall structure of the baby real-time monitoring system, using the latest socket library to improve the stability and reliability of system data transmission. The Internet of Things is an important part of the new generation of information technology, and is applied and developed in the smart home system , industry, agriculture and other industries. The basic architecture of the Internet of Things includes three aspects: the perception layer, the network layer, and the application layer. The network controller W5500, WiFi wireless router and nRF24L01 wireless technology using hardware TCPIP protocol are used as the network layer communication of the system to realize the collection and transmission of each sensor data, which has the advantages of strong stability, wide transmission range and low power consumption.
2 system modular design
2.1 data acquisition module
2.1.1 Temperature and Humidity Acquisition Circuit
The design of this circuit is mainly based on the temperature sensor and humidity sensor responsible for the monitoring of the baby's real-time body temperature and whether the bedwetting is monitored. Figure 2 shows the temperature and humidity acquisition circuit. The body temperature data is a high-precision DS18B20 temperature sensor that is commonly used for temperature control, industrial systems, or thermal sensing systems for digital transmission. The DS18B20 temperature sensor contains a two-byte temperature register. The two registers can store the output data. A weak pull-up resistor is connected to the control line. By programming the registers TH and TL, the memory is improved. The accuracy and resolution of the measurement can realize the conversion of temperature values ​​up to 9 to 12 bits in 93.75ms and 750ms.
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