ABSTRACTwith the accident of Asphyxiation and death in the children's car in recent years, the demand for this kind of dangerous alarm devices. The vehicle dangerous alarm device has both temperature and oxygen concentration monitoring and alarm function .As the core of the main measurement and control system of the vehicle dangerous alarm device, STC89C52 is used to collect, process and display the data of the data .The function of alarm and other functions, The temperature monitoring module uses DS18B20 digital temperature sensor, output signal is all digital; The Oxygen concentration monitoring module uses the potentiometer to replace, through the ADC0809 conversion, carry on the LCD digital display. In this paper, design based on single chip microcomputer on-board danger alarm device structure is simple, the design is unique the research has some significance.

In twenty-first Century, people's living demand is higher and higher, the SCM application is more and more widespread, and the residents' equipment is constantly intelligent, in which the baby automatic rocking sleep device is a manifestation. For understanding the modern city infant care needs, combined with the development situation both at home and abroad, this paper puts forward a design of intelligent nursing device for baby, analysis device is feasible in theory, through the analysis of the process of care and infant care personnel needs, will demand into the design language, so as to establish the functional framework of infant nursing device, MCU minimum system as the basis, structures of each module, design a baby care device model, so as to assist the care function, ease the pressure on the role of guardian care of infants. The main purpose of this design is to study the diversification of the baby bed, and design a control unit based on single chip microcomputer. The baby bed takes the smallest system of STC89C51 as the main control unit. The external temperature and humidity detection module, the voice sensor detects the baby's crying, and uses the buzzer to play music.