Development and design of the milk warmer circuit control board

With the rapid development of my country's economy and society today, the infant feeding standards of the people in our country are continuously improved, which makes the temperature-adjustable milk warmer, a practical small appliance that can effectively improve the infant feeding level, have a high market potential . In the author's investigation, it is found that there are two design ideas of the current mainstream milk warmer in my country, the mechanical thermostat directly connected in series with the heating circuit and the use of the oscillating circuit to delay the time, but for these two design ideas of the milk warmer , it does not have the function of setting the temperature and switching the heating mode, which greatly affects the practicability of the milk warmer. The reason for the study.

1. Deficiencies of traditional milk warmers

In order to better complete the relevant research on the milk warmer in this paper, we first need to clarify the shortcomings of the traditional milk warmer in our country. It is well known that dairy products cannot be reheated, because this will cause the interaction of milk proteins and affect the health of infants and young children. The scientific formula milk powder preparation method shows that the traditional milk warmer will continue to be eliminated by the market.

2. Structural design of temperature-adjustable milk warmer

In order to better complete the design of the temperature-adjustable milk warmer controlled by the single-chip microcomputer in this paper, the author chooses the single-chip microcomputer as the controller of the milk warmer, and completes this design on the basis of the traditional milk warmer. To meet the needs of scientific formula milk powder preparation methods, the author added five modules for this milk warmer, including temperature display, temperature adjustment, sound and light music, heating, rapid cooling, and LCD display. It is worth noting that in the realization of the rapid cooling function, the author chose the design method of rapid cooling through the DC fan.

In the design of this temperature-adjustable milk warmer, we first need to choose the single-chip microcomputer used in this design. Here, the author chooses AT89C5131 of ATMEL Company as the controller designed in this paper. This single-chip microcomputer based on 52 cores can better meet the requirements. Control needs for temperature adjustable bottle warmers. In order to ensure that this temperature-adjustable milk warmer can achieve better temperature control, the author chooses a digital temperature sensor of the DS18B20 model in the selection of temperature-sensing components, and it can be better realized by connecting this sensor to an LCD display. Display of temperature. In the specific connection of the AT89C5131 single-chip microcomputer, it needs to be connected with the music module, LED indicator light, heating chip, fast cooling fan, LCD display and other components, so as to ensure that the function of the temperature-adjustable milk warmer is better realized. , It is worth noting that the connection of this digital temperature sensor needs to use I/O port P1.5, while the heating chip needs to use I/O port P2.5 for connection. In addition, in order to ensure the better use of AT89C5131 single-chip microcomputer, it also needs to be connected with the driving circuit and power supply.

3. Software design of temperature-adjustable milk warmer

(1) Design ideas: In the above we have clarified the structural design of the temperature-adjustable milk bottle, and in order to ensure that the temperature-adjustable milk bottle can really better serve infant milk powder feeding, we also need to carry out a temperature-adjustable milk bottle. The author chooses JAVA as the development language for the software design of the milk warmer. The representative of this static object-oriented programming language can better meet the research needs of this paper, and the software designed by this language can also be well-organized and expandable. Good-looking features.

(2) Function introduction: In the temperature-adjustable milk warmer designed in this paper, it has five functions, including setting the heat preservation temperature range with buttons, three operating modes, one-time heating, convenient operation, and a reminder mode with display lights and children's songs. aspect function. In the function of setting the heat preservation temperature range by pressing the button, the misoperation and false alarm of the temperature-adjustable milk heater can be better avoided; and in the function with three operating modes, this function will better ensure that the temperature can be adjusted. The thermostat meets the needs of scientific formula milk powder preparation methods; for the single heating function, this function can avoid the loss of nutrients and the generation of toxic substances; for the convenient operation function, this function comes from Combined with the better control achieved by the LCD display; and for the reminder mode function with display lights and children's songs, this not only makes the temperature-adjustable bottle warmer more childlike, but also allows children to get the most appropriate temperature and nutrition. Adequate formula feeding.

(3) Brief description of the design: In order to realize the many functions mentioned above, the author uses the programming idea of module subroutine call and interrupt system, and in the realization of the function of mode selection, the author uses interrupt timing to program The design method that a certain frequency is output from port 10, and this design can realize the temperature adjustment of the milk warmer. In the fast cooling mode, we can use this method to realize the adjustment of cooling at different wind speeds. In the realization of the temperature setting function, the design of this function can be better completed by combining the single-chip microcomputer to realize the comparison between the temperature data and the design temperature range.

Summarize

In this paper, the research on the design of temperature-adjustable milk warmer controlled by single-chip microcomputer is carried out. Combining this series of content, we can discover the significance of this design for infant feeding in my country, and hope that relevant professionals can pay more attention to it.

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