CN105549648A - Vacuum bottle control device based on STM32 - Google Patents

Abstract

The invention discloses a thermos bottle control device based on STM32, which includes a relay arranged on the thermos bottle for controlling the on-off of the thermos bottle control switch. The temperature collector on the bottle is connected to the input terminal of the main control chip, and the liquid crystal display screen with fonts is interconnected with the main control chip. The present invention can collect the temperature in the bottle in real time and display it through the LCD12864 liquid crystal display screen. Users can press the key The temperature in the bottle can be set within the allowable range, the operation is simple and convenient, and the cost performance is high. This system can bring great convenience to people. It gets rid of the disadvantages of the traditional method of completely relying on the manufacturing process of the thermos bottle to achieve heat preservation, and solves the trouble of unknown water temperature in the bottle. If the design is good, it will have great market and economic benefits.

Description

Thermos bottle control device based on STM32

technical field

The invention relates to automatic control technology, in particular to a thermos bottle control device based on STM32.

Background technique

With the improvement of modern living standards, people's requirements for life are getting higher and higher, and many traditional equipment are constantly updated with the pace of the times. Thermos bottle, also known as electric kettle, is a necessity in people's daily life. It can be said that every home will be equipped with it. Present thermos bottle all is the double-walled bottle of vacuumizing in the interior as inner bag, adds the container that shell forms heat preservation with this, and people are packed boiling water in thermos bottle, so that drink when needed. However, due to the material and manufacturing reasons of the traditional vacuum flask, the thermal insulation effect is good or bad, and the temperature in the bottle cannot be known after the boiling water is placed for a period of time. It brings inconvenience to people's drinking, and many people will directly pour out the cooled boiling water, which is a great waste of water resources.

Contents of the invention

The technical problem to be solved by the present invention is to provide a thermos bottle control device with simple structure and stable operation to overcome the deficiencies of the prior art.

The present invention is achieved like this:

A thermos bottle control device based on STM32, including a relay arranged on the thermos bottle to control the on-off of the thermos bottle control switch, an output terminal of the main control chip is connected to the relay and controls the opening and closing of the relay, and the temperature set on the thermos bottle The collector is connected to the input end of the main control chip, and the liquid crystal display screen with font library is connected to the main control chip.

In the aforementioned thermos bottle control device based on STM32, the liquid crystal display with character library adopts LCD12864 model, 12864 liquid crystal 5V voltage drive, with backlight, built-in 16X16 dot matrix, 128 characters and 64X256 dot matrix display RAM , The microcontroller interface is controlled in a parallel or serial manner. The 128X64 with Chinese font library is a display module that contains national standard first-level and second-level simplified Chinese font libraries, and there are 8192 Chinese characters in it.

In the aforementioned STM32-based vacuum flask control device, the main control chip uses STM32F103ZET6 as the main control chip.

In the aforementioned STM32-based vacuum flask control device, the temperature collector uses a DS18B20 module.

Due to the adoption of the above technical solution, compared with the prior art, the present invention can collect the temperature in the bottle in real time and display it on the LCD12864 liquid crystal display screen, and the user can set the temperature in the bottle within the allowable range through the buttons. The operation is simple and convenient, and the cost performance is very high. This system can bring great convenience to people. It gets rid of the disadvantages of the traditional method of completely relying on the manufacturing process of the thermos bottle to achieve heat preservation, and solves the trouble of unknown water temperature in the bottle. If the design is good, it will have great market and economic benefits.

Description of drawings

Accompanying drawing 1 is a structural frame diagram of the present invention;

Accompanying drawing 2 is LCD12864 hardware circuit diagram among the present invention;

Accompanying drawing 3 is the interface schematic diagram of JLINK and serial port among the present invention;

Accompanying drawing 4 is the schematic diagram of power button and LED in the present invention;

Accompanying drawing 5 is relay hardware circuit diagram among the present invention;

Accompanying drawing 6 is the pin figure of main control chip among the present invention;

Accompanying drawing 7 is the overall flowchart of the present invention;

Accompanying drawing 8 is the work flowchart of LCD12864 among the present invention;

Accompanying drawing 9 is the control flowchart of relay among the present invention;

Accompanying drawing 10 is the flow chart of temperature collection in the present invention.

detailed description

Embodiment of the present invention: a thermos bottle control device based on STM32, as shown in Figure 1, includes a relay 1 arranged on the thermos bottle for controlling the on-off of the thermos bottle control switch, and the main control chip 2 is connected to the output terminal The relay 1 controls the opening and closing of the relay, the temperature collector 3 arranged on the thermos bottle is connected to the input terminal of the main control chip 2, and the liquid crystal display screen 4 with a character library is interconnected with the main control chip 2.

Among them, the liquid crystal display 4 with font library adopts LCD12864 model, 12864 liquid crystal 5V voltage drive, with backlight, built-in 16X16 dot matrix, 128 characters and 64X256 dot matrix display RAM, single-chip interface adopts parallel or serial mode to control . The 128X64 with Chinese character library is a display module that contains national standard first-level and second-level simplified Chinese character libraries. There are 8192 Chinese characters inside. The main control chip 2 uses STM32F103ZET6 as the main control chip, and the temperature collector 3 uses a DS18B20 module.

The principle of this embodiment is: use STM32 as the main control chip, collect the temperature information through the sensor of DS18B20, send it to STM32 for processing, and then display the corresponding display on the display module 12864, and the user can easily know the water temperature in the bottle , and the temperature can be set through the buttons, and the relay closes the heating switch to increase the temperature of the water in the bottle to maintain the temperature in the bottle; the hardware platform of the system is based on the STM32 series processor STM32F103ZET6, and the temperature collector DS18B20 Module, LCD12864 liquid crystal display module with font library and relay module. The STM32 system can communicate with the host computer through the serial port, and can also modify the program through the JLINK downloader, which constitutes the design of the vacuum flask system based on STM32.

specific hardware design

1. LCD12864 LCD display hardware design with font library

12864 liquid crystal 5V voltage drive, with backlight, built-in 16X16 dot matrix, 128 characters and 64X256 dot matrix display RAM, single chip interface is controlled by parallel or serial. The 128X64 with Chinese font library is a display module that contains national standard first-level and second-level simplified Chinese font libraries, and there are 8192 Chinese characters in it. The module interface is simple and easy to use. It can display both Chinese characters and pictures, and the display interface for temperature control is completely sufficient.

1. Working principle of LCD12864

It can be seen from Table 1 that the third pin needs to be used to adjust the brightness of the screen. Pins 7 to 14 are used for data transmission, and pin 15 is for serial and parallel selection, and the parallel execution efficiency is higher. This design is also the selected parallel mode, which can set PSB high under software control, or directly set 15-pin VCC by hardware. When programming, the I/O of the three control ports RS, R/W, and E will be used. The specific implementation will be introduced in the software.

2. LCD12864 instruction table

The 12864 is rich in functions, as shown in Table 2. When writing a program, it is necessary to control the 12864 according to the instructions. The table introduces the basic instruction set of 12864, and the extended instruction set is basically not used in this design.

3. LCD12864 hardware circuit

Connect the data port of 12864 directly to the PA port of STM32, use the parallel data transmission mode to control the display, and display the current temperature in real time. as shown in picture 2.

2. Download and serial communication module

In this embodiment, JLINKV8 can also be used for program download and online simulation, and the serial port of DB9 is used for communication between the single-chip microcomputer and the PC. A 20-pin standard JTAG debugging interface is adopted, which can be directly connected to emulators such as JLINK and ULINK. The schematic diagram of the interface is shown in Figure 3.

3. Power button and LED module

The system provides two keys for human-computer interaction through key input; three LED indicators can be used to display the running status of the program, which is convenient for programmers to debug. One end of the LED light is directly connected to the I/O port of the microcontroller, and the LED can be turned on and off by controlling the level of the I/O port.

The STM32ZET6 single-chip microcomputer is powered by 3.3V, and the external input 5V power supply is provided to the minimum system of the single-chip microcomputer after voltage conversion. Its schematic diagram is shown in Figure 4.

4. Relay blocks

When the coil of the relay is energized by the STM32, the relay will disconnect from the original normally closed state, and then connect with the other pin. By controlling the weak current, the relay can operate according to the required function and reduce the danger of the staff. It is a commonly used method to control the strong current. Since the relay usually controls a large current, for safety reasons, a reverse diode is generally connected next to the relay coil to protect the circuit. The hardware connection method of the relay is shown in Figure 5.

5. DS18B20 module

The core function of this module is a temperature collector that directly reads numbers. 9, 10, 11, and 12 bits can be programmed according to the accuracy requirements, with increments of 0.5°C, 0.25°C, 0.125°C, and 0.0625°C respectively. The power-on default is 12 bits, and this design also adopts the default value, which is the precision of 0.0625. The module has only 3 pins, which are power supply, ground, and data input/output pins. The hardware only needs one IO port for connection control, which is very convenient and accurate.

6. Main control chip

This system chooses STM32F103ZET6 as the main control chip. The STM32F103 series microprocessor is the first 32-bit standard RISC (Reduced Instruction Set) processor based on the ARMCortex-M3 architecture, which provides high code efficiency. Usually 8-bit and 16-bit The storage space of the system utilizes the high performance of the ARM core. The operating frequency of this series of microprocessors is 72MHz, built-in up to 128K bytes of Flash memory and 20K bytes of SRAM, and has abundant general-purpose I/O ports. It contains rich communication interfaces: three USART asynchronous serial communication interfaces, two I2C interfaces, two SPI interfaces, one CAN interface and one USB interface, which provide a guarantee for the realization of data communication. The pin diagram of the STM32F103ZET6 chip is shown in Figure 6.

In order to better display the connection relationship and application of the devices in this embodiment, a set of software matching the devices in this embodiment is used to describe in detail.

Figure 7 is the overall flow chart, which mainly controls the operation of various peripherals through the STM32 of the Cortex-M3 architecture. STM32 is implemented with a minimum system, and the key function and liquid crystal display function are cyclically scanned in the main function. The button scanning function mainly realizes the setting of the upper and lower limits of the temperature through the control of 2 buttons, and sets the temperature to be reached. Then display the information on the screen with the liquid crystal display function. STM32 realizes the closure of the peripheral heating circuit by controlling the on-off of the relay to keep the temperature around the set temperature. Thereby, the temperature in the vacuum flask can be controlled and displayed in real time.

Among them, the LCD12864 function module mainly displays the temperature of the vacuum flask in real time, and vividly displays the temperature threshold, set value, and current temperature at the corresponding positions. The subroutine voidLCD_Write_Cmd(ucharcommand) of this module is the function of LCD write command, which is completed according to the timing diagram of write command. The hardware connects the PA port with the data port of the 12864, and the software passes the command to be written to the PA port through the command parameter to realize the basic operations on the 12864, such as clearing the screen, shifting and other commands need to call this function. voidLCD_Write_Dat(uchardat) This is the function for LCD to write data. This function is called when Chinese characters and pictures are to be displayed on the screen. Because when displaying on the display, you need to specify the address first, and then write data at this address. The address writing function voidLCD_Position(ucharX,ucharY), the function of this function is to move the cursor to the position of row X and column Y, and then call the function of writing data, and then write the data to be displayed at the initial address of X and Y sequentially. With these basic functions, some simple Chinese characters and graphics can be displayed on the 12864. The flow chart of this part of the software is shown in Figure 8.

The design of the button and relay control function mainly realizes the human-computer interaction, through the button to set the desired temperature in the bottle, and display it on the LCD at the same time. If the temperature in the bottle is lower than the expected temperature, the main control chip will control the relay to close, and the peripheral heating circuit will close to realize the heating function. Thereby, the temperature inside the bottle is ensured, and at the same time, the temperature inside the bottle is displayed, which is very convenient for users to use and solves the disadvantages of traditional thermos bottles. The program flow of this part is shown in Figure 9.

The DS18B20 temperature acquisition module mainly realizes the acquisition of temperature, and outputs data through the data port of DS18B20. The program flow of this part is shown in Figure 10.

This embodiment, as a new design idea, breaks the limitation of completely relying on the manufacturing process for heat preservation, and embeds the technology of the new era into daily life. Not only is the design price low, but it is also practical for every family and has a very broad market. It can be realized only by changing the traditional design method at the time of manufacture.

Through the application of the cost-effective STM32, using the commonly used thermos bottle as the application object, the thermos bottle based on the STM32F103 series is designed, the hardware principle design of each module is completed, and the overall software planning of the system is carried out according to the actual needs. Then design the software of each sub-module. At the same time, this design also has a serial port to communicate with the upper computer PC, and can also modify and expand the program as needed, and download the program through the JLINK port. The temperature in the vacuum flask is collected, displayed on the LCD12864 display screen, and the relay controls the heating circuit. It has basically achieved the expected goal and has great practicability.

The description of the above solution is an invention for those of ordinary skill in the technical field to understand and use. Various modifications to the embodiments will be apparent to those skilled in the art. Therefore, the present invention is not limited to the above-mentioned practical solution, and improvements and modifications made by those skilled in the art according to the method of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims (4)

1. the thermos control device based on STM32, comprise and being arranged on thermos for controlling the relay (1) of thermos gauge tap break-make, it is characterized in that: main control chip (2) output terminal connects relay (1) and the opening and closing of pilot relay, the Temperature sampler (3) be arranged on thermos is connected with the input end of main control chip (2), and the LCDs (4) of band character library realizes interconnected with main control chip (2).

2. a kind of thermos control device based on STM32 according to claim 1, it is characterized in that: the LCDs (4) of described band character library adopts LCD12864 model, 12864 liquid crystal 5V voltage driven, band backlight, the built-in dot matrix of 16X16,128 characters and 64X256 lattice display RAM, interface microcontroller adopts mode that is parallel or serial to control, 128X64 with Chinese word library is the display module that GB one-level, secondary simplified form of Chinese Character character library are contained in a kind of inside, and there are 8192 Chinese characters the inside.

3. a kind of thermos control device based on STM32 according to claim 1, is characterized in that: described main control chip (2) adopts STM32F103ZET6 as main control chip.

4. a kind of thermos control device based on STM32 according to claim 1, is characterized in that: described Temperature sampler (3) adopts DS18B20 module.