Microwave oven controller design and development

Since the 1980s, my country has started to produce microwave ovens on a small scale. Up to now, it has considerable production capacity. China will also become a huge microwave oven market. This design mainly provides a programmable microwave oven controller system based on single-chip microcomputer control. It can realize the four basic functions of conventional thawing, cooking, steaming and baking.

1. Microwave oven hardware circuit design

(1) Design ideas: The hardware design uses the microcontroller AT89S52 as the control core, combined with the required peripheral modules, to complete the keyboard data processing, control the magnetron, and the liquid crystal display working status and working time. Immediately after the set time is up Sound and light alarm and other functions. By receiving the input from the keyboard to confirm the user's functional requirements, the data is loaded, and the magnetron starts to work. The working time and power of the magnetron are automatically controlled by the single-chip microcomputer, and the timing task is performed at the same time.

(2) Magnetron circuit design: When the function is selected, the single-chip microcomputer starts to work, the magnetron starts to work, and the selected function is performed on the food, and the liquid crystal display starts to display the working status and working time at the same time. At the end of the working time, the magnetron stops working, and at the same time the liquid crystal display, the buzzer and the sound and light alarm composed of four diodes start to work, so that the control work is completed. In this design, the working power of the magnetron is different under different working conditions. This design realizes four functions: thawing, cooking, steaming, and grilling, and the working power increases in turn.

(3) Display circuit design: Liquid crystal displays are more and more widely used due to their advantages of low power consumption, small size, rich display content, ultra-thin and lightweight. This design uses a 1602LCD liquid crystal display, which can display two lines, each line displays 16 characters, and displays various information such as working status and time.

(4) Keyboard circuit design: The keyboard is an indispensable input device for the microcontroller and a bridge to realize man-machine dialogue. Keyboards can be divided into non-coding keyboards and coding keyboards according to their structural forms. Non-coding keyboards are used in single-chip microcomputers, because non-coding keyboards are simple in structure and low in cost. According to the design tasks and functions of the microwave oven controller, this system has set up four function selection keys.

(5) Sound and light control circuit design: This design uses two control circuits of sound control and light control. The sound control circuit adopts a buzzer control circuit, and the light control circuit adopts a light-emitting diode circuit. The buzzer is an electronic sounder with an integrated structure, powered by DC voltage. When using an LED as an indicating circuit, a current-limiting resistor should be connected in series, and the resistance value of the resistor should be selected according to different operating voltages and the required operating current of the LED.

2. Microwave oven software design

The software design of the circuit is completed through C language programming, and the specific process is shown in Figure 3. After the MCU is powered on, the system initializes, and then waits for the key to be pressed. The four function keys respectively realize the basic functions of thawing, cooking, steaming, and baking. When no key is pressed, all output terminals are at high level. Line output is low level, once a key is pressed, the level of the input line will be pulled down, so that by reading the state of the input line, it can be known whether a key is pressed, and then use the LCD to display the working status and Time, the magnetron starts to work, and when the timing is over, the user is reminded that the work is over by means of sound and light prompts.

Summarize

This design has completed the hardware and software design of the microwave oven controller. The control system is composed of buttons, indicator lights, liquid crystal display and sound and light control. The liquid crystal is used to display the working status and time, and the sound and light prompts make the design more intuitive and humanized. , and the structure is simple, the reliability is high, the price is low, and it has certain practicability.

The above is the development example of the microwave oven controller introduced by Shenzhen Zuchuang Microelectronics Co., Ltd. for you. If you have microwave oven circuit board design needs, you can trust us with confidence. We represent a variety of single-chip microcomputers, voice chips, dual-mode Bluetooth ICs, and wifi chips. Brands include Songhan MCU, Yingguang MCU, Jerry Bluetooth, Ankai Bluetooth, Allwinner, and Realtek. Our technical services include: PCB design, MCU development, Bluetooth solution, software and hardware custom development, APP development, small program development, WeChat official account development, etc. It can also undertake the design of intelligent electronic products, the development of living appliances, the research and development of beauty equipment, the application of Internet of things platform, the smart home control system, the development of TWS earphones, Bluetooth earphone speakers, the development of children's educational toys, the design of electronic education products, etc.