STC89C52 MCU Research Articles

Design of a Variable Frequency and Energy Aeroengine Ignition Device Based on MCU

That the aeroengine ignition device’s ignition properties are set as a rule of thumb causes the waste of ignition device’s resources, low efficiency of aeroengine’s operation, and short service life of plugs. In this paper, a variable frequency and energy aeroengine ignition device is developed for improving aeroengine combustion chamber’s ignition properties. The STC89C52 MCU was chosen as the device’s core controller. Power supply circuit, MCU and external circuit, IGBT drive circuit, boost circuit, current-voltage monitor circuit, and discharge circuit are all part of the hardware circuit. Because the MCU is in charge of driving the IGBT and discharging the capacitor, the device can accurately generate a corresponding frequency output signal. It also creates frequency control and energy control modules, both of which can adjust ignition properties according to user needs. The ignition device proposed in this paper is stable and lighter and has a predetermined frequency and energy. It lays the groundwork for improving the aeroengine's ignition reliability.

Design of Intelligent Fresh Air System Based on STC89C52 Single Chip Microcomputer

The air quality and cockpit environment inside the car are more and more concerned by the majority of drivers and passengers. The intelligent fresh air system in the car relies on STC89C52 MCU which equipped with infrared PM2.5 dust sensor module, DHT11 temperature and humidity sensor and mq135 air quality sensor to realize the real-time detection of PM2.5, temperature, humidity and harmful gases in the car. And the system can call the corresponding actuator to improve the air quality in the car. It puts forward the recovery and reuse strategy of vehicle air conditioning condensate. After disinfection, the condensation water is used to humidify the air in the vehicle, cool and clean the radiator of the vehicle air conditioner. Finally, the purpose of intelligent purification of the air environment in the car is achieved.

Design of Solar Energy Automatic Tracking System Based on STC89C52

This paper designs a solar energy automatic tracking system based on STC89C52. The photoelectric sensor collects the sunlight signal. After A/D conversion, the collected signal is sent to STC89C52. After data comparison, MCU sends out control signals. The step motor is used to control the level and pitch angle of the solar panel, so that it always faces the direction of sunlight, and realizes the sunlight tracking. The hardware design includes the minimum system of STC89C52 MCU, sunlight signal acquisition circuit, A/D conversion circuit, key circuit, motor drive circuit, etc. The software is written in C language, including main program, data acquisition subroutine, key reading subroutine, data comparison subroutine, etc. Through physical production and operation debugging, the design function is normal.

Research and Implementation of Electric Bicycle Anti-Theft System

Electric bicycles are energy-saving, environment-friendly, lightweight, labour-saving, fast and reliable, and can meet the requirements of national energy-saving and emission reduction policies and scientific development concept. They are the first choice for consumers to travel in cities. The phenomenon of theft and loss is becoming more and more serious. Improving the anti-theft system of electric vehicles on the market has become an urgent livelihood and social problem to be solved. This paper mainly uses STC89C52 MCU as the main control chip to design an anti-theft system for electric bicycle. It realizes the functions of two-way vibration detection, sound and light alarm, mobile phone short message alarm, GSM short message remote power cut and short message remote control. The system has low power consumption, stable performance, low cost and wide application prospects.

Design of Simulated Small Smart Home System

With the progress of science and technology and the improvement of economic level, people have a higher pursuit of the quality of life at home, thus promoting the rapid development of smart home industry. This paper mainly focuses on the research of smart home system. A smart home system which can provide people with comfortable, safe and convenient home environment is simulated and designed with STC89C52 MCU as the main control chip. The design and operation of the system are simple, convenient, low power consumption, stable performance and low cost, which has certain practical application value.

Design of automatic watering system based on STC89C52 MCU

This design uses the STC89C52 microcontroller and the ADC0832 converter as the core of the system, according to the soil YL-69 soil humidity detected current, compared with the set temperature range suitable for plant growth, if soil moisture value is lower than the set limit value range of SCM, SC M control relay switch is closed, the motor pump to work; if the detection of soil moisture is higher than the value set the upper limit value of “single chip” microcomputer control switch, relay, motor pump stop working. The process of continuous detection and judgment, is the focus of the system function design.

Design of intelligent LED lighting systems based on STC89C52 microcomputer

In this paper, a kind of intelligent LED lighting system was designed, and intelligent processing and control technology were obtained based on STC89C52 MCU minimum system, which combining with the LED lighting technology, infrared sensing technology, photoelectric detection technology. The system can intelligently test the design of LED lighting system, realize the intensity of light control, infrared detection and the measurement of light intensity, reflecting the intelligence and humanity of LED lights, and further to achieve energy-saving green lighting.

Design of Fuzzy PID Temperature Control System

Temperature plays an important role in daily life, industry production and scientific experimentation. However, because of the multi characteristics of nonlinearity, large lag, and time-varying of control objects, there will be great difficulties in establishing accurate mathematical models with mathematical methods. In order to achieve well controlling effects, this paper proposes a mature controlling system. This system combines PID algorithm and fuzzy control to design a fuzzy PID intelligent controller, which could process complex data and complex systems simultaneously. The high flexibility of fuzzy control and the high precision of PID control of this system could solve the influence of large inertia and interference of the temperature control system. This design will adopt the STC89C52 MCU as the main control core. Meanwhile, the fuzzy PID controller are combined with fuzzy control and PID control to control the temperature. In this paper, we first introduce the hardware composition of PID temperature control system. Secondly, we use proteus to build the general circuit diagram, and then use KEIL software to program again. Finally, we simulate the system and analyze the simulation results by the simulink module in MATLAB, and finally achieve the expected results.

无线温度采集预警系统设计

本文介绍了采用温度传感器DS18B20采集温度、STC89C52单片机处理、LCD1602液晶显示、及NRF24L01无线收发一体模块组成的新型温度无线采集预警系统，该系统以STC89C52单片机为控制核心，利用温度传感器 DS18B20测量温度值，NRF24L01实现温度的传输。本系统分三个测温段，分别为：恒温运输18℃~22℃、冷藏运输0℃~7℃、冷冻运输−18℃~−22℃。在三个分段车厢内，一旦温度超过其上限值或下限值，接收端单片机便启动报警系统。该系统精度高、测温准确、报警及时，可广泛应用于冷藏车运输。 This paper introduces a new kind of wireless temperature acquisition using temperature sensor DS18B20 temperature acquisition, STC89C52 MCU processing, LCD1602 liquid crystal display, and nRF24L01 wireless transceiver integrated module is composed of a novel temperature collection and wireless early warning system is introduced in this paper, the system uses STC89C52 MCU as control core, using temperature sensor DS18B20 temperature measurement value, nRF24L01 achieve the temperature transmission. The system is divided into three measuring section, re-spectively: transportation with constant temperature of 18 degrees - 22 degrees C, refrigerated transport 0 DEG C - 7 DEG C, refrigerated transport −18 DEG C - −22 degrees. Repeated segments inside, once the temperature exceeds the upper or lower limit, the receiver chip will activate alarm system. The system has high precision, accurate temperature measurement and alarm, which can be widely used in the transport of refrigerated trucks.

Design of Dual-channel Sine Wave Generator with Tunable Phase Difference

Signal source is an important part of modern electronic system and has a wide range of applications in the fields of communication, measuring & control, navigation and medical care. This project developed a new dual-channel sine wave generator with Tunable Phase Difference on the basis of the direct digital frequency synthesis (DDS) technology. Design was accomplished using STC89C52 MCU and FPGA as the control center, integrating basic operation circuit and employing low-pass filter and the necessary software algorithm. The experimental results showed that the system can produce dual sine waves with tunable phase difference in 0~359° range. The system is stable in work and it is easy to adjust parameters.

Application of Distributed Measurement and Control System

Measurement and control system plays a gatekeeper and director role in industrial production. It obtains various parameters from the production site, in order to meet the needs of production, improve quality, ensure safety in production. Distributed measurement and control systems scalability, inexpensive cost and other factors have been widely used. This paper mainly discusses a distributed measurement and control system which based on STC89C52 MCU, RS485 bus, 18B20 temperature components and ADS7822 voltage acquisition components with a main control terminal and three nodes, through RS485 communications. The main control terminal has keyboard and LCD1602 displayer, which can read each node state. Each node refers to one of the measurement and control items below (temperature measurement, current or voltage measurement, switch input measurement and switch output control).

The Measure and Control System Design for Temperature and Humidity in General Storeroom

Based on the STC89C52 MCU as the core, this paper designs the measure and control system for temperature and humidity in general storeroom. The system includes two parts: hardware circuits design and software design. The hardware circuits include MCU smallest system, temperature and humidity signal acquisition circuit, keyboard circuit, LCD display circuit, control circuit and alarm circuit; the software includes main program and subroutines (temperature and humidity setting, acquisition, display and overrun processing, etc.). Through system function debugging, the system can realize the temperature and humidity information acquisition, display and control.