In view of the fact that once the isolated island phenomenon occurs in the photovoltaic grid-connected system and the photovoltaic system is not cut off in time, it may cause equipment damage and threaten personal safety, so the detection of isolated island needs to be fast and accurate, and the power quality should be taken

This paper designs an air-conditioning controller based on ARM7 ARM7 architecture, which has functions of real-time control, fault handling, real-time process data recording and network transmission of air-conditioning operation information. The software design realizes modular division, and focuses on the design of the core board program and data acquisition board program in the controller. 　　The

This paper uses USB1.1 and USB2.0. USB 1.1 is the basic specification. Based on the CH372 controller, the end-to-end connection between the computer application layer and the local microcontroller is provided. The system uses the request plus response method to communicate. Thus the communication conversion between serial port and USB interface is realized. Experiments show

The main control chip of intelligent temperature and humidity controller is STC89C52, which has the advantages of excellent quality, strong anti-interference ability and high cost performance. The temperature sensor adopts DS18B20, which is fast, compact and not easy to break; the humidity sensor adopts DHT11, which is fast and stable in humidity measurement. The main

Water is the basic condition for human survival. Human beings can never live without water. Water is called the sweet spring of life. For a long time, people generally believe that water is “inexhaustible, inexhaustible”. They do not know how to cherish it and waste it. For a long time, most domestic water meters in

AGV path navigation algorithm is one of the key issues to improve the efficiency of AGV operation. In order to avoid AGV deviating from the established path due to the influence of external uncertainties in the operation process, this paper designs a PID controller for differential drive four-wheel AGV, which can accomplish the task of

DDR SDRAM uses double data rate structure. With its advantages of large capacity, high data transmission rate and low cost, it is increasingly used in high-speed data acquisition systems. The function of DDR controller is designed and implemented by using Cyclone FPGA chip of Altera Company. 　　The design idea is described, which has certain practical

In this paper, a design method of street lamp energy-saving controller based on single-chip computer is discussed. The energy-saving principle of the controller is expounded. The operation mode of reading and writing of DS1302 clock chip is emphasized. The circuit connection diagram and some examples of C language program of single-chip computer are given. With

This paper describes the hardware and software design method of a timing charging controller based on single chip computer, and describes the working principle of the controller. It focuses on the operation mode of reading and writing of LCD module and clock chip, and the principle of on-off control of relay. Some circuit schematic diagrams

Hydraulic support electro-hydraulic control is the key technology to realize the transformation of coal mining from mechanization to automation. Hydraulic support electro-hydraulic control system has become an important symbol of advanced production technology in coal mines. With the continuous development of the hydraulic support electro-hydraulic control system, dozens of sets of hydraulic support electro-hydraulic control