1 Introduction
The one-chip computer is an integrated circuit chip. With the penetration of the computer in the social field, the application of the single-chip microcomputer is continually going deeper, and at the same time, the traditional control detection is updated. In the real-time detection and automatic control of the single-chip application system, the single-chip microcomputer is often used as a core component. The knowledge of the single-chip microcomputer is not enough. It should also be perfected according to the specific hardware structure and the software combination for the specific application object characteristics. . Due to the advantages of simple and practical, high reliability, good performance and price ratio, and small size, the single-chip microcomputer has been rapidly developed in various technical fields. Digital Voltmeter (Digital Voltmeter) is a digital measurement technology that converts continuous analog (DC input voltage) into discrete, discrete digital form and displays it. The traditional pointer voltmeter has a single function and low precision, which can not meet the needs of the digital age. The digital voltmeter of the single-chip microcomputer has high precision, strong anti-interference ability, strong expandability, convenient integration, and real-time communication with PC. . At present, digital voltmeters composed of various single-chip A/D converters have been widely used in the fields of intelligent measurement such as electronic and electrical measurement, industrial automation instruments, and automatic test systems, showing strong vitality. At the same time, various general-purpose and special-purpose digital instrumentation expanded by DVM have also raised the power and non-electricity measurement technology to a new level. This design focuses on the operation of a single-chip A/D converter and a microcontroller-based digital voltmeter.
2 overall design
2.1 Road plan ideas
According to the system function requirements, it is decided that the control system adopts AT89S51 single-chip microcomputer, and the A/D conversion adopts ADC0809. In addition to ensuring the required functions, the system can also easily expand its functions. This article uses AT89s51 as the core component. The AT89S51 is a low-power, high-performance CMOS 8-bit MCU with 4k Bytes ISP (In-system programmable) flash-ready program memory that can be repeatedly erased 1000 times. The device uses ATMEL. The company's high-density, non-volatile memory technology is compatible with the standard MCS-51 command system and 80C51 pin structure. The chip integrates a universal 8-bit CPU and ISP Flash memory unit. The AT89S51 is a powerful microcomputer. A cost-effective solution for many embedded control applications.
Using NS's 8-bit sequential high-precision analog-to-digital converter ADC0809, ADC0809 is a CMOS with 8-bit A/D converter, 8-way multiplexer, and microprocessor-compatible control logic. Component. It is a successive approximation A/D converter that can interface directly with a microcontroller. The voltage taken is processed and then sent to the MCU through the P port of the MCU and then processed by the program, and the voltage value is displayed by the LED circuit. The single-chip microcomputer plus the peripheral serial port display circuit is composed of 74LS245 and digital tube triode.
The device is manufactured using ATMEL's high-density, non-volatile memory technology and is compatible with standard 8051 instruction systems and pins. It integrates Flash program memory, which can be programmed in both online (ISP) and traditional methods, and a general 8-bit microprocessor in a single chip. ATMEL's powerful, low-cost AT89s51 microcontroller can provide you with many cost-effective Applications can be flexibly applied to a variety of control areas.
2.2 Design block diagram
Figure 1 digital voltmeter system design
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