When the PC communicates with the PLC via the MODBUS protocol, the mapping table given is as follows: H0000 P area H1000 M area H2000 L area H3000 K area Now I have trouble reading and writing an M190...
The current module is the communication between PDA and MCU. 1. The code compiled under EVC4 has no problem in simulating communication through PC2003. The sending and receiving data are normal. But w...
In modern life, mobile phones have gradually become an indispensable part of people's lives. However, this thing may be out of power at any time! ! How can it be out of power at a critical moment! Now...
The board is powered by a button battery, which is 3V. TVS is used to prevent electrostatic breakdown. Under the condition of 1A test, the clamping voltage is 7V. Some people suggest using a TVS with ...
This paper introduces the hardware structure and design principle of a unit attendance system based on a new type of automatic identification chip iButtonTM, and gives the working process of the syste...
In order to prevent traffic accidents, when the intelligent detection device of the car detects danger ahead, it must send a warning message to the driver. The voice alarm clearly reminds the drive...[Details]
This article discusses how to use an ultra-low-power RF transceiver chip from Zarlink Semiconductor for pacemakers, neurostimulators, drug pumps, and other such implantable medical devices to achiev...[Details]
Third generation (3G) mobile phones offer a variety of features with more functionality. As consumers enjoy the latest and better features of these communication devices, they continue to demand lo...[Details]
introduction
The most common flight state of a fixed-wing aircraft is horizontal flight. If it is allowed to fly at a large angle, the action cannot be maintained all the time. If it is al...[Details]
There are many ways to attenuate signals. The most commonly used method is to divide the voltage using resistors. The common circuits are as follows:
Oscilloscope pre-stage attenuation c...[Details]
Among the many candidate standards for China's mobile TV, the CMMB standard proposed by the Broadcasting Science Research Institute of the State Administration of Radio, Film and Television is aime...[Details]
As process nodes and die sizes continue to shrink, the number of consumer electronic products using flip-chip packaged IC devices is increasing. However, flip-chip packaging manufacturing rules hav...[Details]
1 Design Concept
The car instrument is a window and interface for information exchange between the driver and the car, which plays a positive and important role in improving the service li...[Details]
Modern high-rise buildings are like a small city arranged vertically, with a high concentration of people and complex and diverse functions. There are many combustible materials in the interior dec...[Details]
0 Introduction
At present, the main task of oil production plants is oil pumping production. The distribution points of oil pumping units are wide and wide. They work in harsh environments...[Details]
Today, CMOS technology allows an FPGA device to have multiple I/O interfaces. At the same time, in recent years, low power consumption has begun to become the mainstream concept of high-speed I/O i...[Details]
1 Introduction
In order for a mobile robot to operate in an uncertain environment, it must have the functions of automatic navigation and obstacle avoidance. In the navigation system of a ...[Details]
With the rapid development of power electronics technology, nonlinear loads in power systems have increased significantly, and various nonlinear and time-varying electronic devices such as inverter...[Details]
1 Introduction
The system integration technology (SI) introduced in this article is an emerging technology. In large-scale systems (such as national networking), corresponding control soft...[Details]
Abstract: A design method for the interface between DSP and A/D and D/A with minimal hardware generation and simple software control. This method uses the program control capability of DSP to co...[Details]
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