/************************************************************************ * * Method to connect the upper four bits of LCD1602 display * * Description: 4-line data width, operate Lcd1602 * Display Hel...
Specifically, P1.4 sends a high level, allowing P1.2 and P1.7 to collect the voltage. In order to save power, this high level can only be maintained for 16 microseconds. I now find that if P1.4 is alw...
[i=s]This post was last edited by paulhyde on 2014-9-15 04:06[/i] Here is a list of components from previous years, which may help you analyze this year's competition questions!...
Due to the changes in system memory, the memory allocation needs to be modified in the BSP. The CPU used is MPC8270, and the memory controller corresponds to 12 banks CS0-CS11. Now the space correspon...
SAMR21 LED and Key There is a user key and a user LED light in the SAMR21 Xplained Pro development board. The hardware connection diagram is as follows: Figure 4-1: LED&KEY circuit diagram You can see...
The 485 bus of stm32 uses interrupts to send and receive. It can send and receive, but a byte (00 or CD) is inserted in the received byte. What's going on? Can anyone give me some advice? ?...
Emergency hand-held lamps powered by 6V maintenance-free batteries are widely used in rural areas. The charger used is a transformer step-down and single diode half-wave rectifier, and the charging...[Details]
With the rapid development of science and technology, especially the widespread application of digital technology and various ultra-large-scale integrated circuits, electronic equipment, especially...[Details]
This article discusses how to wake up a touch-sensitive device such as a tablet without touching the device, using basic gesture recognition and novel proximity sensors. The article discusses the p...[Details]
System design is a complex process. It is not enough to just use ICs. There are many details to consider. This article uses a high-fidelity music playback system as an example to introduce how to s...[Details]
1. What is temperature?
Heat is a type of molecular motion. The hotter an object is, the faster its molecules move. Absolute zero is defined as the temperature at which all molecular motion ...[Details]
1. Introduction to CIF Board
Fieldbus integration based on PC system
Whether it is a master or a slave, fieldbus has won unanimous praise in the field of PC-based automation. For more...[Details]
The automotive lighting and signal control system is responsible for controlling the vehicle's lighting, signal lights, electric horns, reversing and brake buzzers. Traditional automotive lighting...[Details]
The typical fault troubleshooting listed below is for reference of maintenance personnel.
When the computer is turned on, the indicator light is off and there is no screen display
Mainte...[Details]
In recent years, with the rapid development of the information industry, dot matrix LED display screens have been widely used in various advertising and information display systems such as the fina...[Details]
With the advocacy and implementation of the government's Safe City Plan, the security market has increasingly higher requirements for the clarity of surveillance images. Imagine that after a case o...[Details]
12v Lead Acid batteries used in trucks, cars, RVs and uninterruptible power supplies are usually rated at 12V. This circuit monitors the battery, the charge and discharge curves, gives the cu...[Details]
introduction
MAX6636 is a multi-channel precision temperature monitor that can not only monitor local temperature, but also connect up to 6 diodes externally. Each channel has a programmable...[Details]
Today, the value of electronic components in cars accounts for 15-20% of the total vehicle. In the future, this proportion may be as high as 30-40% as more safety electronics, fuel consumption and ...[Details]
Introduction
Nowadays, people pay more and more attention to the security alarm system, and people have higher and higher requirements for the functions and performance of the alarm. This paper prop...[Details]
Introduction
In industrial control, speed measurement is often required. Generally, a contact tachometer is used. This tachometer must be placed against the center of the shaft to measure. It...[Details]