[i=s]This post was last edited by lugl4313820 on 2021-12-17 22:50[/i]Today I used the serial port assistant to upload MQTT to my server. After half a day's hard work, I finally completed the module co...
Our testing center is an authoritative physical and chemical analysis and testing center approved by the superior competent department, Beijing Academy of Science and Technology, and has the third-par...
[i=s]This post was last edited by hjl240 on 2015-6-26 20:51[/i] [align=left][size=4][font=宋体] I have graduated, and I have sorted out some books. Each book is 6[/color][font=宋体][color=#ff0000]yuan[/co...
[i=s]This post was last edited by 不足论 on 2016-12-25 17:18[/i] I was quite busy recently, so I wrote this article late. Today is December 25th. Calculating the time, it has been 2 and a half years sinc...
[i=s]This post was last edited by freebsder on 2017-3-29 13:26[/i] [size=3][url=http://www.nxp.com/assets/documents/data/en/data-sheets/MKW41Z512.pdf]KW41Z Datasheet[/url] [url=http://www.nxp.com/asse...
[p=30, null, left][font=宋体][font=Verdana][color=#111111] [/color][color=#000000] The most effective way to regulate the current in an LED from a higher input voltage is to use a synchronous buck regul...
The hardware circuit principle is shown in Figure 1. In the specific design, each part should consider the anti-interference problem to minimize the impact of interference on the performance of the...[Details]
0Introduction
In oil drilling, accurate measurement of wellbore posture is the premise of wellbore trajectory control. To this end, this paper fully combines the advantages of single-chip ...[Details]
Signal sources have developed to a very wide range today. We can classify them according to the frequency range: ultra-low frequency (0.1m～1kHz), audio (20Hz～20kHz), video (20kHz～10MHz), radio fre...[Details]
Abstract: This paper introduces the origin and new features of MP4, and introduces the core audio compression technology MPEG-2 AAC (Advanced Audio Coding) based on MP4. Finally, it briefly summari...[Details]
Fieldbus is an open, digital, multi-point communication control system local area network, and is one of the most promising technologies in today's automation field. CAN bus is a hot application in fi...[Details]
The full name of RFID is Radio Frequency Identification, which uses radio frequency to realize data transmission between programmable controller (PLC) or microcomputer (PC) and identification, ther...[Details]
0 Introduction
With the release of the "Elevator Supervision and Inspection Regulations", new requirements have been put forward for the inspection quality of elevators by inspection agenc...[Details]
The dual-field-of-view infrared optical system can simultaneously provide two images with different magnifications and fields of view. The large field of view in the system has a lower resolution a...[Details]
Low-frequency induction communication is to generate a certain alternating current in the transmitter after the data to be transmitted is modulated by a low-frequency carrier, amplified by the...[Details]
O Introduction
Semiconductor laser (LD) is a solid light source. It has been widely used due to its advantages such as good monochromaticity, small size, light weight, low price and low po...[Details]
Historically, GPS receiver designers have combined simulation and drive testing to determine receiver performance in complex environments. While GPS signal simulation provides a repeatable signal s...[Details]
Preface
In people's daily life and work, the amount of electricity consumed by computers is very considerable, so the industry pays great attention to energy saving and consumption reduct...[Details]
1 Introduction
Heat flow, also known as heat flux density, refers to the amount of heat (vector) transferred per unit area per unit time. Its characterization is the amount of heat transfe...[Details]
In the current international financial crisis, video surveillance is one of the few industries that has grown against the market trend. Market research firm ABI Research predicts that in 2009, two ...[Details]
The power management system of a netbook can be divided into the following parts: 1. Battery charging and management; 2. CPU processor power supply; 3. System 5V/3.3V power supply; 4. I/O and graph...[Details]
RF/Wirelessly
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