The relationship between wireless transmission distance, transmission power and frequencyPower sensitivity (dBm dBmV dBuV)dBm=10log(Pout/1mW), where Pout is the power value in mWdBmV=20log(Vout /1mV),...
Summarizing the anti-theft experience of more than 20 years, I would like to share it with readers. 1. Stores should keep as little cash as possible at night. If conditions permit, you can leave someo...
How knowledgeable are you? What kind of electronic device is this (the IC circled in the picture below)? It is used in the power supply. Is it an inductor?
I've seen it before, don't know what it was....
I used mcbsp to collect AD, and I need to put the collected data into the memory card, so I used the ping-pong cache method. Every time I collected a number, I used DMA to move it to the memory. When ...
1. Overview
Will passive devices
produce nonlinear intermodulation distortion? The answer is yes! Although there is no systematic theoretical analysis, it has been found in engineerin...[Details]
No matter which processor you are learning, the first thing you need to understand is the registers and working mode of the processor.
ARM has 37 registers, including 31 general registers and ...[Details]
1. Overview
At present, an information revolution is in the ascendant around the world, led by microelectronics, computers and communication technologies, and centered on information technolog...[Details]
1 Introduction
With the improvement of people's quality of life, lamps are no longer just basic indoor lighting tools, but also a kind of practical art for architectural decoration. When ther...[Details]
The DisplayPort interface standard is approved by the Video Electronics Standards Association (VESA) to provide an open, scalable standard for the entire industry. The development of DisplayPort ca...[Details]
Overview
By transmitting ultrasonic energy into the human body and receiving and processing the returning reflected signals, phased array ultrasound systems can generate images of organs and s...[Details]
1. Sensor
According to the national standard GB7665-87, a sensor is defined as a device that can sense the specified measured quantity and convert it into a usable output signal according to a...[Details]
According to a survey by the International Energy Agency, Asia and Australia used 1.65 trillion liters of oil for energy in 2004. The survey also showed that since 1990, the demand for oil has been...[Details]
In recent years, the rapid development of high-performance digital signal processing chip DSP (Digital Signal Process) technology has made it possible to realize real-time speech recognition. Amo...[Details]
LED headlight
Refers to car headlights that use white LEDs. Toyota's top-of-the-line hybrid car, the Lexus LS600h, released on May 17, 2007, was equipped with white light-e...[Details]
VGA (Video Graphics Array) is a graphics display standard proposed by IBM in 1987. Although it is no longer an advanced display standard, it is still widely used due to its mature technology and pr...[Details]
Communication protocol: The first byte, MSB is 1, which is the first byte mark, the second byte, MSB is 0, which is the non-first byte mark, and so on... The last byte is the XOR checksum of the la...[Details]
1 Introduction
With the development of transmission systems in recent years, multi-motor transmission systems have been widely used in various fields. In order to improve the dynamic performan...[Details]
The treatment capacity of a sewage treatment plant in Shanghai is 10,000 m³/day, and the number of monitoring points is not large. The selection of S7-300 PLC plus Beijing Dingshi DS300B distributed I...[Details]
The power consumption of digital cameras is a big problem. Even if you have enough batteries, it will cause a lot of trouble because you have to replace the batteries frequently, not to mention the...[Details]