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On March 13, 2019, China Quality Certification Center (CQC) issued Huawei a 1500V string inverter new energy standard certification, which was the first certification since the new version of the e...[Details]
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I. Introduction According to statistics, the annual capacity of single-chip microcomputers in my country has reached 100-300 million pieces, and it is growing at a rate of about 16% per year, but my ...[Details]
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Introduction Frequency is one of the most important characteristics of a signal, but engineers often wonder: Why do the frequency measurement results of a hardware frequency meter and an oscilloscope...[Details]
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For Apple phone users, the appearance and color have always been something they dare not ask for. For Apple, the rounded appearance has not changed for more than ten years, and there are only a few c...[Details]
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C code:
#include reg52.h
#define uint unsigned int
#define uchar unsigned char
sbit K1 = P3^0;
sbit K2 = P3^1;
sbit K3 = P3^2;
sbit K4 = P3^3;
sbit K5 = P3^4;
sbit K6 = P3^5;
sbit K7 = P3^6...[Details]
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The U.S. International Trade Commission (ITC) recently announced that the U.S. company Tela Innovations, Inc. has filed a 337 investigation application with the ITC, accusing Acer, Asus, Lenovo, MSI ...[Details]
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1 Introduction Frequency characteristics are the response characteristics of a system (or component) to sinusoidal input signals of different frequencies. As shown in Figure 1, the input of the measu...[Details]
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GPRS is a data service developed on the basis of the currently running GSM network. It can use the same modulation technology, frequency, and TDMA frame structure as GSM. Utilizing the existing bas...[Details]
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Conventionally, the ternary materials we refer to generally refer to nickel cobalt manganese oxide lithium NCM positive electrode materials (in fact, there are also negative electrode ternary materi...[Details]
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The spectrum analyzer is one of the most commonly used equipment by radio frequency engineers. Many radio frequency parameters such as signal frequency, power, harmonics, and phase noise need to be t...[Details]
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1. Connection between Siemens S7-1200 and incremental encoder
The digital input switch points of Siemens S7-1200 all provide a fast counter function for incremental encoder pulse signals. The ...[Details]
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The power supply rejection ratio (PSRR) has long been a great way to assess an amplifier’s ability to reject power supply noise at its output, but with the popularity and performance advantages of Cla...[Details]
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In the past two days, I studied the CRC algorithm at home because I needed to verify the data read by DS18B20 with AVR. I learned some methods on the Internet and finally figured it out. I wrote it i...[Details]
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However, the cost of these devices increases rapidly if the temperature of multiple test points on the board needs to be measured. This in turn creates an urgent need for efficient, compact and low-co...[Details]
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1. Why do we need DMA?
First, let's look at the serial port to transmit information: sending strings.
Send function: Add the following send function in uart.c:
Next c...[Details]
Analog electronics
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