Scrapy can collect data directly through HTTP requests. The scrapy crawler framework does not provide page js rendering services, so we cannot get information, so we need a rendering engine to provide...
[i=s]This post was last edited by qwqwqw2088 on 2021-5-6 08:19[/i]When I first started using desktop computers, I took them apart and looked at the complex motherboards filled with various slots, chip...
Flexible and simplified programming processes enable designers to apply a single IC to a variety of use cases, helping manufacturers shorten time to market and reduce bill of materials costs, which is...
[i=s]This post was last edited by wuguangtao on 2020-12-24 08:41[/i] # MSP430F5529 drives 2.2-inch TFT color screen and implements Snake**Snake**, a timeless little game. When I was an undergraduate, ...
1. InterruptionPIE is a peripheral interrupt expansion module, with a total of 96 interrupts after expansion2. Clock28027 series peripheral support3. Watchdog...
[i=s]This post was last edited by donghailao on 2021-11-24 18:04[/i]In order to train students' creative thinking, the teacher gave a thinking question....
Regarding the protection of low battery voltage, today I have designed a battery power shortage protection circuit for you. The manual switch is a hiccup protection with an interval of about 30 secon...[Details]
Hardware platform: UT-S3C6410 development board (UT-S3C6410 series development board) produced by UT-Hengtian Technology
Software platform: ut6410-android2.1-v2.1
Introduction: The ...[Details]
I won't say more. We all know that for the convenience of operation, we often use something like LED1 = 1 to light up a light. Here, LED1 is a pin. It is certainly not built-in by the system. General...[Details]
The Galaxy Fold foldable phone is about to go on sale in the United States, but a folding screen defect has appeared. American technology media TechCrunch reported that the Galaxy Fold had defects af...[Details]
Power semiconductors are the core of power conversion and circuit control in electronic devices. They mainly refer to discrete semiconductor devices that can withstand high voltage or high current. T...[Details]
Recently, the final list of winners of the 2019 "IoT Star" China IoT Industry Annual Selection was officially released. As an annual selection event that has attracted much attention in the IoT field...[Details]
This morning, Xiaomi CEO Lei Jun posted on Weibo, talking about the first release of Snapdragon 8 Gen 1. He said that the first release is to lead the entire industry chain and define the perfo...[Details]
Since the steps for STM32 under Ubuntu are the same as those introduced previously, we will not introduce them in detail in this article. We will just briefly talk about what we need to prepare. Op...[Details]
Function of the circuit
In any high-frequency circuit, the diode used to rectify the signal voltage is difficult to form a linear detection circuit considering the characteristi...[Details]
When something right becomes a habit, it has a positive and long-term impact on a person, and it is also of great significance. Developing the habit of using an oscilloscope will also have a lifelong...[Details]
【JDPCB】Qisda is introducing smart factories in phases. Chairman Chen Qihong said yesterday (25th) that through high automation, order delivery can be accelerated. The current benefits have reached a...[Details]
1. Detection of low power crystal diodes
A. Identify positive and negative electrodes
(a) Observe the symbol on the shell. Usually, the diode symbol is marked on the shell of the diode. T...[Details]
A user uses an oscilloscope to test the 25MHz clock signal frequency generated by a crystal oscillator. The nominal accuracy of the crystal oscillator itself is ±5ppm (1ppm is one millionth), and the ...[Details]
Q: When measuring a device under test (DUT) with a vector network analyzer, what is the uncertainty in the impedance and return loss (S11) measurements if the input impedance is approximately 3 ohms ...[Details]
Driven by the surge in computing power demand in large AI models and edge intelligence, the market demand for high-performance storage solutions is also increasing. Based on this forecast,
the ...[Details]
Programming Basics
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