As shown in the figure, the three red components in the schematic diagram of the product on the right are not included in the reference circuit. What are the functions of these components? How to sele...
NRF24LE1RF24LE1 adopts Nordic's latest wireless and ultra-low power technology. It integrates a single-chip Flash chip including 2.4GHz wireless transmission, enhanced 51 Flask high-speed microcontrol...
Now that the development environment is configured, let's test the IO. Let's start with the simplest LedBlink
It is also relatively simple to use, basically the same as STM32
1. Enable GPIO RCC first
...
1: The PCB design requirements for this board are not high, so use thinner wires and use automatic wiring. Comment: Automatic wiring will inevitably occupy a larger PCB area and generate many times mo...
1. Internal Principle of Relay
The interior of a relay consists of two parts: a coil and contacts.
When the coil is de-energized, the common is connected to the normally closed contact (N...[Details]
Let's take a look at the contents of the wwdg.c file: u8 WWDG_CNT=0X7F; // Initialize window watchdog //tr :T , counter value wr :W , window value //fprer: frequency division coefficient (WDGTB...[Details]
With the development of modern commerce and finance, the proportion of electronic bank card payments and card consumption is increasing. In order to adapt to this change, UnionPay Center and commercia...[Details]
We use PWM to control the buzzer, which mainly has two functions: one is to enable the buzzer and set its frequency; the other is to disable the buzzer. These operations can be completed through io...[Details]
Driven by market demands such as 5G and data centers, memory prices bottomed out and rebounded since the fourth quarter of 2019. Upstream manufacturers have significantly raised their ex-factory pric...[Details]
Due to the rise in oil prices and the impact of electric vehicle range anxiety and charging difficulties, hybrid vehicles, which were originally regarded as transitional products, have become "hot ca...[Details]
Abstract: A new fluorescent lamp dimming control method is introduced, which controls the output power of fluorescent lamps by asymmetric duty cycle modulation. Firstly, based on the fluorescent ...[Details]
As a type of screen with short response time and wide popularity, TN screen has obvious advantages and disadvantages. IPS screen, developed to address the disadvantages of TN screen , makes up fo...[Details]
The I2C bus is composed of the serial data line SDA and the serial clock line SCL, which can send and receive data. It allows several compatible devices to share the bus. All devices and interface ci...[Details]
Current feedback amplifiers are not limited by the fundamental gain-bandwidth product and suffer very little loss in bandwidth as signal amplitude increases. Because they can condition large signals w...[Details]
Install 51 and ARM KEIL separately, they are in different folders, in order to extract the C51 folder. Then the question is, can they be installed in the same folder? Theoretically it works, but I ha...[Details]
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]
Heart rate signal acquisition preprocessing circuit: The pulse signal acquisition preprocessing circuit mainly converts the pulse wave into an electrical signal and performs preliminary high-frequ...[Details]
As shown in the figure. The temperature control range of the electric soldering iron is 100℃～400℃, the temperature adjustment mark indicates low, medium and high positions, the temperature control ac...[Details]
Everyday traffic jams pose a safety risk to vulnerable road users. According to foreign media reports, Volvo Trucks has launched two safety systems that focus on protecting pedestrians and cyclists...[Details]
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