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ESP32 MCU learning notes - 02 - Software IIC & hardware SPI Preface, continue the content of the previous article. In order not to accumulate too much content, write it separately. 1, ESP32 read gyroscope (IIC) Official routine: github:esp-idf/examples/peripherals/i2c/i2c_self_test/ iic is the official software used by iic before ...

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  ANSA is a very powerful and fast pre-processing software. As everyone who has used it knows, ANSA is particularly outstanding in geometric cleaning and model simplification. Moreover, ANSA also provides a secondary development interface based on python language, which greatly meets the needs of users. The basic idea behind the scripti ...

introduce precondition This tutorial assumes that RabbitMQ has install And run in Standard port (5672). If you use different hosts, ports, or credentials, you need to adjust the connection settings. Where can I get help If you have problems reading this tutorial, you can mailing list Or RabbitMQ community Slack contact us. ...

Object->DispatcherObject->DependencyObject->Visual->UIElement->FrameworkElement->Control->DatePicker DatePicker Represents a control that allows the user to select a date. DatePicker Control allows the user to Calendar Use the drop-down control to type or select a date in the text field. Should DatePicker's Only Gregori ...

Chapter 2 MybatisPlus general CRUD 1. Overview Recall that if we have a User table and have created the corresponding entity class, what do we need to do to implement the CRUD operation of the User table? Steps for Mybatis universal CRUD First, we need to write the UserMapper mapping interface and manually define the CRUD method in the ...

Introduction to safety management In the actual development, some applications usually need to consider the security problem. For example, for some important operations, some requests can be executed only after the user verifies his identity, and some requests can be executed only after the user has specific permissions. The significance ...

1 windowing function The OVER clause is allowed only in the SELECT and ORDER BY processing phases Two sum()over() in a select cannot be dividedLogical order of sql execution: FROM,WHERE,GROUP BY,HAVING, SELECT ,OVER,DISTINCE, TOP,ORDER BYData scenario According to the above data, it is necessary to count how many customers wechat experts ...

This article is the original article of CSDN blogger "shining sun", which follows the CC 4.0 BY-SA copyright agreement. For reprint, please attach the source link of the original text and this statement. Original link: https://blog.csdn.net/qq_16804847/article/details/116227307 1.1 environment switching 1.1.1 business requirements ...

1, Title Description Because the screen of MP3 Player is small, when displaying the list of songs, only a few songs can be displayed on each screen. Users can browse all songs through up and down buttons. In order to simplify the processing, it is assumed that only 4 songs can be displayed on each screen, and the initial position of the cursor ...