RS232 and RS485 have always been common interfaces in low-voltage applications. Many people mention the differences between them, so today let’s explore them together. 1. Physical Structure of the Interfaces 1. RS232 Interface: One of the computer communication interfaces, the RS-232 interface typically appears in the form of 9 pins (DB-9) or 25 pins (DB-25). … Read more
The connection method for the barcode scanner and Mitsubishi Q series PLC using RS-232C communication (without protocol) will be illustrated as an example. 1 Devices Used 2 Connection Method 3 Configuration of Keyence Barcode Reader 4 Configuration of Mitsubishi Electric PLC Q Series 5 Creating and Transmitting Ladder Diagram Program 6 Execution of Ladder Diagram Program and Monitoring of … Read more
At three o’clock that morning, I was dealing with an unexpected online failure with my colleagues, where dozens of service nodes needed urgent configuration updates. Manual operation? Not realistic. Writing a temporary script? Too slow. At that moment, I remembered the Ansible + Python automation framework I had configured earlier. Within three minutes, all node … Read more
Introduction to Ansible Playbook A Playbook is a component of Ansible used for configuration management. While Ansible’s AD-Hoc command functionality is powerful and can accomplish some basic configuration management tasks, AD-Hoc commands cannot support the configuration management of complex environments. In our practical use of Ansible, most of the time is spent writing Playbooks. In … Read more
Copy files from a remote server to a local computer. This can be accomplished using the Ansible fetch module. This is useful when you want to copy certain log files from a remote server to your local machine. By default, a directory named after each host you are connecting to will be created in the … Read more
Ansible Inventory The inventory is used to define which hosts are managed by Ansible. The inventory supports the following formats: • IP addresses • Hostnames • Ranges (<span>server[b:c]</span>) • Host groups (<span>webserver</span>) • Subgroups (<span>lnmp:children</span>) Inventory 172.25.250.10 [webserver] server[b:c] [mysql] 172.25.250.1[3:4] [lnmp:children] webserver mysql • Directly defining a hostname or address, currently <span>172.25.250.10</span> does not … Read more
The following is a complete process example of BLE technology in typical application scenarios, covering smart home control, health monitoring, asset tracking and IoT data collection. It combines hardware configuration, software processes, communication interactions and code examples to help developers quickly understand the actual application logic: 1. Smart Home Control (e.g., light switch) Scenario Description … Read more
Friends engaged in IoT development are certainly familiar with BLE Mesh technology, especially in the smart home field, where it plays a crucial role. Today, we will specifically discuss Mi Home BLE Mesh, packed with valuable information, so get your notebooks ready and take note of the key points!1. Basic Concepts of SIG BLE MeshBLE … Read more
The market competition is fierce, and you want to keep an eye on your competitors’ every move? Manually collecting data can be exhausting! Why not write a small automated monitoring program in Python that can effortlessly pull competitor dynamics and market data? Today, I will teach you how to create a fun and practical competitor … Read more
Introduction Often, the datasets we need are very large due to high resolution, necessitating storage in chunks (in fact, many high-resolution datasets are provided for download in a chunk-compressed format).The naming convention of these chunk files usually indicates their corresponding latitude and longitude ranges, but finding and verifying them one by one can be cumbersome, … Read more