RS-232, RS-485, and RS-422 are common serial communication standards, each with unique characteristics and applicable scenarios. Below is a detailed analysis of these three communication standards: 1. RS-232 1. Origin and Purpose: ● Established by the Electronic Industries Alliance (EIA) in 1962. ● Aimed at solving low-speed, short-distance communication issues between early computers and peripheral … Read more
The differences between traditional Bluetooth and BLE (Bluetooth Low Energy) in Bluetooth BQB certification mainly lie in the following aspects: Application Scenarios and Functional Requirements Traditional Bluetooth: Primarily used in scenarios requiring high-speed data transmission for audio, video, and other large data, such as speakers, headphones, and automotive electronics in traditional data transmission industries, focusing … Read more
The Ansible `cron` module is used to manage scheduled tasks (cron jobs) on remote hosts, allowing you to create, modify, and delete scheduled tasks to ensure specified tasks are executed automatically at designated times. 1. Features of Ansible’s `cron` Module Manage crontab and environment variable entries: You can create environment variables and named crontab entries, … Read more
Ansible Commands Ansible has multiple commands, each serving different functions. Below are some commonly used commands and their parameters. Common Commands # Set the ansible configuration file ansible-config # View ansible related modules and module documentation ansible-doc # View ansible's inventory ansible-inventory # Execute ad-hoc tasks ansible # Execute ansible playbooks ansible-playbook # Set ansible … Read more
Below is a detailed explanation of the workflow of BLE devices, covering the complete process from device startup to data communication, incorporating the core steps of the GAP (Generic Access Profile) and GATT (Generic Attribute Profile) protocols. 1. Device Startup and Initialization Step 1: Hardware Initialization •Hardware Preparation: ￮Power on the BLE chip (e.g., nRF52, … Read more
What? Why do we say “develop”? It’s because it really is a competitive field!For many low-end BLE chips, the main function is simply wireless connectivity; being able to connect and transmit a few data packets is sufficient. Some even do not require a connection, as they can scan and advertise.So what is the biggest cost … Read more
The following are the key strategies and implementation methods for low power design in BLE devices, covering hardware selection, software optimization, protocol configuration, and practical cases to help developers design ultra-low power Bluetooth devices: 1. Hardware Design Optimization (1) Select Low Power Chips •Recommended Chips: ￮nRF52 Series (Nordic Semiconductor): Supports deep sleep modes (e.g., System … Read more
According to Lei Feng Network: NB-IoT (Narrowband Internet of Things) can be deployed directly on existing GSM, UMTS, or LTE networks, occupying very low bandwidth to connect a large number of low-power devices, achieving cost reduction and smooth transition goals. It has already become an important branch of the concept of the Internet of Everything. … Read more
On the afternoon of April 16, the “5G NB-IoT Billion Journey” online industry summit was officially held, with leaders from numerous NB-IoT industry chain companies such as Huawei, HiSilicon, China Mobile IoT, China Unicom IoT, Tianyi IoT, MediaTek, Unisoc, and Quectel participating in the event and sharing their views on the NB-IoT industry and related … Read more
Author: Zhao Xiaofei IoT Think Tank Original Reprint must indicate the source and origin —— 【Introduction】 —— After the maturity of low-power wide-area networks, operators will certainly hope to connect more terminal devices and utilize more public resources. During the large-scale development of the Internet of Things, regulatory agencies will inevitably take action, focusing on … Read more