In embedded development, the Internet of Things, and debugging communication modules, there is an important tool that you will inevitably encounter — AT Commands. Whether it is making calls and sending messages with GSM modules, connecting to the internet with WiFi modules, pairing with Bluetooth modules, or obtaining positioning with GNSS modules, AT commands serve … Read more
JDY-31 Bluetooth Module Testing –– 1. Introduction JDY-31 Bluetooth is designed based on Bluetooth 3.0 SPP, allowing support for Windows, Linux, and Android data transmission. It operates in the 2.4GHz frequency band, uses GFSK modulation, has a maximum transmission power of 8dB, and a maximum transmission distance of 30 meters. Users can modify the device … Read more
Recently, I have been developing with Bluetooth modules and summarizing some experiences to share, making it easier for everyone to get started quickly.Development scenario description: wireless data communication, replacing wired serial ports, viewing on mobile phones, without complex applications like audio or pairing.Why use Bluetooth?Common wireless communication methods include Bluetooth, WIFI, and 4G/5G. Under Bluetooth … Read more
Click the blue text above to follow me～ Recently, a friend asked me to help debug a Bluetooth printer. I had no choice but to take on the task, so I immediately bought an HC-05 Bluetooth module (note that it is HC-05). Below, I will share my debugging method: Power on while pressing the button … Read more
To enable the entire system to be as wireless as possible and reduce the number of connections to the PC, while leaving an interface for future mobile control, I chose the HC-05 Bluetooth module (shown below) to transmit serial control commands via Bluetooth. The usage of this module is referenced from “Arduino—HC-05 Bluetooth Module”. I … Read more
HC-05 is a Bluetooth module that connects to the serial port of a microcontroller, allowing the microcontroller to communicate with other devices via Bluetooth. The module itself can operate in master and slave modes and can be used for various applications, such as smart home applications, remote control, data logging applications, robotics,monitoring systems, etc. The … Read more
JDY-31 The JDY-31 Bluetooth module is a small device like the one shown below. It can be purchased for about seven to eight yuan on Taobao; do not buy it for more than ten yuan. The JDY has a total of 6 pins, but to make it work, we only need to connect two wires: … Read more
Introduction A while ago, I posted an article about the JDY-31 Bluetooth module, so today I am writing an article about another model of Bluetooth module. Because the JDY-31 can only act as a slave, while the HC-05 can act as both a master and a slave. This is understandable, as the JDY-31 is relatively … Read more
Bluetooth is a familiar technology to everyone, as we have all used it to some extent. But what about Bluetooth modules in microcontrollers? This article will take you into the world of Bluetooth modules. 1 Introduction to Bluetooth Modules A Bluetooth module is a commonly used wireless communication module, widely applied in various smart devices. … Read more
HC-05 The Bluetooth module BT-HC05 is a high-performance Bluetooth serial module. 1. It can be paired with various smart terminals with Bluetooth capabilities, such as computers, Bluetooth hosts, mobile phones, PDAs, PSPs, etc. 2. It has a wide baud rate range of 4800~1382400 and is compatible with microcontroller systems. 3. After two Bluetooth modules in … Read more