In recent years, in the IoT short-range wireless interconnection market, with the continuous emergence of breakthrough technologies such as LE Audio, Mesh 2.0 and Channel Sounding, the scope of Bluetooth Low Energy (BLE) ecosystem applications is continuously expanding. It can not only provide more cost-effective solutions for data transmission, device networking and precise positioning, but also significantly improve the user experience of consumers in short-range wireless interaction scenarios.

Schematic diagram of electronic shelf labels using BLE modules

Currently, as one of the mainstream hardware communication units that enables efficient and seamless communication between the digital world and the real world under low bandwidth conditions, BLE modules are widely used in consumer electronics, smart homes, electronic price tags, smart wearable devices, healthcare, building automation, industrial control and asset tracking, thanks to their core advantages such as ultra-low power consumption, fast networking, flexible topology architecture and mature protocol stack design.

HM-BT2204, a high-efficiency short-range wireless interconnection solution

For example, HOPERF's independently developed HM-BT2204 is a low-power, high-performance BLE module that has passed BQB, FCC, CE, IC and SRRC certifications, adopts intelligent interference cancellation technology, optimizes the connection stability of Bluetooth devices, and achieves more reliable wireless connections in complex environments.

The HM-BT2204 is based on a high-performance, low-power Bluetooth BLE 5.2 SoC chip, employing a 32-bit ARM® Cortex®-M33 processor core with a maximum clock speed of 76.8MHz. It integrates 32KB RAM and 512KB FLASH on-chip, embeds a 2.4GHz RF transceiver, and features an integrated antenna, supporting wireless data pass-through functionality. By communicating with an external MCU, it can quickly achieve wireless connection and data communication between BLE slave devices and BLE master devices such as mobile phones and tablets. The external MCU has low resource consumption and a simple development process.

After startup, the HM-BT2204 will automatically broadcast, and mobile phones with specific apps open will scan and connect to it. After successful connection, it can be operated via the BLE protocol. At the same time, external MCUs can also communicate bidirectionally with mobile devices through the serial port of the HM-BT2204, and can also transmit control commands and adjust the communication parameters of the HM-BT2204 via the serial port.

The user data format is defined by the upper-layer application. Mobile devices can write to the HM-BT2204 via an app; the written data will be automatically forwarded to the external MCU via the HM-BT2204's serial port. Simultaneously, upon receiving data packets from the external MCU, the HM-BT2204 will also automatically forward them to the connected mobile device. During this process, developers need to complete the code design for both the external MCU and the mobile device's app.

How does HM-BT2204 create an efficient short-range wireless interconnection network?

Since single-mode Bluetooth Low Energy (BLE) devices can communicate bidirectionally with dual-mode Bluetooth devices, and dual-mode Bluetooth chips have become standard components in modern smartphones and tablets, with such a large user base, everyone can be a communication node in the BLE network, and everyone can access the BLE network at no cost.

For example, in a Bluetooth smart lock integrating the HM-BT2204 , after pairing the lock with a smartphone app, homeowners can remotely control the lock, monitor its status, and share access permissions through the app. Homeowners can also unlock the lock using PIN codes, biometrics (fingerprint, iris, face), distance sensing (RSSI threshold), and app operation. Furthermore, thanks to the multi-mode gateway's compatibility with various communication protocols, homeowners can seamlessly integrate the Bluetooth smart lock into their smart home system, enabling interconnectivity and collaborative control among multiple devices.

BLE Smart Lock Solution Diagram

BLE Mesh smart lighting network that integrates HM-BT2204 , users can achieve fine-grained control over the lighting throughout the house after completing the initial pairing with the Mesh network via a mobile app. This includes features such as grouped control by area (living room lights, bedroom lights), customizable brightness and color temperature adjustment, and preset scene-based lighting schemes such as " reading mode " and " sleep mode ," which can be switched with a single click to meet different usage needs.

BLE Mesh Smart Lighting Network Solution Diagram

It is worth mentioning that the HM-BT2204 not only supports multiple transmission rates such as 2M/1M/500K/125K, which can meet the communication needs of different scenarios such as high speed, low latency and low speed, long distance, but also supports multi-connection function and master-slave mode. When in the role of master, it can maintain the connection of up to 10 Bluetooth slaves at the same time (slave can also connect to multiple masters), making it one of the excellent solutions for building short-range wireless interconnection networks.

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If you are interested in HOPERF's HM-BT2204 low-power Bluetooth module, please scan the QR code above or copy and open the link at the end of this article to apply for a sample. We will be happy to serve you!