Description:
The HM-BT4502 / HM-BT4502A Bluetooth Low Energy (BLE) 5.0 Module is a compact wireless communication module designed for fast and reliable data transfer in IoT, embedded systems, and microcontroller-based projects. Powered by the CMT4502 chip, this BLE module provides a convenient way to add Bluetooth wireless communication to compatible electronic devices without requiring extensive Bluetooth stack programming experience.
Designed for easy integration with MCUs and serial communication systems, the HM-BT4502 uses a universal serial port interface for full-duplex two-way communication. This makes it suitable for applications where a microcontroller needs to exchange data wirelessly with smartphones, computers, sensors, controllers, and other Bluetooth-enabled devices.
The module operates from a 1.8V to 3.6V DC supply and supports a wide operating temperature range of -20°C to +85°C, making it suitable for a variety of embedded and IoT environments. It uses GFSK modulation within the 2.4GHz Bluetooth frequency range of 2402MHz to 2480MHz.
With support for 2M symbol transmission and packet transmission of up to 244 bytes, the HM-BT4502 offers efficient wireless data communication. Its default connection interval of 30 milliseconds enables fast connection performance for responsive applications.
The module also supports AT commands, allowing users to perform functions such as software reset, MAC address retrieval, Bluetooth connection interval configuration, and forwarding-rate control. Its dynamic power adjustment capability provides additional flexibility when configuring wireless communication performance.
Specifications:
| Specification | Details |
|---|---|
| Module Model | HM-BT4502 / HM-BT4502A |
| Item Type | HM Series Module |
| Bluetooth Version | Bluetooth Low Energy 5.0 |
| Main Chip | CMT4502 |
| Operating Voltage | 1.8V–3.6V DC |
| Voltage Rating | 1.8V–3.6V DC |
| Operating Temperature | -20°C to +85°C |
| Modulation Mode | GFSK |
| Frequency Range | 2402MHz–2480MHz |
| TX Power | +8dBm to +20dBm |
| RX Sensitivity | -97dBm |
| Communication Interface | Universal Serial Port |
| Communication Type | Full-Duplex Two-Way Communication |
| Minimum Baud Rate | 9600 bps |
| Default Connection Interval | 30ms |
| Symbol Transmission | 2M |
| Maximum Packet Transmission | 244 Bytes |
| AT Command Support | Yes |
Features:
- Bluetooth Low Energy 5.0: Provides efficient wireless communication for compatible IoT and embedded applications.
- CMT4502 Chip: Uses the CMT4502 chipset for Bluetooth Low Energy wireless data transfer.
- Easy MCU Integration: Designed for convenient connection with microcontrollers through a universal serial interface.
- Full-Duplex Communication: Supports two-way data communication through the serial interface.
- Low-Voltage Operation: Works with a 1.8V–3.6V DC supply for suitable low-voltage electronic systems.
- Fast Connection: Default connection interval of approximately 30ms enables responsive wireless communication.
Applications:
- IoT Projects: Suitable for adding Bluetooth Low Energy wireless communication to IoT devices, smart systems, and connected electronics.
- Arduino & Microcontroller Projects: Can be integrated with compatible MCUs for wireless serial data communication and remote control applications.
- Wireless Sensor Systems: Useful for transferring sensor data wirelessly between embedded devices and Bluetooth-enabled equipment.
- Smart Home Automation: Suitable for wireless communication in home automation controllers, monitoring systems, and smart electronic devices.
- Industrial Automation: Can be used in embedded control systems, wireless monitoring equipment, and automation projects requiring BLE connectivity.
Safety Precautions:
- Verify that the supply voltage is within the specified 1.8V–3.6V DC range before powering the module.
- Do not connect the module directly to a voltage source higher than its rated operating voltage.
- Check the polarity and wiring of the power and serial communication connections before use.
- Ensure that the connected MCU or controller uses compatible voltage levels for the module interface.
- Avoid short-circuiting the power supply or signal pins during installation and testing.
- Do not expose the module to water, excessive moisture, dust, or conductive materials.
- Operate the module within the specified -20°C to +85°C temperature range.
- Avoid excessive physical force, bending, or mechanical stress on the PCB and connection pins.
Frequently Asked Questions ( FAQs )
1. What is the HM-BT4502 Bluetooth BLE module used for?
The HM-BT4502 Bluetooth Low Energy 5.0 Module is designed to add wireless Bluetooth communication to compatible microcontrollers, IoT devices, sensors, robotics projects, and embedded systems. It provides a convenient serial communication interface that allows electronic devices to exchange data wirelessly with compatible Bluetooth-enabled devices. It is particularly useful for projects where developers want to implement BLE communication without designing a complete Bluetooth stack from the beginning.
2. Can the HM-BT4502 be connected directly to an Arduino or microcontroller?
The HM-BT4502 is designed for integration with compatible microcontrollers and MCU-based systems through its universal serial interface. Before connecting it to an Arduino or another controller, users should verify the required supply voltage and ensure that the communication signal levels are compatible. Proper wiring of the power, ground, transmit, and receive connections is important for reliable communication and to prevent damage to the module.
3. What is the operating voltage and temperature range of the HM-BT4502?
The module operates from a 1.8V to 3.6V DC supply and is specified for an operating temperature range of -20°C to +85°C. A stable and regulated power supply should be used during operation. Supplying a voltage above the specified range may damage the Bluetooth module. For reliable performance, the module should also be operated within its specified temperature limits and protected from excessive heat and moisture.
4. Does the HM-BT4502 support AT commands?
Yes, the HM-BT4502 supports AT command configuration and control. AT commands can be used for functions such as software reset and retrieving the Bluetooth MAC address. The module also supports commands for configuring the Bluetooth connection interval and controlling forwarding rates through dynamic power adjustment. This provides developers with additional flexibility when configuring the module for specific wireless communication requirements.
5. What types of projects can use the HM-BT4502 BLE module?
The HM-BT4502 can be used in a wide range of Bluetooth Low Energy and IoT applications, including Arduino projects, wireless sensor systems, robotics, smart home automation, embedded devices, industrial monitoring, and custom electronic products. Its serial communication interface makes it suitable for applications where a microcontroller needs to exchange data wirelessly with a compatible Bluetooth-enabled device. Always confirm the module's voltage, interface, and communication requirements before integrating it into a project.
Package Included:
1X HM-BT4502 Bluetooth Low Energy BLE Pass-Through Module Wireless Communication Module for IoT Projects
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