Seeed Studio Studio HM-BT4502 Bluetooth Low Energy (BLE) 5.0 Pass-through Module
Seeed Studio Studio HM-BT4502 Bluetooth Low Energy (BLE) 5.0 Pass-through Module - Image 2
Seeed Studio Studio HM-BT4502 Bluetooth Low Energy (BLE) 5.0 Pass-through Module - Image 3
Seeed Studio Studio HM-BT4502 Bluetooth Low Energy (BLE) 5.0 Pass-through Module - Image 4
SKU: IOWC-0170
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Seeed Studio Studio HM-BT4502 Bluetooth Low Energy (BLE) 5.0 Pass-through Module

₹579.00 (Inclusive of all taxes)
Out of Stock

The Seeed Studio Studio HM-BT4502 is a Bluetooth Low Energy 5.0 serial pass-through module based on the CMT4502 chip, enabling full-duplex wireless data communication between MCUs and smartphones via simple AT command configuration.

Features

  • Bluetooth 5.0 BLE module with CMT4502 chipset for reliable, low-power wireless serial communication.
  • Universal UART interface supports full-duplex data pass-through with a minimum baud rate of 9600 bps.
  • Configurable via AT commands for software reset, MAC address retrieval, connection interval, and Tx power adjustment.
  • Low power consumption with less than 8mA transmit current and under 4µA in deep sleep mode.
  • Supports 2M symbol rate and 244-byte packet transmission for efficient data throughput.

Out of stock

Description

The HM-BT4502 from Seeed Studio Studio is a dedicated Bluetooth Low Energy 5.0 serial pass-through module designed to simplify wireless connectivity for embedded systems. Built around the CMT4502 RF chip, it provides a robust, transparent serial link between a host microcontroller and any BLE-capable device, such as a smartphone or tablet, requiring minimal firmware development effort.

Operating from 1.8V to 3.6V, the module is optimized for battery-powered IoT applications, featuring configurable transmit power from -20dBm to +8dBm and a receiver sensitivity of -97dBm for reliable communication range. Its comprehensive AT command set allows developers to dynamically adjust connection parameters, customize advertisement data, and manage power states without complex BLE stack programming.

Key Features

  • Bluetooth 5.0 BLE compliance with support for 2M PHY and long-range coded PHY for enhanced data rate and range.
  • Universal serial pass-through design enables seamless, full-duplex data exchange between MCU UART and connected BLE devices.
  • Extensive AT command library for easy configuration of module parameters, including device name, MAC address, connection interval, and Tx power.
  • Ultra-low power architecture with deep sleep currents under 4µA, ideal for always-on, battery-operated sensor nodes.
  • Industrial-grade operating temperature range from -40°C to 125°C ensures reliability in harsh environments.
  • Compact form factor with integrated antenna for easy integration into space-constrained designs.

Applications

  • Wireless sensor data logging and telemetry from MCUs to mobile apps or gateways.
  • BLE-enabled configuration interfaces for industrial equipment and smart home devices.
  • Battery-powered asset trackers and beacons for indoor location services.
  • Wireless serial cable replacement for debugging, programming, or data transfer.
  • IoT edge node connectivity in health monitors, wearables, and portable instruments.

Technical Specifications

Wireless ProtocolBluetooth Low Energy (BLE) 5.0
Chipset/SoCCMT4502
Frequency Range2402 MHz - 2480 MHz
ModulationGFSK (Gaussian Frequency Shift Keying)
RF Transmit Power-20 dBm to +8 dBm (adjustable)
Receiver Sensitivity-97 dBm
Supply Voltage1.8 V - 3.6 V
Operating Current (Tx)< 8 mA @ 3V, 0 dBm
Sleep Current< 4 µA @ 3V (low power mode)
InterfaceUART (Serial)
Default Baud Rate9600 bps (minimum)
AntennaIntegrated PCB Antenna
Operating Temperature-40°C to +125°C
DimensionsApprox. 5 x 5 cm (module)

Frequently Asked Questions

How do I configure the HM-BT4502 module using AT commands?

Connect the module's UART TX/RX pins to your MCU's serial port at 9600 bps default baud rate. Send AT commands like 'AT' for acknowledgment, 'AT+RESET' for software reboot, or 'AT+MAC?' to retrieve the Bluetooth MAC address. Ensure commands are terminated with a carriage return (\r\n). Full command sets for power, connection interval, and advertisement data are detailed in the Seeed Studio Studio wiki.

What is the power supply requirement and how do I achieve the lowest sleep current?

The module operates from 1.8V to 3.6V DC. For lowest power consumption, ensure your design provides a clean, regulated supply within this range. To enter deep sleep (under 4µA), configure the module via AT commands to disable advertising and connections, or use the hardware sleep pin if available. Always measure current draw in your final circuit, as external pull-ups or LEDs can significantly increase idle consumption.

Can I change the default serial baud rate and connection parameters of this BLE module?

Yes, the HM-BT4502 supports AT commands to adjust the UART baud rate from its minimum of 9600 bps to higher values for faster data throughput. You can also modify the Bluetooth connection interval (default 30ms) for faster data exchange or lower power, and adjust transmit power from -20dBm to +8dBm to optimize range versus battery life. These settings are stored in non-volatile memory.

Package Includes

  • 1 x HM-BT4502 Bluetooth Low Energy (BLE) Pass-through Module

Additional Information

Weight 0.03 kg
Dimensions 5 × 5 cm

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