HLK-B40 BLE 5.1 Module – Long-Range, Low-Power Bluetooth Communication for Embedded Systems.
The HLK-B40 Bluetooth Module is a versatile BLE 5.1 solution designed for high-performance wireless serial communication. Developed by Hi-Link, it supports master-slave switching and enables a wide range of embedded applications from smart devices to industrial automation.
Powered by a 32-bit ARM Cortex-M3 processor clocked at 48MHz, the HLK-B40 supports serial data rates of up to 921600bps, ensuring stable and fast transmission. Designed for BLE 5.1, the module offers enhanced speed and extended range (up to 100 meters in open environments), outperforming earlier Bluetooth versions.
In slave mode, it can be connected to up to 20 hosts simultaneously, making it ideal for complex networking and broadcast systems. It also supports custom broadcast data, OTA firmware upgrades, and wireless parameter configuration — streamlining development and deployment.
Engineered for low-power operation, it consumes as little as 6μA in sleep mode, with adjustable transmit power up to 10dBm and excellent receive sensitivity (-95dBm). The module includes a ceramic onboard antenna and provisions for an external antenna to maximize range.
With a tiny footprint of 14mm × 9.5mm, wide voltage range (1.8V–4.2V), and rich I/O interface (UART, I2C, SPI, up to 15 GPIOs), the HLK-B40 fits perfectly into space-constrained embedded systems requiring robust wireless communication.
Upgrade your wireless interface with HLK-B40 — Buy now and simplify your serial communication!
Key Features:HLK-B40 Bluetooth 5.1 Module
✔ BLE 5.1 master-slave support with long range (40–100m)
✔ 32-bit ARM Cortex-M3 @ 48MHz
✔ Baud rate up to 921600bps for fast serial transfer
✔ Simultaneous connection to 20 host devices in slave mode
✔ OTA firmware upgrade and wireless parameter config
✔ Adjustable transmit power (up to 10dBm), receive sensitivity -95dBm
✔ Ultra-low power: sleep current as low as 6μA
✔ Built-in Watchdog for long and reliable uptime
✔ Onboard ceramic antenna + external antenna support
✔ Ultra-compact size: 14mm × 9.5mm × 2mm
✔ Wide voltage support: 1.8V to 4.2V (3.3V typical)
✔ Rich I/O: UART, I2C, SPI, up to 15 GPIOs, 4 ADCs, 6 PWMs
Specifications:HLK-B40 Bluetooth 5.1 Module
- • Processor: ARM Cortex-M3 @ 48MHz
- • Bluetooth Version: BLE 5.1
- • Transmission Range: 40–100m (open field)
- • Max Baud Rate: 921600bps
- • Transmit Power: Up to 10dBm
- • Receive Sensitivity: -95dBm
- • Power Supply: 1.8V to 4.2V (typ. 3.3V)
- • Power Consumption: Sleep current as low as 6μA
- • OTA Support: Yes
- • Firmware Update: Wireless (OTA)
- • Antenna: Onboard ceramic + external
- • I/O Ports: UART, I2C, SPI, up to 15 GPIOs, 4 ADCs, 6 PWMs
- • Size: 14mm × 9.5mm × 2mm
Package Includes:HLK-B40 Bluetooth 5.1 Module
✔ 1x HLK-B40 Bluetooth 5.1 Module
✔ 1x Product Datasheet
✔ 1x Quality Assurance Card
Use Cases:
• Wireless MCU Serial Interface
• IoT Gateways & Smart Devices
• Industrial Sensor Networks
• BLE Broadcasting Systems
• Embedded Product Prototyping
FAQs:
1. What is the HLK-B40 used for?
It's used for wireless serial communication between microcontrollers or embedded systems via Bluetooth 5.1.
2. Can it connect to multiple devices simultaneously?
Yes, in slave mode, it can connect to up to 20 Bluetooth hosts.
3. Is it suitable for long-range Bluetooth applications?
Yes, it supports up to 100 meters range in open field conditions.
4. Does it support OTA firmware updates?
Yes, the HLK-B40 supports wireless firmware updates over Bluetooth.
5. How power-efficient is the module?
It supports ultra-low power operation with sleep current as low as 6μA.
