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We are Shenzhen Hi-Link Electronic co.,ltd, manufacturer of WIFI module, BT module and AC DC power module for ten years in China.
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HLK-B40 is a kind of Master-Slave serial port transmission Bluetooth module based on BLE5.1
All kinds of devices with serial port can use Bluetooth wireless to send and receive data simply and quickly through this module.
The basic functions and features are as follows:
?Main frequency 48MHz, 32-bit ARM Cortex M3 core
?Fast and stable Bluetooth-serial port transmission,serial port rate up to921600
?Master-to-one Bluetooth, which can be set to host orslave mode,supports binding encryption
?Bluetooth from the machine mode can be connected byup to 20 host devicesat the same time, supporting custom broadcast data
?Based on BLE5.1, it is faster and has a longer transmission distance and canreach 40 to 100 m in an open environment
?Supportslow-power modes,sleep currents of up to6 μAand custom connection and broadcast intervals
?Bluetooth transmit power can be adjusted up to 10dBm and receives up to -95dBm
?Support for OTA Bluetooth wireless upgrade module firmware, wireless configuration module parameters
?The default on-board high-quality ceramic antenna increases the transmission distance and includes an external antenna
?Built-in Watchdog, Long and reliable operation time
?Ultrasmall size 14mm×9.5mm×2mm
?Wide operating voltage 1.8 to 4.2V,typical 3.3V
?Rich output pins (UART, I2C, SPI, up to 15 GPIOs, up to 4 ADCs, up to 6 PWMs) provide flexible and in-depth hardware and software custom development services
![](https://ae04.alicdn.com/kf/Ha6291364c08245a38e162440a550d067c.jpg)
The principle of transmission
HLK-B40 is a cost-effective Master-slave integrated Bluetooth transparent transmission module introduced by Hi-Link, designed to enable only serial user devices to quickly and easily use Bluetooth for wireless transmission, with the help of serial transmission, users do not need to care about complex Bluetooth protocol stack and RFcircuit, just a simple serial port transmission, data can be transmitted directly on the Bluetooth wireless connection.
Transmission is short for transparent transmission, means the role of the module is equivalent to the serial port and Bluetooth connection between the establishment of a transparent transmission pipeline, the user in the serial port issued data will be forwarded to the device connected through Bluetooth, data sent through Bluetooth will also be forwarded to the serial port, the entire process users do not need to care about complex Bluetooth connection how to achieve, HLK-B40 module from beginning to end is only the original data transfer and transmission of data without the user&x27;s convenience and transmission.
The principle schematic of the Bluetooth-serial port transmission function is as follows :
![](https://ae04.alicdn.com/kf/Hee075fd303a64fe5be8a1e010321dc9bw.jpg)
This module can be connected by multiple Bluetooth host devices when acting as a Bluetooth accessor, including other B40 modules as hosts.
Under a multi-to-one connection, the data received from the serial port of the machine module is forwarded via Bluetooth to each connected host device, each Data from connected host devices is also forwarded to the serial port from the machine module.
![](https://ae04.alicdn.com/kf/Hbc3555340a614c6e859612e66946b692A.jpg)
Description of the input and output pin functions
![](https://ae01.alicdn.com/kf/H413c60729b734676b339a3a50df0b505O.png)
![](https://ae01.alicdn.com/kf/Hcbb6ebead1a64af59bd95c6ac353a212N.png)
FAQ
Q1: Are you a factory or trading company?
A1: We are a factory, we can guarantee our price is first-hand and competitive.
Q2: How does your factory do regarding quality control?
A2: All the products will be 100% checked before the shipment.
Q3: When can I get the price?
A3:Usually we quote within 24 hours after we get your inquiry, If qty is more, the price will be better.
Q4: If I could buy a sample ?
A4: Yes,sample is available, we could provide one sample for testing,but the shipping cost will be charged.
Q5: What is the price of shipping?
A5: Depending upon the port of delivery, prices varies.
Q6: How to get the documenmts/datasheets ?
A6: We usually send them by email or online, all the products have related documents and technical supports,the best services will be provided to you.
If you have any more questions, welcome to contact us by email annahlktech.com. enjoy your shopping and looking forward to your business. Thank you very much.