User Manual
Figure 3 Basic minimum circuit (enables low-power sleep function)
Note:
1. RESET pin can not be suspended, it need to connect 10K drop-down resistance.
2. Metal object blocking will affect Bluetooth signal sending and receiving, use should make the module as
far away from metal objects as possible, PCB design requires modules
No copper can be laid under the antenna section.
4. Basic functional instructions
4.1The 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 RF circuit, 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's convenience and transmission.
The principle schematic of the Bluetooth-serial port transmission function is as follows, see the quick start
guide for the specific test verification method.
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