User Manual
HLK-B40
CONTENTS
Terminology&noun interpretation................................................................................................................2
1. Introduction............................................................................................................................................3
2. Pin definition......................................................................................................................................... 4
3. Typical application circuits....................................................................................................................6
4. Basic functional instructions..................................................................................................................7
4.1 The principle of transmission.........................................................................................................7
4.2 Module operating mode (transmission and AT command mode)..................................................8
4.3 Description of the input and output pin functions...........................................................................9
4.4 Bluetooth device roles and connections.........................................................................................9
5.1. Test the debug base plate................................................................................................................. 10
5.2. Quickly verify bluetooth serial transmission................................................................................... 11
6. Low power sleep function....................................................................................................................13
7. AT command.........................................................................................................................................13
7.1 ATinstruction format description......................................................................................................13
7.2 AT instruction list and description....................................................................................................14
