User's Manual

HC-08 BLUETOOTH UART COMMUNICATION MODULE USER MANUAL
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The master module as long as the connection from the slave module, will remember
the last time the connection from the slave module MAC address. If you want to connect
to the other slave module, you must remove the current memory. The first way is put the
module 18 pin to high level of 200mS, the other way is used the “AT+CLEAR” command.
⑱ SET LED ON/OFF
Set command: AT+LED=x
Query command: AT+LED=?
In this command, x is 0 or 1. When x=0, LED is OFF; when x=1, LED is ON.
If LED is OFF, use this command turned on the LED, must reset the module, LED
will be bright!
⑲ SET Search UUID
Set command: AT+LUUID=xxxx
Query command: AT+LUUID=?
The parameters xxxx must be within the range of 0~F.
Because of the large number of Bluetooth devices, the master (because there is no
screen, it is difficult to manually select) set up search UUID filtering. In this case, only the
same UUID slave module can be searched.
Example:
Send: AT+LUUID= FFF0
Return: OK+LUUID=FFF0
Search UUID modified FFF0 (0xFFF0).
Send: AT+ LUUID =?
Return: OK+LUUID=FFF0
Search UUID is FFF0 (0xFFF0).
⑳ SET Service UUID
Set command: AT+ SUUID=xxxx
Query command: AT+ SUUID=?
The parameters xxxx must be within the range of 0~F.
This service UUID is the basis for the master to find the service, and the
characteristic can be found by finding the service.
Example:
Send: AT+SUUID= FFE0
Return: OK+SUUID=FFE0
Service UUID modified FFE0 (0xFFE0).
Send: AT+ SUUID =?
Return: OK+SUUID=FFE0
Service UUID is FFE0 (0xFFE0).