User's Manual

User Manual of HC-42 Bluetooth Serial Port Communication Module G
athering information and Carrying Dreams
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http://www.hc01.com
Guangzhou HC Information Technology Co., Ltd
Address: Room 608, No.19, Jiangong Road, Tianhe Science Park, Tianhe District, Guangzhou City, Guangdong Province
Technical customer service QQ: 445253184 Sales hot line: 020-8408-3341
PAGE
8
Note
①
: The Module has an on-board indicator LED2 (near the first pin of the module). The 14-pin
LEDCON of the Module is the control pin of the on-board indication LED2.
When the pin is grounded, the Bluetooth indication LED inside the module is turned off.
When the foot is suspended, the Bluetooth indication LED is turned on.
If low power consumption is turned on in an application, it is required that the 14-pin of the
module shall be suspended to avoid unnecessary current consumption!
Note②: Module indicator lamp output pin, high level output, it can be connected toMCUIO.Itis
required to connect resistors in series when the Module is connected to LED.
Before connecting, the slaver module LED will light for 1 second every 2 seconds. After the
connection, the LED is always on.
Note
③
: Input foot, internal pull-up. When the foot is suspended, it is at a high level, and the module
can enter a sleep state with low power consumption by using AT+SLEEP command. This pin
is connected to low level and can wake up the module. Please refer to the command in the
AT+SLEEP command for operations.
4.2 Embedding mode
No copper can be applied and no wires can be routed under the antenna part of the module, otherwise the signal will be
affected adversely. It is recommended that the bottom plate of the antenna may be hollowed out and the antenna be as close
to the board as possible.
Stamp hole packaging mode is used, and the pin is defined as in Section 4.1.