User's Manual

User Manual of HC-02 V1.1 Bluetooth Serial Port Communication Module Gathering information and Carrying Dreams
Website: http://www.hc01.com
Guangzhou Huicheng Information Technology Co., Ltd.
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Sales hot line: 020-8408-3341
Address: Room 608, No.19, Jiangong Road, Tianhe Software Park, Tianhe District, Guangzhou City, Guangdong Province Technical customer service: 445253184
4.4 Reference connection circuit
4.4.1 The module is connected to the 5V single-chip microcomputer system and requires level conversion ( if the
MCU works at 5V and the UART RXD inputs a voltage above 3.0V to recognize a high level, a level conversion
circuit needs to be added; If the voltage above 2.0V is input to the UART RXD, it will be recognized as high level,
and no level conversion circuit is required ), please refer to the following wiring method:
4.4.2 When the module is connected to 3.3V single-chip computer system, serial port shall be cross-connected ( when
the module is connected to 5V MCU system and level conversion is not required, please connect 1K resistors in series
before cross - connecting ):