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.
5
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
②: When the module is connected to an MCU with a power supply system of 5V, a 220Ω~1KΩ resistor can be
connected in series to the RX pin end of the module and then to the TX pin of the MCU. The TX pin of the module is
directly connected to the RX pin of the MCU, without connection to the resistor in series. (Note: Users are required to
confirm that the MCU used recognizes the voltage of about 3.0V as high level, otherwise, a 3.3V/5V level conversion
circuit is required.)
Note:
It must be noted that the module can be connected to 3.3V (3.0~3.6V) power supply only, instead of 5V. Direct
connecting to 5V will result in damage to module. 5V power supply must be reduced to 3.3V through LDO before
powering on the module.
Note:
If the power supply of the HC-02 module is controllable (that is, when the MCU works, power supply of HC-02
module is turned off, the serial port of the MCU will be connected to the serial port of the module, resulting in the
abnormal operation of the HC-02 module when it is powered on.), the following hardware isolation circuit shall be
added to the serial port connection of the MCU and the module (the part enclosed by the red dotted line):