The serial port level of SPP-CA Bluetooth module is 3.3V. If the 5V level is connected, the system needs to add a level conversion chip. Allows your device to send or receive data via Bluetooth technology without having to connect a serial cable to your computer. The control software supports Bluetooth, which can be used with several available options. Bluetooth signals are affected by the surrounding environment, obstacles will have a certain shielding of Bluetooth signals, it is recommended not to install in the metal shell. Since metal can weaken the function of the antenna, it is recommended that you do not pave and align the module under the antenna when laying the module, it is best to hollow it out. TXD: indicates the sending end. It usually indicates the sending end. In normal communication, it must connect to the RXD of another device. RXD: indicates the receiving end. Generally, it indicates the receiving end. In normal communication, it must connect to the TXD of another device. In normal communication, the TXD is connected to the RXD of the device.

Note:The slave can be paired with most smart terminals such as computers and mobile phones with Bluetooth function, but the slave can not be paired with each other;Can be directly connected to a variety of single chip microcomputer, can be directly connected to 5V single chip microcomputer, but not through MAX232. Connection: Led indicates bluetooth connection status.Blinking indicates no bluetooth connection, steady on indicates that bluetooth has been connected and opened the port.Generally, the effective distance of open space is about 10 meters(32.8ft). The base plate is 3.3V LDO, the input voltage is 3.6~6V, the current is about 30mA when not paired, the current is about 10mA after pairing, and the input voltage cannot exceed 7V. The core module uses HC-06 slave module, and the leading interfaces include VCC,GND,TXD and RXD. The LED status output pin is reserved.The MCU can judge whether the Bluetooth is connected by the status of the pin, and the KEY pin is invalid for the slave. Application: The module is small in size, low in power consumption, flexible in use and high in transceiver sensitivity. It is mainly used for wireless data transmission, such as industrial remote control, telemetry, underground positioning, smart home, etc.