Bluetooth Serial nsmission Module Wireless Serial Port HC-05/HC-06 with A Master- Bluetooth Expansion Board

Bluetooth Serial nsmiion Module Wirele Serial Port HC-05/HC-06 with A Master- Bluetooth Expansion Board1.1 common sense (very ant):TXD: The sender, generally expreed as its own sender, normal communication must be connected to another device's RXD.RXD: receiving end, which is generally expreed as its own receiving end.Normal communication must be connected to the TXD of another device.In normal communication, its TXD will always be connected to the RXD of the equipment!S-receiving spontaneous: when normal communication RXD to other devices TXD, so if you want to receive their own sent data as the name implies, that is, they receive their own sent data, that is, their own TXD directly connected to RXD, used to test whether their own sending and receiving is normal,

1.2 level logic:TTL level: Usually data is expreed in binary, and it is stipulated that +5V is equivalent to logic "1", and 0V is equivalent to logic "0", which is called TTL signal system, which is positive logicRS232 level: use -12V to -3V, which is equivalent to logic "0", +3V to +12V logic level, which is equivalent to logic "1", which is negative logic

1.3 product characteristics:1. The core module uses hc-05 to lead out interfaces from the module, including VCC, GND, TXD, RXD, key pin and Bluetooth connection status lead out pin (state). The unconnected output is low and the connected output is high2. The LED indicates the Bluetooth connection status. The f indicates that there is no Bluetooth connection, the slow f indicates that the at mode is entered, and the double f indicates that the Bluetooth is connected and the port is opened3. Backplane is equipped with anti-re connection with 3.3V LDO, with input voltage of 3.6~6V. The current is about 30mA when unpaired and about 10mA after pairing, and the input voltage is prohibited from exceeding 7V!4. The interface level is 3.3V, which can be directly connected to all kinds of single chip microcomputer (51, AVR, PIC, arm, MSP430, etc.), and 5V single chip microcomputer can also be directly connected without MAX232 or MAX232!5, open space effective distance of 10 meters (power cla CL 2), more than 10 meters is also poible, but do not guarantee the quality of the connection of this distance6. After pairing, when the full duplex serial port is used, there is no need to understand any Bluetooth protocol. It supports the communication format of 8-bit data bit, 1-bit stop bit and parity check. This is also a common communication format and does not support other formats.7. You can enter the at command mode by pulling up the 34 pin to set s and query information8. Small size (3.57cm*1.52cm), factory patch production, to ensure patch quality. It is also covered with nsparent heat shrinkable tube, which is dustproof and beautiful, and has a certain anti-static ability.9. It can be switched to the master or mode through the at command, and the specified equipment can be connected through the at command10. Support the standard baud rate from 4800bps to 1382400bps

1.4 product use:Pairing only needs to be used as a fixed baud rate of serial port, so as long as it is a "fixed baud rate, 8-bit data bit, no parity" communication format of serial devices can directly rep the wired serial port without modifying the program. Such as data collection, smart cars, serial , outdoor dot-strip screen control.Paired with computer: it is suitable for communication between computer and equipment through Bluetooth serial port, and the use method is the same as serial portPaired with mobile phone: it is suitable for communication between mobile phone and device through Bluetooth serial port. The use method is the same as that of serial portPairing with Bluetooth host: suitable for two devices directly through Bluetooth serial communication, such as between the microcontroller and the microcontroller, wired serial port and microcontroller, etc. , the same way to use the same as serial port

Workaround:Baud rate nsformation, because the receiving and sending side can choose their respective Baud rate, in the small amount of data can be used as a Baud rate nsformation device.