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ماژول بلوتوث سریال HC-05 همراه با برد کمکی با پشتیبانی از پروتکل SPP (Serial Port Protocol) برای ارتباط بیسیم سریال طراحی شده است. تقریباً در تمامی پروژههایی که در آنها نیاز هست که توسط میکروکنترلر اطلاعات بهصورت بلوتوث ارسال شوند از این ماژول استفاده میگردد.
TXD: Send side, generally expressed as their own sender, normal communication RXD must be connected to another device.
RXD: the receiving end, generally expressed as himself on the receiving end, normal communication TXD must be connected to another device. When normal communication itself TXD RXD forever connected device!
Since the resumption of spontaneous: RXD when normal communication access other devices TXD, so if you want to receive data sent by itself as the name suggests, it is their own to receive data transmitted, namely own TXD directly connected to RXD, used to transmit and receive test itself It is normal, is the quickest and easiest way to test when a problem occurs first do this test to determine whether a product failure . Also known as the loopback test.
TTL level: usually represent binary data, the provisions of + 5V is equivalent to a logical "1", 0V is equivalent to a logical "0", known as TTL signal system, is positive logic RS232 level: using -12V to -3V, equivalent to a logical "0", + 3V to + 12V logic level, equivalent to a logical "1" is a negative logic
۱, the core module HC-05 from the module, leads to the interface includes VCC, GND, TXD, RXD, KEY pin, Bluetooth connection status pinout (STATE), not connected to the output low, output high after the connection
۲, led indication Bluetooth connection status, flash means no Bluetooth connectivity, slow flash that enter the AT mode, double flash indicates Bluetooth is connected and turned on port
۳, the floor set up anti-reverse diode with 3.3V LDO, input voltage 3.6 ~ 6V, When unpaired current of about 30mA, paired about 10mA, the input voltage must not exceed 7V!
۴, the interface level 3.3V, can be directly connected to various SCM (51, AVR, PIC, ARM, MSP430, etc.), 5V microcontroller can also be connected directly, without MAX232 MAX232 can not go through!
۵, clearing the effective distance of 10 meters ( power rating of CLASS 2), more than 10 meters are possible, but do not do this to ensure the quality of the connection distance of
۶, after the pair when full-duplex serial port to use, without having to know any Bluetooth protocol, supports 8 data bits, 1 stop bit , you can set the parity communication format, which is the most commonly used communication format does not support other formats.
۷, can be pulled 34 feet into the AT command mode to set parameters and query information
۸, compact (3.57cm * 1.52cm), factory chip production to ensure the placement quality. And sets of transparent heat shrink tubing, dust and beautiful, and there is a certain degree of anti-static capabilities.
۹, can be switched via AT commands as master or slave mode, can be connected via AT command specifies the device
۱۰, supported from the standard baud rates between 4800bps ~ 1382400bps
After pairing only as a fixed baud rate of the serial port can be used in the same, so long as it is "fixed baud, 8 data bits, no parity" communication format serial devices can be directly replace the original wired serial port without the need to modify the program.
Such as data acquisition, intelligent car, serial printers, and other outdoor dot matrix screen control. Paired with a computer: fit between computers via Bluetooth serial communication with the device, use the same serial port paired with your phone: for between your phone via Bluetooth serial communication with the device, use the same serial port paired with a Bluetooth host: for two devices directly via Bluetooth serial communication, such as between the microcontroller and microcontroller serial cable with microchips, etc., use the same serial port
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