If you want to enter AT mode
Just hold down the button
Until setup is complete
The following information is not provided, for various reasons, do not "graduate design needs" and ask, do not agree do not buy:
1, the paper manual and CD-ROM
2, the original design documents, including but not limited to SCH documents, PCB files
3, various microcontroller end of the test program
4, other intelligent devices (such as PDA, PSP, mobile phones and other various brands) serial procedures
5, has been described above in addition to other information could be provided outside the
NOTE! ! ! Do not place the power supply to the signal pin, it will directly burn!
The following is not product quality problems, wiring errors are excluded from the warranty will not be returned:
1, since the close of spontaneous test is successful, the use of TXD or RXD cause a short circuit with the ground
2, no power supply module against reverse reverse cause damage to the power supply
1.1 Tips (very important):
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 connect another device.
When normal communication itself TXD RXD forever connected device!
Since the resumption of spontaneous: RXD normal communication access other devices TXD, so if you want to receive data sent by itself as the name suggests, is to receive the data they transmit their own, that is directly connected to its own TXD 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.
1.2 Level Logic:
TTL level: typically binary data representation, + 5V equivalent to a predetermined logical "1", 0V is equivalent to logic "0", the system is called TTL signal is positive logic
RS232 level: using -12V to -3V, is equivalent to a logical "0", + 3V to + 12V logic level, equivalent to a logical "1" is a negative logic
1.3 Product Features:
1, the core module HC-05 from the module, leads to interface includes VCC, GND, TXD, RXD, KEY pin, Bluetooth connection status pinout (STATE), not connected to the output low, after connecting high output
2, led indicating the status of the Bluetooth connection, Bluetooth connectivity means no flash, slow flash that enter the AT mode, double flash indicates Bluetooth is connected and turned on the port
3, bottom set anti-reverse diode with 3.3V LDO, input voltage 3.6 ~ 6V, when the unpaired current of about 30mA, paired about 10mA, the input voltage to prohibit more than 7V!
4, the interface level 3.3V, can be directly connected to various SCM (51, AVR, PIC, ARM, MSP430, etc.), 5V microcontroller can also be directly connected, can not pass without MAX232 MAX232!
5, open to 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
6, after the pair when full-duplex serial interface, without having to know any Bluetooth protocol support 8 data bits, 1 stop bit, parity communication format can be set, which is the most commonly used communication format does not support other formats.
7, can be pulled 34 feet into the AT command mode to set parameters and query information
8, compact (3.57cm * 1.52cm), factory chip production to ensure the placement quality. And set transparent shrink tube, dust and beautiful, and there is a certain anti-static capabilities.
9, can be switched via AT commands as master or slave mode, you can connect to the specified device through AT commands
10, support from among the standard baud rate 4800bps ~ 1382400bps
1.4 Usage:
After pairing just as 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 of serial devices can be directly replace the original wired serial port and You do not need to modify the program. Such as data acquisition, intelligent car, serial printer, outdoor Lattice Screen control.
Paired with a computer: for between computers via Bluetooth serial communication with the device, use the same serial port
Paired with the phone use: 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
Flexible use:
Baud rate conversion, because the receiver and the sender can choose their own baud rate, when a small amount of data can be used as the baud rate conversion device.
2.1 How to connect to the computer Bluetooth module (from mode)
The following order with the computer paired with Bluetooth as an example:
First to pass through the Bluetooth module power, this time led blinking, open "My bluetooth location", click "Search for devices in range"
The system will search for Bluetooth devices, the default device name "linvor" (as modified name was modified name, such as "jiayuanelectron"), double-click or right click and select "Add a Bluetooth device"
Enter a passcode (the default is "1234"),
Click "Next", if the password is correct, the computer and the pass-through module connection is established, if not previously had a Bluetooth serial devices installed, the system will automatically install the driver and generate a virtual serial port
Click Configuration, select the appropriate COM port,
I am here only choose com5, the serial port is connected to the computer after the end of the operation, such as I have here is com5, open the port when the Bluetooth module from the LED will flash into a double flash, then just take the Bluetooth module as is the computer's serial port to fixed baud rate used in the same, except that it is wireless.
