1-5Pcs HC-05 HC-06 RF Wireless BT Bluetooth-compat Transceiver Master-slave Integration Module HC05/HC06 TTL to UART For Arduino

HC05 compatible version, Ble master-slave integrated module
Little common sense (very important):
TXD: transmitting end,-generally expressed as its own transmitting end, normal communication must be connected to another-RXD of a device.
RXD: receiving end,-generally expressed as its own receiving end, normal communication must be connected to another-the TXD of a device.
Product Features:
The core module uses a HC-05 slave module, and the lead-out interface includes VCC,GND,TXD,RXD,KEY lead | pin, Ble connection state lead-out pin (STATE), unconnected output is low, and connected output is high
led indicates ble connection status, flash indicates no ble connection, slow flash indicates entering AT mode, double flash indicates that ble is connected and the port is opened
The bottom plate is equipped with anti-reverse connection diode with 3.3V LDO, input voltage 3.6~6V, current about 30mA when not paired, and about 10mA, input voltage is forbidden to exceed 7V!
The interface level is 3.3V, which can be directly connected to various single-chip computers (51, AVR, PIC, ARM, MSP430, etc.) ,5V single-chip computers
Can also be directly connected, without MAX232 can not pass MAX232!.
The effective distance in the open area is 10 meters (power class 2), and it is possible to exceed 10 meters, but the connection quality at this distance is not guaranteed.
After pairing, when the full-duplex serial port is used, there is no need to understand any Ble protocol, and it supports 8-bit data bits, 1-bit stop bit, and parity can be set. This is also a commonly used communication format and does not support other formats.
Can set parameters and query information by pulling up 34 feet to enter AT command mode
Small size (3.57cm * 1.52cm), factory patch production, to ensure the quality of the patch. And set of transparent heat shrinkable tube, dustproof and beautiful, and has a certain anti-static ability. Can be switched to master or slave mode by AT command, can be connected to the specified device by AT command
Supports standard baud rates from 4800bps to 1382400bps

Product use:
After pairing, it only needs to be used as a serial port with a fixed baud rate, so as long as it is "fixed baud rate, 8-bit data bits,
No parity "communication format serial devices can directly replace the original wired serial port without the need to modify the program. Such as data acquisition, smart car, serial printer, outdoor dot matrix bar screen control.
Pairing with the computer: suitable for communication between the computer and the device through the Ble serial port, using the same method as the serial port
Pairing with mobile phone: suitable for communication between mobile phone and device through Ble serial port, using the same method as serial port-
Pairing with ble host: suitable for two devices to communicate directly through ble serial port, such as between single chip microcomputer and single chip microcomputer, between wired serial port and single chip microcomputer, etc., using the same method as serial port

HC-06