The HC-05 Bluetooth module is an easy-to-use transceiver. The modems is design to work as a serial (RX/TX) data pipe, and are a grest replacement for serial cables. Product parameters: The core module uses the HC-05 slave module, and the outgoing interface includes VCC, GND, TXD, RXD, KEY pins, Bluetooth connection status pins (STATE), the output is low when not connected, and the output is high after connection LED indicates bluetooth connection status, fast flashing means no bluetooth connection, slow flashing means entering AT mode, double flashing means bluetooth is connected and the port is open The bottom plate is equipped with anti-reverse diode, with 3.3V LDO, the input voltage is 3.6~6V, the current is about 30mA when not paired, and about 10mA after pairing, the input voltage is prohibited to exceed 7V The interface level is 3.3V, which can be directly connected to various microcontrollers (51, AVR, PIC, ARM, MSP430, etc.), and 5V microcontrollers can also be directly connected, without MAX232 or through MAX232 The effective distance in open space is 10 meters (power level is CLASS 2), and it is possible to exceed 10 meters, but the connection quality of this distance is not guaranteed After pairing, it can be used as a full-duplex serial port without knowing any bluetooth protocol. It supports 8 data bits, 1 stop bit, and a communication format that can be set to parity. This is also the most commonly used communication format and does not support other formats. You can enter the AT command mode by pulling up pin 34 to set parameters and query information It can be switched to master or slave mode through AT commands, and can be connected to specified devices through AT commands Supports standard baud rates from 4800bps to 1382400bps Kind tips: The supply voltage must be 5V, not 3.3V Do not connect the pins of the power cable to the data cable, please confirm carefully before wiring LED must enter slow flashing mode before AT command test can be performed After each AT command is input, you must press the Enter key to send it If you cannot return OK, please exchange RXD and TXD Do not tear off the heat shrinkable tube or weld it by yourself, otherwise it will be regarded as a waiver of the warranty and return service It is not possible to use the RXD and TXD on the UNO to connect the Bluetooth module for AT command test
