VCC: positive power supply GND: power supply is negative RXD: the receiver, Bluetooth module receives from another device sent data; normally connected to other devices transmitting end TXD TXD: sending end, the Bluetooth module to send data to other devices; receiving terminal is normally connected to other devices RXD Size: 37.5 mm * 16.5 mm * 4 mm(L * W * H) Description:
Wiring methods:
EN: Enable, then you need to enter the AT mode 3.3V
Module Parameters:
Size: 37.5mm * 16.5mm * 4mm(L * W * H)
Input voltage: 3.6V - 6V.
Leads to 6 feet: EN / VCC / GND / RXD / TXD / STATE (Bluetooth status leads to the foot, is not connected to the output low, after connecting output high)
With the connection status indicator, LED flash means no Bluetooth connection; LED slow flash indicates enter AT command mode
Onboard 3.3V regulator chip, the input voltage DC 3.6V-6V; when unpaired, current of about 30mA (because LED lights flashing, the current state of change);
pairing is successful, the current is about 10mA
Interface level 3.3V, you can directly connect a variety of microcontroller (Arduino / 51 / AVR / PIC / ARM / MSP430 etc.), 5V microcontroller can also be directly connected.
Directly connected to the microcontroller serial port, not through the MAX232 chip!
Open area effective transmission distance of 10 meters.
After the pairing is successful, can be used as a full-duplex serial interfaces. Without knowing any of the Bluetooth protocol, but only supports 8 data bits, 1 stop bit, no parity
communication format.
You can switch between Receiver and Transmitter mode via AT commands
Modules default baud rate is 9600, the default passkey is 1234, the default name for the HC-05

Package Content: 1 pcs HC-05 Wireless Bluetooth Module