5pcs Bluetooth module wireless bluetooth serial communication module HC-05

1.PCB size: 37.3mm (length) * 15.5mm (width) 2. Weight: 3.5g3. Input voltage: 3.6V - 6V, prohibit more than 7V4. Power reverse, then reverse module jobs 2. 6 feet: EN / VCC / GND / RXD / TXD / STATE (Bluetooth status pin, not connected to the output low, connected to the output high) 3. With the connection status indicator, LED flash means no Bluetooth connection; LED slow flash to enter the AT command mode 4. Onboard 3.3V regulator chip, the input voltage DC 3.6V-6V; unpaired, the current is about 30mA (due to LED flashing, the current is in a state of change); matching success, the current is about 10mA8. Interface level 3.3V , Can be directly connected to a variety of single-chip (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! 5. Effective transmission distance of 10 meters, more than 10 meters is also possible, but do not guarantee the quality of the connection 10. After the success of matching, can be used as a full-duplex serial port. No need to understand any Bluetooth protocol, but only supports 8-bit data bits, 1 stop bit, no parity communication format. This is also the most commonly used communication format, does not support other formats! 6. Press the button to power the Bluetooth module can enter the AT mode, set the parameters and query information 12. AT commands can be switched through the host and slave mode