Specifications

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password changing.
AT command must be set from TXD, RXD signal pins, not via Bluetooth
channel. Device sending the AT command can be various types of MCU
(for example, 51, avr, PIC, msp430, arm, etc.).
It can also be a computer sending via serial port (PC serial port connected
to MAX232 or USB serial port).
Specification：
1. core module uses HC-05 slave module, pins include VCC, GND, TXD,
RXD, KEY, Bluetooth state pin (STATE), output low if not connected,
high if connected.
2. LED indicates the connection status of Bluetooth, quick flash means no
connectivity, slow flash means entering AT mode, double flash means
Bluetooth is connected and the port is open.
3. Bottom plate has anti-reverse diode,with 3.3V LDO. Input volt is
3.6~6V; current about 30mA with no pairing, current about 10mA after
pairing. Input volt should be within 7V!
4. Pin level is 3.3V. It can be directly connected with various MCUs (51,
AVR, PIC, ARM, MSP43 etc.) , also 5V MCUs, no need for MAX232
and cannot be connected with MAX232!
5. In open area, effective range is 10m (power level is CLASS 2). It’s
possible to be more than 10m. But the connecting quality cannot be