Bluetooth Hc-05 Hc 05 Hc-06 06 Transceiver Rf Wireless Slave Module Rs232 / TTL Compatible board &Original board

This HC-05 Bluetooth module uses the BLE protocol, supports Bluetooth 4.0 and above, and can be connected and controlled via Bluetooth assistant software.

Pairing password: 1234

1.1 Key Basics (Very Important):

- TXD (Transmit): Your device's transmission pin. Connect to the RXD of another device.

- RXD (Receive): Your device's reception pin. Connect to the TXD of another device.

- Loopback Test: Connect your own TXD directly to your RXD. This tests if your device can send and receive data correctly, useful for troubleshooting.

1.2 Level Logic:

- TTL Level: +5V/3.3V = logic '1'; 0V = logic '0' (Positive logic).

- RS232 Level: -12V to -3V = '1'; +3V to +12V = '0' (Negative logic).

1.3 Product Features:

- Core: HC-05 slave module. Pins: VCC, GND, TXD, RXD, KEY, STATE (LOW: unpaired, HIGH: paired).

- LED Status: Fast blink - no connection; Slow blink - AT mode; Double blink - connected.

- Power: 3.6V~6V input (Do not exceed 7V!). Onboard 3.3V LDO and reverse-polarity protection.

- Current: ~30mA (unpaired), ~10mA (paired).

- 3.3V logic level. Can connect directly to 3.3V/5V MCUs (e.g., 51, AVR, PIC, ARM, MSP430). Do not use with MAX232!

- Range: Up to 10m open space (Class 2). Performance beyond not guaranteed.

- Functions as a full-duplex serial port after pairing. Supports 8 data bits, 1 stop bit, optional parity. No other formats.

- Enter AT command mode to configure settings by pulling KEY pin (34) high.

- Compact size (3.57x1.52cm). Factory SMD production. Covered in transparent heat shrink tubing.

- AT commands can set module as Master/Slave and connect to specific devices.

- Standard baud rates from 4800 bps to 1382400 bps.

1.4 Applications:

Use as a wireless replacement for a wired serial port (fixed baud rate, 8N1 format). Ideal for:

- Data acquisition

- Smart cars

- Serial printers

- Controlling LED displays

- Pairing with PC, phone, or another Bluetooth module (Master mode).

Adaptive Use:

Can act as a simple baud rate converter for small data volumes, as sender and receiver can use different baud rates.