The HC-05 is a Bluetooth SPP (Serial Port Protocol) module designed for wireless serial communication. It’s widely used in embedded systems and microcontroller-based projects for enabling Bluetooth connectivity between devices.
📦 Key Features:
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Bluetooth Version: 2.0+EDR (Enhanced Data Rate)
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Operating Voltage: 3.3V (but often used with 5V via level shifter or voltage divider)
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Communication: UART (TX, RX)
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Baud Rate: Default 9600 (configurable from 9600 to 1382400)
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Range: ~10 meters (open space)
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Modes: Master and Slave (configurable via AT commands)
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Built-in LED: Indicates connection status (flashing = not connected, steady = connected)
⚙️ Pins Overview:
Pin | Function |
---|---|
VCC | Power Supply (3.3V–5V input depending on module) |
GND | Ground |
TXD | Transmit Data |
RXD | Receive Data |
EN/KEY | Mode selection (for AT command mode) |
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