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HC05 HC-05 Bluetooth Module

K-TECHNICS
In stock
KSh650.00

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The HC-05 is a highly popular, low-cost Bluetooth Classic (2.0) module designed for wireless serial communication in microcontroller projects. It operates as a Master or Slave device, making it ideal for connecting microcontrollers like Arduino to smartphones, laptops, or other Bluetooth modules. 
Core Technical Specifications
Parameter  Specification
Protocol Bluetooth V2.0 + EDR (Enhanced Data Rate)
Frequency 2.4 GHz ISM Band
Modulation GFSK (Gaussian Frequency Shift Keying)
Emission Power ≤ 4 dBm, Class 2
Sensitivity ≤ -84 dBm at 0.1% BER
Speed Asynchronous: 2.1 Mbps (Max) / 160 Kbps
Default Baud Rate 9600 (Data Mode) / 38400 (AT Command Mode)
Operating Voltage 3.6 V to 6 V (Board) / 3.3 V (Logic Level)
Pinout Configuration
The module is typically mounted on a breakout board with 6 pins: 
  • VCC: Power supply input (3.6 V - 6 V).
  • GND: Ground reference connection.
  • TXD: Serial transmit pin (3.3 V logic) connects to MCU RX.
  • RXD: Serial receive pin (3.3 V logic) connects to MCU TX (requires voltage divider).
  • STATE: Indicates Bluetooth connection status (Low = disconnected, High = connected).
  • EN / KEY: Toggle pin to enter AT Command mode (High = AT mode, Low/Floating = Data mode). 
Connecting HC-05 to Arduino
When wiring the HC-05 to a 5 V Arduino, you must use a voltage divider on the HC-05 RXD pin because its logic level is strictly 3.3 V. 
text
Arduino 5V  ------------------------> VCC (HC-05)
Arduino GND ------------------------> GND (HC-05)
Arduino TX (Pin 11) ---> [ 1kΩ ] ---> RXD (HC-05)

                               |
                            [ 2kΩ ]
                               |
                              GND
Arduino RX (Pin 10) <---------------- TXD (HC-05)

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