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HC06 HC-06 Bluetooth Module

K-TECHNICS
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KSh600.00

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The HC-06 Bluetooth module is a popular, low-cost electronic component used to add wireless serial communication to microcontrollers like Arduino, Raspberry Pi, and PIC. It operates exclusively as a slave device, meaning it can accept wireless connections from other devices (like a smartphone or laptop) but cannot initiate connections itself. 
Key Specifications
  • Protocol: Bluetooth V2.0 + EDR (Enhanced Data Rate)
  • Frequency: 2.4 GHz ISM band
  • Operating Voltage: 3.6V to 6V DC (on the VCC pin of most breakout boards)
  • Logic Level: 3.3V TTL (requires a voltage divider when connecting to 5V Arduino RX pins)
  • Default Baud Rate: 9600 bps
  • Default Pairing Code: 1234 or 0000 
Pin Configuration
  • VCC: Power supply input (typically 3.6V - 6V).
  • GND: Ground reference.
  • TXD: Serial transmit pin (connects to the microcontroller's RX pin).
  • RXD: Serial receive pin (connects to the microcontroller's TX pin; requires 3.3V logic level shifting).
Basic Configuration via AT Commands
To change settings like the device name, baud rate, or pairing password, you must enter AT mode. Unlike the HC-05, the HC-06 enters AT mode automatically when it is powered on and not paired with any Bluetooth device (the onboard LED will blink rapidly). 
Connect the module to a USB-to-TTL serial adapter or an Arduino, open a serial monitor at 9600 baud, and send these commands (note that the HC-06 usually does not require a newline/carriage return after the command): 
  • Test Communication: Send AT → Module responds with OK
  • Change Name: Send AT+NAMEmy_device → Responds with OKsetname
  • Change Password: Send AT+PIN5678 → Responds with OKsetpin
  • Change Baud Rate: Send AT+BAUD4 (where 4 represents 9600, 8 represents 115200, etc.) → Responds with OK9600
Important Connection Warning
While the VCC pin can handle 5V, the RXD data pin can only handle 3.3V. If you are connecting it to a 5V microcontroller like an Arduino Uno, you must use a simple voltage divider (e.g., a 1 kΩ and a 2 kΩ resistor) between the Arduino TX pin and the HC-06 RXD pin to avoid damaging the module. 

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