HC-06 Bluetooth Module

The HC-06 Bluetooth Module is a compact, cost-effective wireless serial bridge for Arduino, Raspberry Pi, and other microcontroller-based projects. Built on Bluetooth 2.0+EDR with the Serial Port Profile (SPP), it delivers reliable, cable-free UART communication for telemetry, robotics, and home automation. Ideal for both electronics engineers and hobbyists integrating electronics components and modules with minimal overhead.

Key Features & Benefits ✨

• Effortless operation: Simple UART interface and straightforward pairing make integration fast and hassle-free.
• Compact footprint: Slim module fits easily into space-constrained designs and enclosures.
• Robust wireless link: Stable, dependable 2.4 GHz connectivity for uninterrupted data exchange.
• SPP slave mode: Acts as a classic Bluetooth serial device for seamless PC/phone/microcontroller links.

Technical Specifications ⚙️

• Bluetooth protocol: Bluetooth 2.0 + EDR, SPP (Slave)
• Frequency band: 2.4 GHz ISM
• Receiver sensitivity: ≤ −80 dBm
• RF output power: ≤ +4 dBm
• Data rate (air): Asynchronous 2.1 Mbps (typical UART throughput up to ~160 kbps)
• Synchronous link: 1 Mbps / 1 Mbps
• Security: Authentication and encryption
• Operating voltage (VCC): 3.6–5 V (3.6 V recommended)
• Current consumption: ~50 mA (active link, typical)
• Logic levels (UART): 3.3 V TTL (RX is 5 V–tolerant on many breakout boards; verify your module)
• Interface: UART (TXD/RXD, 8-N-1), optional KEY/EN pin on some boards
• Default settings: Name “HC-06”, PIN “1234”, Baud 9600 bps (some firmware variants use 38400 bps)
• Dimensions: 43 × 16 × 7 mm

Pinout & Integration 🔌

• VCC: 3.6–5 V regulated supply
• GND: Common ground with the microcontroller
• TXD: 3.3 V output to MCU RX
• RXD: 3.3 V input from MCU TX (use a level shifter or resistor divider for 5 V MCUs if your board is not 5 V–tolerant)
• KEY/EN (if present): Used to enter AT command/configuration modes on some variants

Typical Applications 🚀

• Wireless data transmission: Cable-free UART links for telemetry, data logging, and sensor networks.
• Robotics: Reliable control channel for mobile robots and CNC/3D printer controllers where space is limited.
• Home automation: Add Bluetooth control to lights, relays, thermostats, and DIY smart modules via smartphone or tablet.
• Prototyping with Arduino/Raspberry Pi: Quick serial bridge for sketches, headless setups, and embedded diagnostics.

Usage Notes & Best Practices 🛠️

• Power integrity: Use a stable supply; add local decoupling (for example, 100 nF + 10 µF) close to VCC/GND.
• Antenna clearance: Keep the PCB antenna edge free from metal and ground planes for optimal range.
• AT configuration: When unpaired, configure name, PIN, and baud rate via AT commands (variant-dependent).
• Level compatibility: The module communicates at 3.3 V logic. Protect RXD if driving from 5 V microcontrollers.

Compatibility 🤝

Works seamlessly with Arduino (UNO, Mega, Nano), Raspberry Pi (via UART), and popular microcontroller platforms (AVR, STM32, PIC). A practical addition to your electronics components toolkit and Bluetooth modules library for prototyping and production.