The HC-06 Bluetooth module (widely available on AliExpress, often without a push button) is a streamlined, slave‑only wireless serial data bridge. It is designed for projects where a microcontroller needs to communicate with a smartphone, tablet, or PC – but does not require master mode capabilities. The module is built around the CSR BC417 chip (similar to the HC‑05) but runs simplified firmware that makes it easier to use for beginners. Unlike the HC‑05, the HC‑06 has no push button; instead, it automatically enters AT command mode at a dedicated baud rate (typically 38400) immediately after power‑up. You connect it to any microcontroller (Arduino, ESP8266, PIC, etc.) via UART (TX/RX, VCC, GND) and it acts as a transparent wireless serial pipe – anything sent from the paired device appears on the module's RX pin, and anything sent from the microcontroller's TX goes wirelessly to the paired device.

Typical applications include:

• Smartphone‑controlled LED strips or RGB lights
• Wireless servo / motor control for small robots
• Bluetooth remote for home appliances (relay boards)
• Wireless sensor data display on mobile apps (temperature, humidity, distance)
• Bluetooth‑enabled smart lock or access control system
• Simple wireless debugging / logging from embedded devices
• Battery‑powered IoT sensor nodes (low power in slave mode)

Key specifications:

• Chipset: CSR BC417 (Bluetooth 2.0+EDR, SPP profile)
• Role: Slave only (cannot initiate pairing or act as master)
• Operating voltage: 3.6 V – 6 V (onboard 3.3 V regulator, 5 V tolerant)
• Logic level: 3.3 V (5 V safe input via voltage divider)
• Default baud rate: 9600 bps (data mode), 38400 bps (AT command mode)
• Range: ≈10 meters (Class 2, open field)
• AT command entry: Automatic at 38400 baud after power‑up (no button needed)
• Onboard LED: Red power indicator + blue blink for connection status
• Interface: 4 pins (VCC, GND, TX, RX) – often also KEY/EN pin (less used)
• Default pairing PIN: 1234 (fixed on most HC‑06 modules)

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