BT04-A Bluetooth Module (Compatible with HC-05)
Price in Sri Lanka

The BT04-A Bluetooth Module is a compact and versatile wireless communication board designed for adding Bluetooth connectivity to microcontrollers, embedded systems, robotics, and IoT projects. Based on Bluetooth 4.0 (BLE) technology, this module supports low-power, reliable wireless communication and simple UART (serial) integration.

Ideal for projects using Arduino, ESP32, STM32, Raspberry Pi, and other microcontrollers, the BT04-A allows easy data exchange with smartphones, tablets, and Bluetooth-enabled devices.

Features

• Bluetooth 4.0 (BLE) wireless communication
• UART (TX / RX) serial interface for easy integration
• Low-power consumption (BLE standard)
• Supports AT command configuration
• Compatible with Arduino, ESP32, STM32 and other microcontrollers
• Small, lightweight and breadboard-friendly module
• Easy connection to 3.3V or 5V logic (with appropriate level shifting)
• Simple pairing with Bluetooth devices
• Suitable for remote control and data monitoring

Specifications

• Model: BT04-A Bluetooth Module
• Bluetooth Version: 4.0 (BLE)
• Communication Interface: UART (TX / RX)
• Operating Voltage: Typically 3.3V (use level shifting for 5V microcontrollers)
• Data Rate: Bluetooth LE standard rates
• Configuration: AT commands supported
• Antenna: Onboard antenna
• Protocol: BLE (Bluetooth Low Energy)
• Compatibility: Arduino, ESP32, STM32, Raspberry Pi, BLE-enabled devices

Applications

• Wireless data transmission projects
• Bluetooth-controlled robotics
• IoT sensor monitoring
• Mobile device communication
• Remote control systems
• Bluetooth-enabled embedded systems
• Serial wireless communication replacements