HC-05 Bluetooth Module(With button)

Description

The HC-05 Bluetooth Module is a drop-in wireless replacement for serial (UART) communication. It acts as a transparent bridge that swaps out your USB or wired serial link without requiring any changes to your existing code — plug it in, pair it, and your project talks over Bluetooth instead of a cable. That makes it a natural fit for smartphone-controlled RC cars, remote weather stations, wireless debugging, and light industrial telemetry.

Every module is quality-checked before it ships to confirm the Master/Slave firmware responds correctly to AT commands and holds a stable connection at its rated range, so you’re not stuck troubleshooting a bad clone mid-project. It ships on a breakout board with an onboard 3.3V regulator and clearly labeled pins, which helps avoid the most common HC-05 mistake: feeding 5V logic straight into the RXD pin. The module accepts a wide 3.6V–6V supply, but its data lines run at 3.3V logic, so a level shifter (or simple voltage divider) is required when pairing it with 5V boards like an Arduino Uno.

Specifications

Key Applications

• Smartphone-controlled robotics — build an Android/iOS dashboard to drive motors
• Remote data logging — stream sensor data to a PC without long cable runs
• Wireless debugging — monitor serial output from a moving or enclosed robot
• Light industrial automation — wireless bridge for PLC-to-HMI communication

Getting Started

If you’re already comfortable with basic UART communication over a USB-to-TTL converter, this module is the natural next step into wireless. It lets you control a project from across a room or place sensors somewhere a cable simply can’t reach. Setup is intermediate-level — a basic grasp of AT commands is enough to configure the name, pairing code, and baud rate.

Wiring & Safety

⚠ VCC takes 5V, but the RXD pin needs 3.3V logic — use a voltage divider or logic-level converter between a 5V Arduino’s TX pin and the module’s RXD pin.

Package Includes

• 1 x HC-05 Bluetooth Module (Master/Slave Serial Wireless Transceiver) for Arduino/ESP32

Frequently Asked Questions

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