HC-06 Wireless Bluetooth Module without Baseplate

The HC-06 is a slave-mode Bluetooth serial communication module designed for wireless data transmission between microcontrollers and mobile devices or computers over short-range RF links. Electronics engineers, IoT developers, and embedded systems professionals use this module extensively for building wireless control systems, remote monitoring applications, and mobile-connected embedded projects. It solves the critical challenge of adding wireless connectivity to Arduino, PIC, and ARM-based microcontroller projects without requiring complex RF circuit design or expensive communication protocols.

Product Overview

The HC-06 Wireless Bluetooth Module operates on the Bluetooth 2.0 standard with a Class II transceiver, enabling reliable wireless communication within a 10-20 meter range depending on environmental conditions and antenna orientation. The module communicates via a standard UART serial interface operating at 9600 baud rate by default, making it directly compatible with microcontroller UART pins without requiring level shifters for 5V logic. The baseplate-free design provides a compact form factor ideal for space-constrained embedded applications, while the module maintains full compatibility with standard Bluetooth host devices including Android smartphones, iOS devices, and Windows computers with Bluetooth adapters.

This particular variant without baseplate is engineered for direct integration into custom PCB designs or breadboard prototyping environments, eliminating unnecessary bulk and reducing overall system cost. The module features an onboard antenna for improved RF performance and integrates a complete Bluetooth stack, handling all protocol complexities internally. Power consumption remains minimal at approximately 80mA during active transmission and 8mA in idle mode, making it suitable for battery-powered applications. The slave-only configuration means the module waits for incoming Bluetooth connections from master devices, simplifying the pairing process and reducing firmware complexity for most hobbyist and professional applications.

Key Specifications

Specification	Details
Product Type	Slave Mode Bluetooth Serial Module
Brand	HC Wireless
Origin	Original/Authentic
Warranty	7 days on manufacturing defects
Shipping	1-5 days from Bengaluru
Delivery	7-8 days across India
Support	24/7 via Email and WhatsApp
Bluetooth Standard	Bluetooth 2.0 Class II
Communication Interface	UART Serial (TTL Logic)
Default Baud Rate	9600 bps (Configurable)
Operating Frequency	2.4 GHz ISM Band
Transmission Range	10-20 meters (open space)
Power Supply	3.3V to 6V DC
Current Consumption	80mA (Active), 8mA (Idle)
Module Dimensions	26.9mm x 13mm x 13.5mm
Pin Configuration	6-pin header (VCC, GND, TX, RX, STATE, EN)

Key Features

• Slave-mode operation enables automatic pairing with any Bluetooth master device without complex configuration, reducing development time for wireless projects
• TTL-level UART interface directly compatible with Arduino, Raspberry Pi, and 3.3V microcontroller boards without requiring voltage level conversion
• Configurable baud rate and AT command set allows customization of module name, PIN code, and communication parameters for specific application requirements
• Low power consumption with sleep mode support makes this module ideal for battery-powered IoT devices, wearables, and mobile robotics applications
• Baseplate-free compact design minimizes PCB footprint and system weight, perfect for space-constrained embedded systems and wearable projects
• Onboard antenna with integrated RF matching eliminates need for external antenna design and improves signal stability in typical indoor environments

Applications and Use Cases

• Arduino-based wireless robot control systems where the module receives motor commands from Android mobile applications via Bluetooth serial communication
• Home automation projects integrating smart lighting, fan control, and appliance switching through mobile app interfaces communicating with microcontroller-based relay circuits
• Wireless data logging systems for IoT environmental monitoring where sensors connected to microcontrollers transmit temperature, humidity, and air quality data to smartphones or cloud platforms
• Wearable fitness tracking devices and health monitoring systems that stream biometric data from Arduino-based sensor nodes to companion mobile applications in real-time
• Industrial equipment monitoring and remote diagnostics where embedded systems transmit operational parameters and fault conditions wirelessly to maintenance personnel tablets or computers
• Educational robotics and embedded systems projects where students prototype wireless communication concepts without requiring advanced RF knowledge or expensive development tools

How to Use

To integrate the HC-06 module with your microcontroller project, connect the VCC pin to 3.3V or 5V power supply (depending on your module variant), GND to ground reference, TX pin to your microcontroller's RX pin, and RX pin to your microcontroller's TX pin through a voltage divider if using 5V logic. The STATE pin indicates connection status (high when connected, low when disconnected) and can be monitored by your firmware to trigger specific actions. Program your microcontroller to communicate via UART at 9600 baud rate, sending and receiving serial data that the HC-06 automatically transmits and receives over the Bluetooth wireless link. On the mobile device side, download a Bluetooth terminal application, pair with the HC-06 module using the default PIN (typically 1234 or 0000), and establish a serial connection to send commands and receive data from your embedded system.

For advanced customization, you can send AT commands to the module by connecting it in AT command mode (pull EN pin high during power-up). Common AT commands include AT+NAME to change the module name visible during Bluetooth discovery, AT+PSWD to set a custom pairing PIN, and AT+BAUD to modify the serial communication speed. Always ensure proper power supply voltage and current capacity, as inadequate power can cause intermittent connection drops or module malfunction. Test your connections using a serial monitor before deploying in production, and implement error handling in your firmware to gracefully manage Bluetooth disconnections and reconnections.

Frequently Asked Questions

What is the difference between HC-05 and HC-06 modules?

The HC-05 module operates in both master and slave modes, allowing it to initiate Bluetooth connections to other devices, while the HC-06 functions exclusively in slave mode and can only accept incoming connections. The HC-06 is simpler to implement, consumes less power, and is ideal for most IoT and embedded projects where the mobile device or computer initiates the connection. Choose HC-05 only if your project requires the microcontroller to actively discover and connect to other Bluetooth devices.

Can I use HC-06 with 5V Arduino boards directly?

The HC-06 RX pin is 3.3V logic level, so connecting a 5V Arduino TX pin directly can damage the module over time. Use a voltage divider (two resistors: 1K and 2K) on the Arduino TX line to reduce the voltage to approximately 3.3V before connecting to HC-06 RX. The HC-06 TX pin can safely connect to Arduino RX pin as it outputs 3.3V logic which Arduino recognizes as HIGH. Always verify your specific module's voltage specifications before connection.

How do I change the HC-06 module name and PIN code?

Connect the module to a serial terminal at 9600 baud and send AT commands: AT+NAME=YourModuleName to change the Bluetooth device name visible during pairing, and AT+PSWD=1234 to set a custom 4-digit PIN code. Note that some modules require the EN pin to be pulled high to enter AT command mode. After sending AT commands, the module responds with OK if successful. Changes take effect after module restart.

What is the maximum transmission range of HC-06?

The HC-06 Class II module has a nominal range of 10-20 meters in open space with clear line-of-sight. Actual range depends on environmental factors including obstacles, metal shielding, RF interference from Wi-Fi and microwave devices, antenna orientation, and power supply quality. Indoor range typically reduces to 5-15 meters due to wall attenuation. For extended range applications, consider upgrading to Class I modules with external antennas.

When will I receive my order?

Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.

What is your return and warranty policy?

We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.

Are bulk discounts available?

Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.

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• Returns: 7-day return policy on manufacturing defects only

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