HC-08 4pin Bluetooth Module without Button
HC-08 4pin Bluetooth Module without Button
HC-08 4pin Bluetooth Module without Button
The HC-08 is a compact 4-pin Bluetooth Low Energy (BLE) module designed for wireless communication in embedded systems and IoT applications. Electronics engineers, IoT developers, and hobbyists use this module to add Bluetooth connectivity to microcontroller-based projects without requiring complex wireless protocols. This module solves the challenge of establishing reliable short-range wireless communication in resource-constrained applications where size and power consumption are critical factors.
Product Overview
The HC-08 operates on the Bluetooth 4.0 (BLE) standard, utilizing the 2.4 GHz ISM band for wireless transmission. Unlike its predecessor HC-05, the HC-08 is optimized for low-energy applications, making it ideal for battery-powered devices. The module features a simplified 4-pin interface (VCC, GND, TX, RX) that connects directly to UART ports on Arduino, STM32, PIC, and other microcontrollers. The absence of a pairing button reduces component count and PCB space, allowing for seamless integration into compact designs. Communication occurs through AT commands via serial interface, enabling straightforward configuration and data transmission at baud rates up to 115200.
The HC-08 module incorporates a high-performance Bluetooth chipset with an integrated antenna, delivering transmission range up to 100 meters in open space. The module operates at 3.3V logic levels with typical current consumption of 8-10mA during active transmission and sub-1mA in standby mode. Its pre-programmed firmware supports master and slave modes, allowing flexible network topology configuration. The module automatically handles Bluetooth pairing protocols, reducing firmware complexity on the host microcontroller. Built-in filtering and impedance matching ensure reliable signal integrity across various electromagnetic environments.
Key Specifications
| Specification | Details |
| Product Type | Bluetooth Low Energy (BLE) 4.0 Module |
| Brand | HC (Zhejiang HC Information Technology) |
| 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 |
| Operating Voltage | 3.3V DC |
| Pin Configuration | 4-pin (VCC, GND, TX, RX) |
| Baud Rate | 9600-115200 bps (configurable) |
| Transmission Range | Up to 100 meters (open space) |
| Current Consumption | 8-10mA (active), less than 1mA (standby) |
| Frequency Band | 2.4 GHz ISM band |
Key Features
- Bluetooth 4.0 Low Energy standard with ultra-low power consumption ideal for battery-operated IoT devices and wearables
- Simplified 4-pin UART interface (VCC, GND, TX, RX) enabling direct connection to microcontroller serial ports without additional circuitry
- No pairing button design reduces PCB footprint and component complexity, perfect for space-constrained embedded applications
- Dual-mode operation supporting both master and slave configurations for flexible network topologies in wireless sensor networks
- Pre-programmed firmware with AT command support for easy configuration of baud rate, device name, and communication parameters
- Integrated antenna with impedance matching providing stable 100-meter transmission range in open environments
Applications and Use Cases
- Wearable Health Monitoring Devices: Connect fitness trackers, heart rate monitors, and smartwatches to smartphones via BLE for real-time health data transmission with minimal power drain
- IoT Sensor Networks: Build distributed sensor nodes for environmental monitoring (temperature, humidity, air quality) that communicate wirelessly to a central gateway or cloud platform
- Industrial Asset Tracking: Implement asset tracking systems in warehouses and manufacturing facilities using BLE beacons for location-based inventory management
- Home Automation Control: Create wireless control modules for smart lights, door locks, and appliances that communicate with mobile apps or voice assistants
- Robotics and Autonomous Systems: Enable wireless telemetry and control in autonomous robots, drones, and mobile platforms with real-time data feedback
- Medical Device Integration: Connect portable medical devices like glucose meters, blood pressure monitors, and pulse oximeters to healthcare management systems
How to Use
To integrate the HC-08 module into your project, establish a UART connection between the module's TX and RX pins and your microcontroller's RX and TX pins respectively. Power the module with 3.3V from a regulated supply and ensure proper GND connection. The module enters AT command mode by default, allowing you to configure parameters such as device name (AT+NAME), baud rate (AT+BAUD), and operating mode (AT+ROLE). After configuration, the module automatically enters data mode and broadcasts as a BLE peripheral device discoverable by nearby smartphones and tablets. Use serial communication libraries in Arduino IDE, STM32CubeIDE, or Python to send and receive data through the UART interface.
For reliable operation, implement proper voltage regulation to maintain 3.3V supply stability, as voltage fluctuations can cause communication errors. Add a 10uF capacitor close to the VCC pin to filter power supply noise. If your microcontroller operates at 5V logic levels, use a voltage divider or logic level shifter on the RX pin to protect the module's input. Test the connection using a terminal program like PuTTY or Arduino Serial Monitor by sending AT commands and verifying responses. Once paired with a mobile device, data transmission occurs transparently through the UART interface, making it suitable for real-time applications requiring wireless communication with minimal latency.
Frequently Asked Questions
What is the difference between HC-08 and HC-05 Bluetooth modules?
The HC-08 uses Bluetooth 4.0 (BLE) technology optimized for low-power applications, while HC-05 uses classic Bluetooth 2.1 with higher power consumption. HC-08 is ideal for battery-powered IoT devices requiring extended runtime, whereas HC-05 suits applications needing longer range and higher data throughput. The HC-08 also features a simpler 4-pin interface without a pairing button, reducing component count and PCB complexity.
Can HC-08 communicate with both iOS and Android devices?
Yes, the HC-08 fully supports Bluetooth Low Energy (BLE) standard, which is natively supported by both iOS and Android platforms. You can develop mobile applications using iOS Swift, Objective-C, or Android Java/Kotlin to communicate with the HC-08 module. Ensure your mobile app implements proper BLE scanning, connection, and characteristic read/write procedures according to GATT (Generic Attribute Profile) specifications.
What is the maximum baud rate supported by HC-08?
The HC-08 supports baud rates from 9600 to 115200 bps. The default baud rate is typically 9600 bps. You can change the baud rate using the AT+BAUD command followed by a parameter (1 for 9600, 2 for 19200, 3 for 38400, 4 for 57600, 5 for 115200). Higher baud rates reduce latency but require stable power supply and proper PCB layout to maintain signal integrity.
How do I configure the HC-08 module name and password?
Use AT commands to configure the module. Send AT+NAME=YourDeviceName to set the broadcast name (maximum 20 characters), and AT+PASS=YourPassword to set a 4-digit PIN code. After sending each command, the module responds with OK if successful. These settings persist in the module's non-volatile memory even after power cycling. Remember to exit AT command mode by powering off and on the module to apply changes.
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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