This is the Blue variant of the HC-05 4pin Bluetooth Module(Master/Slave) with Button in Bluetooth and NRF Modules. Available at ₹597.08 (₹506.00 + GST) with free shipping across India.
Looking for Hc-05 Module? HC-05 4pin Bluetooth Module(Master/Slave) with Button is available at Zbotic with fast shipping across India.
HC-05 4pin Bluetooth Module(Master/Slave) with Button
Description:
The HC-05 4 Pin Wireless Serial Bluetooth Module is a device that enables wireless communication between a microcontroller and other Bluetooth-enabled devices. It uses the UART protocol, which simplifies the process of sending and receiving data over the air.
The HC-05 4pin Bluetooth Module (Master/Slave) with Button can function as either a master or a slave device, meaning that it can initiate or accept connections from other Bluetooth devices. For example, it can connect to most phones and computers with Bluetooth, as well as to other slave devices such as keyboards and other HC-06 modules. However, to connect to another slave device, a master device is required.
Pin Description:
| SN | PIN | Description |
| 1 | RXD | Receive Serial Data. Every serial data given to this pin will be broadcasted via Bluetooth. |
| 2 | TXD | Transmits Serial Data. Everything received via Bluetooth will be given out by this pin as serial data. |
| 3 | VCC | Powers the module. Connect to 5V Supply voltage |
| 4 | GND | Ground pin of module, connect to system ground. |
| 5 | LED | Indicates the status of Module Blink once in 2 sec: Module has entered Command Mode Repeated Blinking: Waiting for connection in Data Mode Blink twice in 1 sec: Connection successful in Data Mode |
| 6 | Button | Used to control the Key/Enable pin to toggle between Data and command Mode |
HC-05 Default Settings:
- Default Bluetooth Name: “HC-05”
- Default Password: 1234 or 0000
- Default Communication: Slave
- Default Mode: Data Mode
- Data Mode Baud Rate: 9600, 8, N, 1
- Command Mode Baud Rate: 38400, 8, N, 1
Applications:
- Embedded Projects.
- Industrial Applications.
- Computer and Portable Devices.
- GPS receiver.
Features:
- Working current: matching for 30 mA, matching the communication for 8 mA.
- Dormancy current: no dormancy.
- Used for a GPS navigation system, water, and electricity gas meter reading system.
- With the computer and Bluetooth adapter, PDA, seamless connection equipment.
- Bluetooth module HC-08 Master and slave Two in one module.
- Use the CSR mainstream Bluetooth chip, Bluetooth V2.0 protocol standards.
- Potter default rate of 9600, the user can be set up.
- Bluetooth protocol: Bluetooth Specification v2.0 EDR
- Speed: Asynchronous: 2.1Mbps(Max) / 160 kbps, Synchronous: 1Mbps/1Mbps.
- Security: Authentication and encryption.
- Profiles: Bluetooth serial port.
Tutorial:
Package Includes:
1 x HC-05 4pin Bluetooth Module(Master Slave) with Button
HC-05 4pin Bluetooth Module(Master/Slave) with Button Overview
The HC-05 4pin Bluetooth Module(Master/Slave) with Button is a UART-based wireless transceiver that lets microcontrollers and embedded systems communicate over Bluetooth v2.0+EDR. Featuring a built-in button for toggling between master and slave modes, it’s ideal for creating serial links with phones, computers, other HC-05/HC-06 modules, or Bluetooth peripherals.
Key Features of HC-05 4pin Bluetooth Module(Master/Slave) with Button
- Bluetooth Specification v2.0+EDR with GFSK modulation for reliable 2.4 GHz wireless communication
- Adjustable emission power ≤4 dBm (Class 2) and sensitivity down to –84 dBm at 0.1% BER
- On-board push button to switch between master and slave roles on startup
- Standard 4-pin interface (VCC, GND, TXD, RXD) for easy UART integration
- Seamless pairing with smartphones, PCs, Bluetooth keyboards, and other HC-06 modules
- Genuine product with fast shipping from Zbotic across India
Applications and Use Cases
- Wireless serial communication between Arduino / ESP8266 and mobile apps for data display
- Bluetooth remote control for robotic platforms or motor drivers
- Sensor data logging to Bluetooth-enabled PCs and tablets
- Home automation link between microcontroller-based controllers and smartphones
- Wirelessly transmit commands to Bluetooth-enabled LED matrices or displays
How to Use HC-05 4pin Bluetooth Module(Master/Slave) with Button
Power the module with 5 V on VCC (on-board regulator) and GND, then connect TXD/RXD to your microcontroller’s RX/TX pins. Hold the push button while powering up to select master mode, release to enter slave mode. Configure baud rate and name via AT commands over UART, then pair with your target device using the default PIN (1234) or a custom code.
Why Buy from Zbotic?
- Genuine Products: All items sourced from authorized distributors
- Fast Shipping: Orders ship within 24 hours with tracking (non backordered products)
- Free Shipping: Free delivery on qualifying orders
- COD Available: Cash on Delivery, UPI, cards, net banking
- Technical Support: Expert help for setup and troubleshooting
- Easy Returns: Hassle-free replacement for defective products
Frequently Asked Questions
How do I switch the HC-05 between master and slave modes?
Hold down the onboard button while powering the module. If the LED blinks slowly, it’s in master mode; blinking fast indicates slave mode. Release the button before normal operation.
What are the default UART settings for this HC-05 module?
By default, the module communicates at 9600 bps, 8 data bits, no parity, 1 stop bit (8N1). You can change these settings using AT commands in command mode.
Can I pair this HC-05 with another HC-06 module?
Yes. Set the HC-05 to master mode via the button and the HC-06 to slave mode. Use AT commands to set the HC-05’s remote address, then initiate pairing and connection.
Arduino PID Controller: Precise Motor and Temperature Control
An Arduino PID controller is one of the most powerful techniques you can add to your embedded projects....
Read More →
Arduino Multiplexer CD4051: Expand Analog Inputs
Table of ContentsIntroductionComponents and Hardware SetupWiring Diagram and ConnectionsComplete Code with ExplanationCustomization and ImprovementsTroubleshooting Common IssuesAdvanced Features and...
Read More →
Arduino Metal Detector: Build a Treasure Finder
Table of ContentsIntroductionComponents and Hardware SetupWiring Diagram and ConnectionsComplete Code with ExplanationCustomization and ImprovementsTroubleshooting Common IssuesAdvanced Features and...
Read More →Technical Specifications
| Model | HC-05 |
|---|---|
| Pin Count | 4-pin |
| Interface / Protocol | Bluetooth |
| Color | Blue |
| SKU | AI2481 |
| Weight | 0.00455 kg |
| Availability | Out of Stock |
Applications & Use Cases
The HC-05 4pin Bluetooth Module(Master/Slave) with Button is a versatile bluetooth and nrf modules used across a wide range of applications including electronics projects, DIY builds, prototyping, and educational experiments.
Common use cases:
- Integrating into a custom electronics project
- Learning and experimenting with circuits
- Replacing or upgrading components in existing setups
This product is ideal for electronics enthusiasts, engineers, and students.
Technical Tip: Always verify voltage and current requirements before connecting to your circuit. Check datasheets for detailed specifications and pin configurations.
Shipping & Delivery
- Free shipping on orders above ₹999 across India
- Dispatched within 1-3 business days
- Expected delivery: 3-7 business days depending on location
- Secure packaging to ensure safe transit of electronic components
