This is the Blue variant of the HC-05 4pin Bluetooth Module(Master+Slave) Without Button in Bluetooth and NRF Modules. Available at ₹467.28 (₹396.00 + GST) with free shipping across India.
HC-05 4pin Bluetooth Module(Master+Slave) Without Button
Description:
The HC-05 4-Pin Wireless Serial Bluetooth Module is a versatile Bluetooth solution compatible with any microcontroller. Using the UART protocol, it enables seamless wireless data transmission and reception.
This module can function as both a Master and a Slave device, allowing it to operate as a transmitter or receiver. This dual functionality makes it ideal for connecting to a wide range of devices, including smartphones, computers, keyboards, and other HC-05 modules. To connect with multiple slave devices, however, a master module is required.
Overall, the HC-05 Bluetooth Module offers a flexible and reliable solution for establishing Bluetooth connections in various applications, providing convenience and versatility for wireless communication.
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 |
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.
Specification:
| Maximum Operating Range (m) | 10 |
|---|---|
| Operating Frequency | 2.4GHz ISM band |
| Modulation | GFSK (Gaussian Frequency Shift Keying) |
| Emission power | 4dBm, Class 2 |
| Sensitivity | -84dBm at 0.1% BER |
| Operating Temperature (℃) | -20 ~ +75 |
| Length (mm) | 43 |
| Width (mm) | 16.5 |
| Height (mm) | 7 |
| Weight (gm) | 5 |
| Shipping Weight | 0.01 kg |
| Shipping Dimensions | 4 × 4 × 1 cm |
Tutorial:
Package Includes:
1 X HC-05 4pin Bluetooth Module(Master+Slave) No Button
HC-05 4pin Bluetooth Module(Master+Slave) Without Button Overview
The HC-05 4pin Bluetooth Module (Master+Slave) Without Button is a compact wireless serial interface that supports Bluetooth Specification v2.0+EDR. Designed for seamless UART communication, it can act as either a Master or Slave device, making it ideal for embedded projects and data exchange between microcontrollers, computers, and smartphones.
Key Features of HC-05 4pin Bluetooth Module(Master+Slave) Without Button
- Bluetooth v2.0+EDR compliance with GFSK modulation for reliable data links
- Operates in the 2.4 GHz ISM band with Class 2 emission power (≤4 dBm) and –84 dBm sensitivity
- Dual-mode operation allows configuration as Master or Slave via AT commands
- 4-pin header (VCC, GND, TXD, RXD) without onboard button for streamlined PCB integration
- UART interface supports up to 3 Mbps; default baud rate 9600 bps (8N1)
- Genuine module supplied by Zbotic with fast shipping across India
Applications and Use Cases
- Wireless serial communication between Arduino, ESP32, Raspberry Pi, and other microcontrollers
- Remote control of robots, drones, or RC vehicles via smartphone apps
- Data logging from sensors to PCs or mobile devices without cables
- Bluetooth-enabled home automation switches and smart lighting controls
- Wireless keyboard/mouse interfaces for DIY embedded systems
- Peer-to-peer connection between two HC-05 modules for point-to-point links
How to Use HC-05 4pin Bluetooth Module(Master+Slave) Without Button
Connect VCC to 5 V (or 3.3 V tolerant), GND to ground, TXD to your microcontroller’s RX pin, and RXD to TX. Power up the module and pair it to a host device using the default PIN (“1234” or “0000”). To switch modes, pull the KEY (EN) pin high before power-up and send AT commands over UART at 38400 bps (AT+ROLE=1 for Master, AT+ROLE=0 for Slave).
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 enter AT command mode without a button?
This module lacks a reset button; to enter AT mode, pull the KEY pin high (to 3.3 V) before powering up. The LED will blink slowly to indicate AT readiness.
What is the default baud rate for normal operation?
By default, the HC-05 communicates at 9600 bps (8 data bits, no parity, 1 stop bit). You can change this via AT commands in AT mode.
Can I pair this HC-05 with a smartphone?
Yes, it appears as a Bluetooth serial port on Android or Windows devices. Use a terminal or custom app to send and receive UART data wirelessly.
Arduino Pro Mini Pinout, Programming and Low-Power Tips
The Arduino Pro Mini is one of the most compact and power-efficient Arduino boards available — making it...
Read More →
Arduino vs STM32: Which Microcontroller Platform Wins?
The Arduino vs STM32 debate is one of the most common discussions in the maker and embedded systems...
Read More →
PCB Technical Design Guidelines
PCB Design Guidelines Impedance Control Controlled impedance is available for high-speed digital and RF designs. Use the impedance...
Read More →Technical Specifications
| Model | HC-05 |
|---|---|
| Pin Count | 4-pin |
| Interface / Protocol | Bluetooth |
| Color | Blue |
| SKU | AI3553 |
| Weight | 0.0052 kg |
| Availability | In Stock |
Applications & Use Cases
The HC-05 4pin Bluetooth Module(Master+Slave) Without 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
Atharv Tandon (verified owner) –
Decent HC-05 4pin Bluetooth Module Without Button. Connection is stable indoors. Outdoor range slightly less than expected.
Darshan Nayak –
This HC-05 4pin Bluetooth Module Without Button is reliable and consistent. Using it for long-range data transfer.
Gaurav Kulkarni (verified owner) –
Decent HC-05 4pin Bluetooth Module Without Button. Connection is stable indoors. Outdoor range slightly less than expected.
Ajay Kumar (verified owner) –
Very satisfied with this HC-05 4pin Bluetooth Module Without Button. Low power consumption makes it ideal for battery projects.
Prateek Rathore (verified owner) –
This HC-05 4pin Bluetooth Module Without Button is reliable and consistent. Using it for long-range data transfer.
Isha Nair (verified owner) –
Decent HC-05 4pin Bluetooth Module Without Button. Connection is stable indoors. Outdoor range slightly less than expected.
Pankaj Gupta (verified owner) –
Great HC-05 4pin Bluetooth Module Without Button. Using in my vehicle tracking system. Works flawlessly.
Sachin Dhawan (verified owner) –
Decent HC-05 4pin Bluetooth Module Without Button. Connection is stable indoors. Outdoor range slightly less than expected.
Arun Panchal (verified owner) –
Great HC-05 4pin Bluetooth Module Without Button. Using in my vehicle tracking system. Works flawlessly.
Tarun Bisht (verified owner) –
This HC-05 4pin Bluetooth Module Without Button is reliable and consistent. Using it for long-range data transfer.
Amit Deshpande –
Great HC-05 4pin Bluetooth Module Without Button. Using in my vehicle tracking system. Works flawlessly.
Chetan Shah –
Outstanding! This HC-05 4pin Bluetooth Module Without Button made my IoT mesh network project possible. Highly recommended.
Vijay Sen (verified owner) –
Great HC-05 4pin Bluetooth Module Without Button. Using in my vehicle tracking system. Works flawlessly.
Dinesh Trivedi (verified owner) –
Love this HC-05 4pin Bluetooth Module Without Button. Integrated it with my Arduino in no time. Excellent documentation.
Sandeep Bose (verified owner) –
Very satisfied with this HC-05 4pin Bluetooth Module Without Button. Low power consumption makes it ideal for battery projects.
Ayush Nayak (verified owner) –
Decent HC-05 4pin Bluetooth Module Without Button. Connection is stable indoors. Outdoor range slightly less than expected.
Sumit Reddy (verified owner) –
Very satisfied with this HC-05 4pin Bluetooth Module Without Button. Low power consumption makes it ideal for battery projects.
Hitesh Hegde (verified owner) –
Great HC-05 4pin Bluetooth Module Without Button. Using in my vehicle tracking system. Works flawlessly.