HC-05 Bluetooth Module Specs You Need to Know This Year

You want a bluetooth module that matches your project’s demands. The hc-05 bluetooth module gives you a strong set of features. Check the main specs in the table below:

Specification	Value
Bluetooth version	2.0 + EDR
Voltage	3.3V to 5V DC
Current	less than 50mA
Range	about 10 meters (33 feet)
Data rate	up to 1Mbps
Supported modes	SPP, HID, and others

You can use the hc-05 in both master and slave modes. This flexibility lets you create many types of wireless projects. The module supports fast data transfer and stable bluetooth connections. You can rely on the hc-05 for simple or advanced designs.

Key Takeaways

• The HC-05 Bluetooth module can work as master or slave. This helps you make many types of projects.

• It uses 3.3V to 5V and needs less than 50mA. This means it does not use much energy.

• The wireless range is about 10 meters. The data rate can go up to 1Mbps. This makes the HC-05 good for indoor use.

• You can use AT commands to change settings. You can set things like baud rate and pairing PIN for your project.

• The HC-05 works with many microcontrollers. It works with Arduino and Raspberry Pi. This makes it easy to add to your projects.

Key Features of HC-05 Bluetooth Module

Main Technical Specs

You might wonder why the hc-05 is special. This bluetooth module has many features for lots of projects. Here are the main technical specs you should know before starting:

• Bluetooth version: 2.0 + EDR gives fast and steady wireless links

• Voltage range: 3.3V to 5V DC, so it works with many power sources

• Current: Less than 50mA, which helps your project use less energy

• Wireless range: About 10 meters (33 feet), good for most rooms

• Data rate: Up to 1Mbps, so you can move data fast

• Supported modes: Master and Slave, so you have more ways to connect

• Communication: UART interface (TXD/RXD) makes serial communication simple

• Dimensions: Small size fits in tight spaces

Tip: The hc-05 can be master or slave. This means you can use it in more bluetooth projects than modules that only work as a slave.

Quick Specs Overview

You can look at the hc-05 and compare it to other modules. This helps you see why many people pick it. The table below shows how it is different from the hc-06:

Feature	HC-05	HC-06
Role	Master and Slave	Slave only
Number of Pins	6	4

When you pick a bluetooth module, check the most important specs. The table below gives you a quick look at the hc-05:

Parameter	Specification
Bluetooth Standard	Bluetooth 2.0 + EDR
Operating Frequency	2.4 GHz ISM Band
Receiver Sensitivity	Typical -80 dBm
RF Transmit Power	Up to +4 dBm
Supply Voltage (Module)	3.6V to 6V
Logic Voltage	3.3V
UART Interface	Serial Communication (TXD/RXD)
Supported Communication Mode	Master and Slave
Antenna	Integrated PCB Antenna
Wireless Range	Typically up to 10 meters

The hc-05 comes with helpful default settings. The default AT mode baud rate is 38400 bps. The default data mode baud rate is 9600 bps. You can change the baud rate from 9600 to 460800 bps. The default pairing PIN is 1234 or 0000. The module can reconnect to devices it paired with before.

The hc-05 bluetooth module is flexible and reliable. It helps you add bluetooth to your project. You can use it for wireless data, remote control, or sensor networks. Its features make it a good choice for many electronics projects.

Detailed Specifications

Bluetooth Version & Protocols

The hc-05 uses Bluetooth 2.0 + EDR. This version gives fast and steady wireless links. The module works with the Serial Port Profile (SPP) protocol. You can see the main details in the table below:

Feature	Details
Bluetooth Version	2.0+EDR
Compatible Protocol	Serial Port Profile (SPP)

Bluetooth 2.0 + EDR lets you use uart serial communication for short wireless projects. You can send and get data between your microcontroller and another bluetooth device. Remember, this module does not work with Bluetooth Low Energy (BLE). If you want to use most new iOS devices, you need a BLE module. The hc-05 works well with Android and classic bluetooth devices.

• The hc-05 runs on Bluetooth 2.0 + EDR.

• This version lets you use uart serial communication for steady short-range wireless links.

• You may have trouble using it with new devices, especially iOS, because it does not have BLE.

• Most new iOS devices do not work with classic bluetooth modules like hc-05 unless you use special apps.

• BLE modules like HM-10 are better if you want to use new smartphones.

Voltage & Current

You can power the hc-05 with 3.3V to 5V. This range makes it easy to use with many microcontrollers and power sources. The module uses less than 40mA when working and less than 1mA in standby. This low current helps your battery last longer.

Specification	Value
Operating Voltage Range	3.3V to 5V
Active Current Consumption	Less than 40mA
Standby Current Consumption	Less than 1mA

• The voltage range of 3.3V to 5V lets you use different power sources.

• Low current use (less than 40mA) helps your battery last longer.

• Standby current is very low (less than 1mA), which saves power.

You can connect the hc-05 to boards like arduino or other microcontrollers without extra voltage parts. Always check the datasheet for the right wiring.

Communication Interface (UART)

The hc-05 uses a uart interface for serial communication. You connect the TXD and RXD pins to your microcontroller. The default baud rate is 9600 bps, but you can change it with at commands. The module supports at command mode for setup.

Feature	Details
Communication Interface	UART (Universal Asynchronous Receiver-Transmitter)
Default Baud Rate	9600 bps
Configuration	Supports AT commands

• The hc-05 uses uart pins to send data from a microcontroller and turns it into bluetooth signals.

• It gets data from bluetooth devices and changes the wireless signals back into serial data for the microcontroller.

• You make a wireless serial link by pairing the hc-05 with another bluetooth device. This link lets data go both ways.

Tip: Use the at command set to change things like baud rate, device name, and pairing pin.

Wireless Range & Data Rate

The hc-05 can send data about 10 meters (33 feet). This range is good for most indoor projects. The data rate can go up to 1Mbps, which is fast for many uses.

• Wireless range: About 10 meters (33 feet)

• Data rate: Up to 1Mbps

You can send sensor data, control signals, or other data quickly and easily.

Dimensions & Pinout

The hc-05 is small. You can fit it into tight spaces on your circuit board. The module usually has 6 pins: EN, VCC, GND, TXD, RXD, and STATE. Here is a sample pinout:

Pin	Function
EN	Enable/Key
VCC	Power Supply
GND	Ground
TXD	UART Transmit
RXD	UART Receive
STATE	Connection Status

You should check the datasheet for the exact size and pin layout.

Modes: Master & Slave

The hc-05 can work as master or slave. You set the mode with at commands. In master mode, the module looks for and connects to other bluetooth devices. In slave mode, it waits for other devices to connect.

• Master mode: The hc-05 starts the connection.

• Slave mode: The hc-05 waits for another device to connect.

This makes the module useful for many wireless projects.

Default Settings & Configurability

The hc-05 comes with helpful default settings. The default baud rate in data mode is 9600 bps. The default pairing pin is 1234 or 0000. You can use at command mode to change settings like baud rate, device name, and pin code. The at command mode gives you full control over the module’s setup.

• Default baud rate: 9600 bps (data mode)

• Default pairing pin: 1234 or 0000

• at command mode: Lets you change settings with at commands

Note: Always use the at command set for safe and easy setup.

Certifications & Compliance

The hc-05 bluetooth module meets common rules for wireless devices. You should check the datasheet or ask your seller for details about certifications. Most modules meet FCC, CE, and RoHS rules. These certifications help you use the module in school or business projects.

• FCC: Meets US wireless device rules

• CE: Meets European safety and health rules

• RoHS: Limits harmful substances

You can trust the hc-05 for safe and legal use in your electronics projects.

Compatibility & Integration

Supported Microcontrollers

You can use the hc-05 bluetooth module with lots of microcontrollers. Arduino is the most common one people use. You can also connect it to Raspberry Pi, ESP32, STM32, and PIC boards. The module works with any microcontroller that has serial communication. You only need two pins: TX and RX. This makes adding the hc-05 to your project simple. You do not need extra hardware to set it up. Many students and hobbyists pick the hc-05 for wireless projects.

Tip: Always check your microcontroller’s voltage levels before you connect the hc-05.

Voltage Logic Levels

The hc-05 uses 3.3V logic for its serial pins. Some boards, like arduino Uno, use 5V logic. You must keep the RX pin of the hc-05 safe from high voltage. You can use a voltage divider or a level shifter for this. The VCC pin can take 3.3V to 5V, but the serial pins need 3.3V logic. This keeps your bluetooth module from getting damaged.

Pin	Logic Level
TXD	3.3V
RXD	3.3V (max)

If you use the right voltage, your connection will stay strong. You will not have problems with data loss or dropped connections.

Typical Applications

You can use the hc-05 in many different projects. Here are some common ways people use it:

• Send data wirelessly between two microcontrollers

• Control robots or cars from far away

• Send sensor data to a phone or computer

• Make home automation systems

• Use wireless serial communication for debugging

The hc-05 can be master or slave. You can set the module to pairing mode with easy AT commands. This makes setup simple. You can use the hc-05 for quick bluetooth pairing and steady wireless links. The module works well for any device that needs to send serial data. You can finish setup fast and start sending data right away.

Note: Always test your bluetooth connection after setup to make sure your device pairs and talks as it should.

HC-05 Bluetooth Module Reference Table

Specs Summary Table

If you want to see the main specs fast, use this table. It shows all the important details for the hc-05. You can look at the table to help you pick the right bluetooth module for your project. It helps you know if the hc-05 will work for your wireless needs, power, and what boards it works with.

Tip: Keep this table close when you build with bluetooth. It can help you not make mistakes and finish your project faster.

Parameter	Specification
Bluetooth Version	2.0 + EDR
Protocols Supported	SPP, HID
Operating Voltage	3.3V to 5V
Logic Level	3.3V
Current Consumption	< 40mA (active), < 1mA (standby)
Wireless Range	Up to 10 meters (33 feet)
Data Rate	Up to 1Mbps
Communication Interface	UART (TXD/RXD)
Default Baud Rate	9600 bps (data mode), 38400 bps (AT mode)
Supported Modes	Master, Slave
Antenna	Integrated PCB Antenna
Dimensions	Approx. 37mm x 13mm x 2mm
HC-05 Pin Configuration	EN, VCC, GND, TXD, RXD, STATE
Certifications	FCC, CE, RoHS
Compatible Boards	Arduino, Raspberry Pi, ESP32, STM32, PIC

The hc-05 gives good bluetooth speed and works with many power sources. The pin setup is simple, so you can connect it to arduino and other boards easily. You get strong data transfer and a steady wireless link for your project.

For example, you might want to send sensor data from arduino to your phone. You can use the hc-05 bluetooth module for this. Just connect the TXD and RXD pins to your microcontroller. Set the baud rate and pair the module with your device. You can start sending bluetooth data in just a few minutes.

Note: Always check the voltage and logic level before you connect the hc-05. This keeps your module safe and makes sure your bluetooth works well.

You learned the main specs of the hc-05 bluetooth module. The hc-05 gives you steady bluetooth links. It uses little power and is simple to set up. You can send data fast with it. You can use it with arduino or other boards. For example, you can make a wireless sensor project. Pick the hc-05 if you want easy setup and good performance.

 

 

 

 

 

Written by Jack Elliott from AIChipLink.

 

AIChipLink, one of the fastest-growing global independent electronic   components distributors in the world, offers millions of products from thousands of manufacturers, and many of our in-stock parts is available to ship same day.

 

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