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Bluetooth Wireless Serial Port Transmission Module HC-05

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Wireless Module
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Packaging & Delivery

Selling Units:
Single item
Single package size: 
3.5X2X3 cm
Single gross weight:
0.010 kg
Package Type:
1,the product is packed in electrostatic bags, 2,using a bubble wrap, 3,using carton packaging. In stock HC-05
Lead Time :
Quantity(Pieces) 1 - 1000 >1000
Est. Time(days) 7 To be negotiated
Product Description

Bluetooth Wireless Serial Port Transmission Module HC-05


Ⅰ. The module is HC-05 module, which is a master-slave integrated module. The master-slave mode can be set by AT instructions, and the instructions are rich.
Ⅱ. Introduction of Naming Rules for Product Series
The difference between HC-05 and HC-06:
HC-05 is a master-slave integrated Bluetooth serial port module. The master-slave can switch instructions, and the instructions are rich and complete.
HC-06 is a product with separate master and slave modules. The master can never be switched. It is set by the factory. It is easy to use and cheap.
The difference between HC-05 and other similar products:
ⅠⅡ. Product Description
1. Using CSR mainstream Bluetooth chip and Bluetooth V2.0 protocol standard
2. The working voltage of the serial module is 3.3V, and the distance is generally 10 meters.
3. The default baud rate is 9600, which can be set by users.
4. Supporting Software Setting Master-Slave Mode
5. Indicating the working state, connecting and disconnecting the output of the state signal, which is convenient for MCU to track the state of the module.
6. The size of core module is 28mm x 15mm x 2.35mm.
7. Working Current: Pairing: 30-40 mA Pairing Completed Not Communicated: 8 mA in 2-8 Ma Communication
8. Dormancy Current: Non-dormancy
9. Used in GPS navigation system, water and gas meter reading system, industrial field acquisition and control system.
10. It can be seamlessly connected with Bluetooth notebook computers, computers, Bluetooth adapters, PDA and other devices.
Four. Product Application
This module is mainly used in the field of short-distance data wireless transmission. It can be easily connected to the Bluetooth device of PC, or the data between the two modules can be exchanged. Avoid tedious cable connection, can directly replace the serial line.
Bluetooth printer Wireless data acquisition;
_Bluetooth remote control toys_automobile detection equipment;
_Industrial remote control and telemetry; Bluetooth wireless data transmission;
_Traffic, underground positioning, alarm; POS system, wireless keyboard, mouse;
_Automated data acquisition system Wireless data transmission; Banking system;
Government Street Lamp Energy Saving Equipment Interactive Program Voting Equipment of TV Station;
Wireless LED display system Bluetooth joystick, Bluetooth game handle
Intelligent Home, Industrial Control, Building Automation, Security, Wireless Monitoring of Computer Room Equipment, Access Control System 
V. Product Characteristics
1. The power supply voltage is 3.3V, the current is about 2-8mA when it is not matched, and about 20mA after matching. It is absolutely forbidden to connect back power!
2. The led pin indicates the Bluetooth connection status, the output pulse indicates that there is no Bluetooth connection, and the output high indicates that Bluetooth has been connected and the port has been opened.
3. The interface level is 3.3V. It can connect all kinds of microcontrollers directly (51, AVR, PIC, ARM, MSP430, etc.). The 5V microcontroller can also be connected directly without MAX232 or MAX232.
4. The module is connected to the computer, and the MAX3232 chip is connected to the serial port of the computer.
5. The effective distance of open space is about 10 meters, but the connection quality of this distance is not guaranteed.
6. When full duplex serial port is used after pairing, it does not need to know any Bluetooth protocol, but only supports 8-bit data bit, 1-bit stop bit and no parity check communication format. This is also the most commonly used communication format, and does not support other formats.
7. Support setting baud rate, name and paired password through AT command when Bluetooth connection is not established, and save the set parameters when power fails. Automatically switch to transfer mode after Bluetooth connection
8. Small size 28 mm x 15 mm x 2.35 mm, factory patch production, to ensure the quality of patch.
9. The link is slave. The slave can be paired with various computers with Bluetooth function, Bluetooth host, most mobile phones with Bluetooth, PDA, PSP and other intelligent terminals. The slave can not be paired with each other.
AT instruction set
HC-05 embedded Bluetooth serial communication module (hereinafter referred to as module) has two working modes: command response mode and automatic connection mode. In the automatic connection mode, the module can be divided into three working roles: Master, Slave and Loopback. When the module is in the automatic connection mode, the data transmission will be automatically connected according to the pre-set mode. When the module is in the command response mode, all AT commands can be executed. Users can send various AT commands to the module, setting control parameters for the module or issuing control commands. By controlling the input level of the external pin (PIO11) of the module, the dynamic conversion of the working state of the module can be realized.
Pin definitions for serial module:
1. PIO8 connects to the LED to indicate the working status of the module. The module flickers when it is powered on, and the flicker interval is different in different states.
2. PIO9 connects to the LED, indicating that the module is connected successfully. After the Bluetooth serial port matching connection is successful, the LED will be long and bright.
3. PIO11 module status switch pin, high level - > AT command response working state, low level or suspended - > Bluetooth normal working state.
4. The module has a reset circuit, and the reset will be completed when the power is restarted.
The steps of setting up the main module are as follows:
1. PIO11 is high.
2. On power, the module enters the AT command response state.
3. Super terminal or other serial port tools, set baud rate 38400, data bit 8, stop bit 1, no check bit, no flow control.
4. The serial port sends the character "AT + ROLE = 1 r n" and returns "OK r n" successfully, where r n is a return line.
5. PIO is set low, power on again. Module is the main module, search slave module automatically and establish connection.


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Q1What's your company nature?

A: We are a combination of manufacturers and agents, with the Top Professional Team, serving integrated circuits, diodes, transistors, sensors, Bluetooth modules, IGBT modules, capacitors, resistors, inductors, crystals, relays, connector switch sockets, fuses, LED, buzzer and so on electronic components!

Q2: What's your products MOQ?

A: We provide you small MOQ for each item, it depends your specific order!


Q3: How about your delivery time?

A: Generally, our stock products would be shipped in 2-3days after payment received, finally depends on order quantities.


Q4: What's your warranty?

A: All our products will be 100% test before shipment. Warranty 360days!


Q5: How do you make our business long-term and good relationship?

A: We keep good quality and competitive price to ensure our customers benefit ;

We respect every customer as our friend and we sincerely do business and make friends with them,It's not something that can be replaced.


Q6: Do you also support quote BOM list? then Shipment to us together?

A: Yes, we also can support quote BOM and shipment all components together. Please send list to us for check. We have professional team and quote immediately.


Q7: How to contact us?
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