HC-02 Bluetooth module
Users do not need to care about complex wireless communication configuration and transmission algorithms. They only need to connect to devices through TTL serial port. Powered the HC-02 slave module, and can be connected to the mobile phone for data transmission. In addition, it can be used with HC-05 or HC-06 hosts
(matching code, default is 1234) to connect, can replace a traditional serial line, save wiring work, use
It’s very flexible.
If you need to use iPhone or iPad to control your arduino project, hc-02 4.0 ble slave module with 6pin baseboard may be a good choice. Fully compatible with ios7.0 or later. Also compatible with Android 4.3 or later.
Please note:
This module supports Bluetooth 4.0 ble mode and Bluetooth 2.0 mode.
Features
- Model HC-02 Module size 27*13mm
- Work band 2.4G Air rate 2Mbps
- Communication interface UART3.3V TTL Antenna interface built-in PCB antenna
- Working voltage 3.0~3.6V Communication current 30mA
- Baud rate 1200~115200bps Receiver sensitivity -85dBm@2Mbps
- Communication level 3.3V Working humidity 10%~90%
- The transmitting power 6dBm (maximum) Storage temperature -40 C ~+85 C
- Reference distance 10m Working temperature -25 C ~75 C
- Core module uses HC-08, leads from the module interface includes VCC, GND, TXD, RXD, LED status output pin.
- Led indicate Bluetooth connection status, flashing Bluetooth connectivity, lit the Bluetooth connection and open a port Backplane
- 3.3V LDO input voltage 3.6 6V, the input voltage to prohibit more than 7V
- The interface level 3.3V, can be directly connected the various SCM (51, AVR, PIC, ARM, MSP430, etc.), the 5V MCU also can be connected directly.
- Open to the effective distance of 10 meters, over 10 meters is also possible, but not of this the quality of the connection of the distance do to ensure.
- After the pair when full-duplex serial port to use, do not need to know anything about the Bluetooth protocol, but only supports 8 data bits, 1 stop bit, no parity communication format, which is the most commonly used communication format does not support other formats .
- Compact (3.57cm * 1.52cm), the factory chip production to ensure the placement quality. And sets of transparent heat shrink tubing, dust and beautiful, and anti-static.
- 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
Where to use HC-02 Bluetooth module
The HC-02 is a very cool module which can add two-way (full-duplex) wireless functionality to your projects. You can use this module to communicate between two microcontrollers like Arduino or communicate with any device with Bluetooth functionality like a Phone or Laptop. There are many android applications that are already available which makes this process a lot easier. It’s also fully compatible with the iPhone. The module communicates with the help of USART at 9600 baud rate hence it is easy to interface with any microcontroller that supports USART. We can also configure the default values of the module by using the command mode. So if you looking for a Wireless module that could transfer data from your computer or mobile phone to microcontroller or vice versa then this module might be the right choice for you.
However do not expect this module to transfer multimedia like photos or songs; you might have to look into the CSR8645 module for that.
The HC-02 has two operating modes, one is the Data mode in which it can send and receive data from other Bluetooth devices and the other is the AT Command mode where the default device settings can be changed. We can operate the device in either of these two modes by using the key pin as explained in the pin description.
It is very easy to pair the HC-02 module with microcontrollers because it operates using the Serial Port Protocol (SPP). Simply power the module with +5V/+3.3V and connect the Rx pin of the module to the Tx of MCU and Tx pin of module to Rx of MCU as shown in the figure below
Connect with Android phone
HC-02 can be connected to Android mobile via Bluetooth, and Android can use Android serial assistant software.
Note:
Proprietary Service UUID: 49535343-FE7D-4AE5-8FA9-9FAFD205E455
TX UUID: 49535343-1 E4D-4BD9-BA61-23C647249616
RX UUID: 49535343-8841-43F4-A8D4-ECBE34729BB3
Connect with PC
HC-02 can connect to the computer’s Bluetooth device to communicate.
Applications
1. Wireless communication between two microcontrollers
2. Communicate with Laptop, Desktops and mobile phones
3. Data Logging application
4. Consumer applications
5. Wireless Robots
6. Home Automation
AT Command
The way to the AT command mode: supply power to the module, it will enter to the AT mode if it
needn’t pair. The interval of command is about 1 second.
Default parameter: Baud rate:9600N81, ID: linvor, Password:1234
1. Test communication
Send: AT (please send it every second)
Back: OK
2. Reset the Bluetooth serial baud rate
Send: AT+BAUD1
Back: OK1200
Send: AT+BAUD2
Back: OK2400
……
1———1200
2———2400
3———4800
4———9600 (Default)
5———19200
6———38400
7———57600
8———115200
9———230400
A———460800
B———921600
C———1382400
PC can’t support the baud rate lager than 115200. The solution is: make the MCU have higher baud
rate (lager than 115200) through programming, and reset the baud rate to low level through the AT
command.
The baud rate reset by the AT command can be kept for the next time even though the power is cut
off.
3. Reset the Bluetooth name
Send: AT+NAMEname
Back: OKname
Example:
Send: AT+NAMEosoyoo
Back: OKname
At this time the Bluetooth name is changed to “osoyoo”.
4. Change the Bluetooth pairing password
Send: AT+PINxxxx
Back: OKsetPIN
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