Bluetooth Module HC-05 HC05 Arduino Wireless Serial Port TX RX Module TechMakers
Price RM13.80
Product SKU 40-000053
Size (L x W x H) 3.8 cm x 1.6 cm x 0.3 cm
Reward Points 23
Points Needed 900
Availability 2 - 3 Days
  • Power Supply: 3.6VDC to 6VDC
  • Passkey: 1234
  • Operating Current: 30mA
  • Communication range: 10 meters
  • Dimension: 16 x 38mm

The HC-05 is a class 2 Bluetooth module designed for transparent wireless serial communication. It is pre-configured as a slave Bluetooth device. Once it is paired to a master Bluetooth device such as PC, smart phones and tablet, its operation becomes transparent to the user. No user code specific to the Bluetooth module is needed at all in the user micro-controller program. The HC-05 supports two work modes: Command and Data mode. The work mode of the HC-05 can be switched by the on-board push button. The HC-05 is put in Command mode if the push button is activated. In Command mode, user can change the system parameters (e.g. pin code, baud rate, etc) using host controller itself of a PC running terminal software using a serial to TTL converter. Any changes made to system parameters will be retained even after power is removed. Power cycle the HC-05 will set it back to Data Mode. Transparent UART data transfer with a connected remote device occurs only while in Data Mode. The HC-05 can be re-configured by the user to work as a master Bluetooth device using a set of AT commands. Once configured as master, it can automatically pair with a HC-05 in its default slave configuration or a HC-06 module, allowing a point to point serial communication. The HC-05 will work with supply voltage of 3.6VDC to 6VDC, however, the logic level of RXD pin is 3.3V and is not 5V tolerant. It can be damaged if connect directly to a 5V device (e.g Arduino uno and Mega). A Logic Level converter is recommended to protect the HC-05. The power to the HC-05 will cut off if the "EN" pin is pulled to logic 0.


  • Bluetooth v2.0+EDR
  • 2.4GHz ISM band frequency
  • Supported baud rate: 9600, 19200, 38400(default), 57600, 115200, 230400, 460800
  • Speed: Asynchronous: 2.1Mbps (Max) / 160kbps, Synchronous: 1Mbps / 1Mbps
  • Power Supply: 3.6VDC to 6VDC
  • Passkey: 1234
  • Operating Current: 30mA
  • LED flashes = Bluetooth is connecting
  • LED on = Bluetooth is connected
  • Communication range: 10 meters
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1 x Bluetooth Module HC-05