HC-05 overview
HC-05 Bluetooth Module (With EN Pin) Breakout is the latest Bluetooth wireless serial Module. This version of the popular Bluetooth module uses the HC-05. These modems work as serial (RX/TX) pipes. Any serial stream from 9600 to 115200bps can be passed seamlessly from your computer to your target. The remote unit can be powered from 3.3V up to 6V for easy battery attachment. All signal pins on the remote unit are 3V-6V tolerant. No level shifting is required.
Key specifications
Operating Voltage
4V to 6V (Typically +5V)
Operating Current
30mA
Range
<100m
Datasheet
hc-05-datasheet.pdf
HC-05 features
- Serial Bluetooth module for Arduino and other microcontrollers
- Works with Serial communication (USART) and TTL compatible
- Follows IEEE 802.15.1 standardized protocol
- Uses Frequency-Hopping Spread Spectrum (FHSS)
- Can operate in Master, Slave, or Master/Slave mode
- Can be easily interfaced with Laptops or Mobile phones with Bluetooth
HC-05 pinout
| Name | Description |
|---|---|
| Enable / Key | This pin is used to toggle between Data Mode (set low) and AT command mode (set high). By default, it is in Data mode |
| Vcc | Powers the module. Connect to +5V Supply voltage |
| Ground | Ground pin of module, connect to system ground. |
| TX – Transmitter | Transmits Serial Data. Everything received via Bluetooth will be given out by this pin as serial data. |
| RX – Receiver | Receive Serial Data. Every serial data given to this pin will be broadcasted via Bluetooth |
| State | The state pin is connected to a board LED, it can be used as feedback to check if Bluetooth is working properly. |
HC-05 applications
- Communicate with laptops, Desktops, and mobile phones
- Data Logging Application
- Consumer Applications
- Wireless Robots
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