Shopping Cart

Connecting an HC-05 Bluetooth module with an Arduino allows you to establish wireless communication between your Arduino and other Bluetooth-enabled devices, such as smartphones, tablets, or other microcontrollers. Here’s a step-by-step guide on how to connect and use the HC-05 Bluetooth module with an Arduino Uno:

Components Needed:

1. Arduino Uno
2. HC-05 Bluetooth module
3. Breadboard and jumper wires
4. USB cable for Arduino Uno

HC-05 Bluetooth Module Pinout:

The HC-05 module typically has six pins:

• VCC: Power supply (typically +5V, but can be +3.3V)
• GND: Ground (connect to Arduino GND)
• TXD: Transmit data (connect to Arduino RX pin)
• RXD: Receive data (connect to Arduino TX pin)
• STATE: State indication (optional, not always used)
• EN (Enable): Module enable pin (optional, not always used)

Wiring Instructions:

1. Power and Ground Connections:

   • VCC of the HC-05 module to 5V on the Arduino Uno.
   • GND of the HC-05 module to GND on the Arduino Uno.

2. Serial Communication Pins:

   • TXD (Transmit Data) of the HC-05 module to RX (Receive) pin on the Arduino Uno (e.g., pin 0).
   • RXD (Receive Data) of the HC-05 module to TX (Transmit) pin on the Arduino Uno (e.g., pin 1).

3. Optional Connections:

   • STATE (Status) pin of the HC-05 module can be left unconnected or connected to an Arduino digital pin if you want to monitor the module's state.
   • EN (Enable) pin of the HC-05 module can be connected to 5V to enable the module permanently (or to a digital pin on the Arduino for control).