Connect your Phone to Arduino using Bluetooth

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Bluetooth is a powerful device for short-range communication. You must be familiar with Bluetooth, the one that we have in our smartphones. Do you know that you can connect your smartphone with Arduino using the popular HC-05 Bluetooth module. In the following article, we will learn to connect your android phone with Arduino and controlling it.

Material Required

Hardware

HardwareQuantity
Arduino UNO1
USB Cable1
HC-O5 Bluetooth 1
BreadBoard1
Jumper wiresAPR
LED1
220-OHM Resistor1

Software

SoftwareLink
Arduino IDEHow to install and Arduino software download software
Android ApplicationArduino Bluetooth control
CodeDownload

How Arduino uses Bluetooth

HC-05 Bluetooth is based on SPP (Serial Port Protocol) module, designed to send serial wireless data between two different bluetooth devices.

Pinout

KeyUsed to start for AT Command (You can change the name and password with AT Command)
Vcc3.3v-5v supply
GNDGround
TXDTransmitter (Transmit data )
RXDReceiver (Revive data)
StateEnable or disable the module to save power

Features

  • -80dBM Sensitivity
  • Up to +4dBM RF transmit power
  • Operate on 1.8-3.6V
  • PIO control
  • UART interface with programmable baud rate
  • Integrated Antenna
  • Edge Connector

Connection

Connection with HC-05 Arduino is very simple. HC-05 works on both 3.3V & 5V, it is recommended to use 5v. This module is having an inbuild 3.3V voltage regulator.

arduino bluetooth module
Arduino PinHC-05 Module Pin
Pin 0 (RX)TX
Pin 1 (TX)RX
VCC5V
GNDGND

Note:- RX and TX alway connect in cross connection

Mobile Application Setup

Download the application Arduino Bluetooth Control from the Google Play Store.

The next step is to pair your mobile phone with the HC-05 Module. To do so, open your mobile, go to Settings>Bluetooth. Then, turn on the Bluetooth, and search for the device in the list. Find your device (generally end with HC-05), it will ask for a password. The default password for HC-05 must be 0000 or 1234.

After pairing, open the app and connect with the Module.

Arduino using Bluetooth

Open buttons and press 1 and 2. Also, you can send custom data or re-program the buttons.

Arduino using Bluetooth

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