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Home Automation Using Arduino Through Android Device

This project is based on Interfacing an android application to Arduino Uno board using Bluetooth. The result is a home automation system with minimal electronic components without complex soldering and simple and flexible design.

Parts List

  • Arduino Uno R3 Development Board (or a trusted working clone would work fine)
  • Bluetooth Module (Preferably HC-05)
  • Android Device (Preferably one running v4.0 or above)
  • Relays (R1 – R6 in Schematic diagram)
  • Connectors
  • USB cable for Arduino

Block Diagram

Schematic Diagram

The diagram of the relay in the above figure is placed upside down for easy reference to the relay pin connections shown in the below figure.

Relay pin connections

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  1. Connect pins 2-7 of Arduino to Relays R1-R6 at pin “x” of each relay respectively.
  2. Interconnect all the “y” pins of each relay and connect one of them to the GND pin of Arduino.
  3. Connect VCC of Bluetooth module to 5v power pin of Arduino and likewise GND pin of Bluetooth module to GND pin of Arduino.
  4. Interconnect all the “t1” pins of each relay and connect one of them to 220V input of main power supply.
  5. Connect any one terminal of each of the devices to be controlled to pin “t2” of each of the relays R1-R6 respectively.
  6. Connect the other remaining terminals (Ground terminals) of all the devices to be controlled to GND of the main power supply.
  7. Connect Tx of Bluetooth module to Rx of Arduino and Rx of Bluetooth module to Tx of Arduino.


The code for Arduino Uno is available here.

The Android app is available here.


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