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Smart Home Automation using AVR


Table of Contents:

  1. Smart Home Automation using AVR
  2. Working Principle and Circuit
Ashish Sharma
Ashish Sharma


In this technological world, automatic systems are being preferred over manual system. In this series Home Automation plays an important role for humans. In this unit we talk about basic needs to understand the project well and also for its future advancements.

We are going to talk about different types of sensors (i.e. Temperature Sensor, LPG Gas Sensor, LDR) and input and output devices (i.e. 2x2 matrix Keypad, Buzzer, DC Motor, 16x2 Char LCD Display, Power Supply section etc.). Now we are going to Interface all those with the brain of the system ‘Microcontroller (i.e. ATmega16/16L)’ and let’s find out what the individual role of each component are and how they act as Smart Home System together.


Smart Home Automation



It senses the leakage of LPG. The out put of this sensor is ‘high’ at normal condition. The output goes low, when it senses the LPG.


It is the whole control of the project. It controls the DC Motor, Buzzer and when LPG leak occurs, Temperature increases etc. The input/ output ports of the microcontroller is used for this.


LDR is used to check Sun light intensity; so that we can know it is Day or Night.

LM35 Temp Sensor

It is used to measure room temperature and give it to microcontroller for desirable action.

16x2 Char LCD Display

It is used to display all sensors’ value and action taken by system on display.

2x2 Matrix Keypad

It is used for enter password to access the door.

DC Motor

It is used for opening and closing the door.

File Attachment: 

Circuit Diagram

Comments (3)

hey I am aleady a member but

hey I am aleady a member but still I unable to open these files it keeps telling me that "You can not see any Code/Circuit as a free user." and am subscibe for half yearly.

What is wrong can someone tell me



Drop an email to

Drop an email to

sir, i tried to implement

sir, i tried to implement your project in bread board, i couldn't get anything ,even LCD displayed nothing.but, when i simulate the circuit on proteus,o/p obtained except for keypad.pls help me...

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