AVR_Smart_Home

This project is a microcontroller-based smart home automation system featuring an integrated security system, temperature control, and lighting automation. The system is designed to provide enhanced security with a password-protected door mechanism, automatic fan control based on temperature, and automatic adjustment of lighting intensity based on ambient light conditions.

Features

Security System:

• Password-protected door locking and unlocking mechanism.
• Password is stored in EEPROM and communicated using I2C protocol.
• Visitors can enter a password via a keypad or UART interface.
• A counter tracks incorrect password attempts, and after 3 wrong attempts, an alarm (buzzer) is triggered.

Environmental Control:

Fan Automation:

• A DC motor is used as a fan, which turns on automatically if the temperature exceeds 20°C.
• Temperature is monitored using an ADC (Analog-to-Digital Converter).
• The fan can also be controlled manually via a button.

Lighting Automation:

• LED lights' intensity is adjusted automatically based on ambient light levels (measured in lux).
• If the light level exceeds 140 lux, the LED intensity decreases; otherwise, full intensity is maintained.

Other Components:

• LCD screen for password entry and messages.
• Servo motor-controlled door mechanism.
• Buzzer for alert signals after incorrect password entries.
• Potentiometer for manual adjustments of fan speed.

Components Used:

• Microcontroller Unit (MCU)
• EEPROM (for password storage)
• Keypad (for user input)
• Servo motor (for door mechanism)
• DC motor (for fan control)
• LEDs (for lighting control)
• 7-segment display (for incorrect password attempts)
• Buzzer (for security alert)
• Temperature sensor
• Ambient light sensor (lux measurement)
• Potentiometer (for manual adjustments)
• LCD Display

Control Logic:

• The system uses interrupts for doorbell handling and password entry.
• Incorrect password attempts are counted and displayed on a 7-segment display.
• When the correct password is entered, the door unlocks using a servo motor.
• The fan turns on if the temperature exceeds 20°C and can be manually turned off with a button.
• Light intensity is adjusted using PWM (Pulse Width Modulation) based on the ambient light levels.

Getting Started:

1. Clone this repository.
2. Connect the components as per the flowchart.
3. Upload the firmware to the microcontroller.

How to Use:

• Set the password on the first start, which will be stored in EEPROM.
• Use the keypad to enter the password and unlock the door.
• The fan will automatically turn on or off based on the temperature.
• The LED lights will adjust their intensity based on the room's ambient lighting.