Smart Home Project Using Arduino and Sensors | Makers’ Muse

Arduino Smart Home with PIR, Temperature & Gas Sensors | Makers’ Muse

This project is about smart homes, which are going to be the future. In these homes, we don’t have to switch ON/OFF the fan and lights whenever the temperature of the room goes below the threshold value. The fan will get switched on, and when you enter from the door lights will turn on automatically.

In this smart home, the PIR sensor is used for a light and temperature sensor, and for the temperature and gas sensor to detect fire and to sound an alarm.

Hardware required 

• Arduino Uno R3
• Resistor
• Jumper Wires
• DC motor
• Buzzer
• Gas Sensor
• NPN transistor
• Temperature Sensor
• Light Bulb
• PIR Sensor
• Breadboard

Schematic Diagram

Fig 1.  Circuit Diagram

Arduino Code :

const int LM35 = A0;
const int motor = 13;
const int bulb = 12;
int inputPin = 2;              
int pirState = LOW;             
int val = 0;
int buzzer = 10;
int smokeA1 = A5;
int sensorThres = 300;

void setup() {
  Serial.begin(9600);
  pinMode(motor, OUTPUT);
  pinMode(bulb, OUTPUT);
  pinMode(inputPin, INPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(smokeA1, INPUT);
  delay(2000);
  
  }

void loop() {

  int value = analogRead(LM35);
  float Temperature = value * 500.0 / 1024.0;
  

  {
  val = digitalRead(inputPin);  
  if (val == HIGH) {           
    if (pirState == LOW) {
      digitalWrite(bulb, LOW);                              
      pirState = HIGH;
    }
  } 
  else {
    if (pirState == HIGH){
        digitalWrite(bulb, HIGH);                                   
      pirState = LOW;
    }
  }
}
    
  if (Temperature > 50){
    digitalWrite(motor, HIGH);

  }
  else {
    digitalWrite(motor, LOW);

  }
  
   delay(1000);
  
  
  
  int analogSensor = analogRead(smokeA1);
  Serial.print("Pin A1: ");
  Serial.println(analogSensor);
  if (analogSensor > sensorThres)
    
    {
      tone(buzzer, 1000, 200);
    }
  else
    {
      noTone(buzzer);
    }
  delay(100);
}

Precautions

1. Connections should be made properly.
2. Arduino is case Sensitive, so code accordingly.
3. Give different and appropriate colours to the wires.
4. Use resistors for sensors and LCDs.

Conclusion:

The Smart Home Project using Arduino shows how automation can improve safety, comfort, and efficiency. With sensors like PIR for motion, LM35 for temperature, and a gas sensor for fire detection, this system makes everyday living smarter and safer.

At Makers’ Muse, we believe hands-on projects build future innovators. Start your learning journey and master real-world applications with coding schools, where you can explore Arduino, IoT, and beyond to shape the homes of tomorrow.