Published September 29, 2021

Energy Efficient Light Bulb

A smart light bulb, which will turn on only when it's required. And avoid wastage of electricity.

BeginnerProtip90

Things used in this project

Hardware components

Arduino UNO

LED Light Bulb, Frosted GLS

LDR, 5 Mohm

PIR Sensor, 7 m

Power Relay, SPDT

Slide Switch

Story

We need electricity in almost every work in our daily life. But sometimes there is a wastage of electricity e.g. we just keep the light bulbs and fan on even if it's not needed. So we have created this project to avoid electricity wastage.

In this project, we have used a light sensor and motion sensor. The light bulb will on only when there is darkness and human presence is detected. Otherwise, the light bulb will be off, in order to avoid the wastage of electricity.

Code

Energy Efficient Light Bulb

void setup()
{
  pinMode(2, INPUT);
  pinMode(4, OUTPUT);
  pinMode(6, INPUT);
  pinMode(A5, INPUT);
  
  Serial.begin(9600);
}

void loop()
{
  int sv = digitalRead(6);
  int lv = analogRead(A5);
  int mv = digitalRead(2);
  
  Serial.println(mv);
  
  if(sv==0)  //switch is off  
  {
    if(lv>1000)    //sunlight is absent
    {
      if(mv==1)   //motion detected
      {
        digitalWrite(4,LOW);  //light bulb turns on
      }
      else   //motion is not detected
      {
        digitalWrite(4,HIGH);   //light bulb turns off
      }
    }
  }
  else  // switch is on
  {
    if(mv==1)    //motion is detected
    {
      digitalWrite(4,LOW);  //light bulb turns on
    } 
    else  //motion is not detected
    {
      digitalWrite(4,HIGH);   //light bulb turns off
    }
  }
}

Credits

info

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Energy Efficient Light Bulb

Things used in this project

Hardware components

Story

Schematics

Smart Bulb

Code