Published November 18, 2021

Night Lamp

My study table needed a night lamp, so I designed one myself.

IntermediateShowcase (no instructions)3 hours250

Things used in this project

Hardware components

Ultrasonic Sensor - HC-SR04 (Generic)

Arduino UNO

RGB Diffused Common Cathode

Photo resistor

Resistor 221 ohm

Resistor 1k ohm

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)

Solder Wire, Lead Free

Story

Ever wondered how wonderful it will be if you come up near your study table to look for something when your room lights are switched off and suddenly your table lamp glows up and gives off enough light for your search purpose. Wouldn't that be great?

Or think about having a night lamp which glows as long as you're working on your table and thereby saves you from the trouble of switching off lights when you get up.

My project exactly fills in the gap for such necessities.

Came up with this amazing idea when I found a broken tripod stand in my collection of junks and I always wanted an automatic object detector night lamp.

This uses a photoresistor to detect the light intensity of the room.

If lightintensityof the room <conditionedintensity

The ultrasonic sensor(HCSR04) starts detecting for objects by sending ultrasonic pulse signal.

Using

distance=speed*time

We find out the distance constantly.

if an object comes close to its field of vision, it lights up the RGB LED.

We also have programmed the code in such a way, that the light glows differently for objects at different distances.

Hope you will like the project.

1 / 3

Code

Night Lamp code

// C++ code
//
int photores=A2;
int potval;


int trig=6;
int echo=7;
int traveltime;
double dist;


int redp=11;
int bluep=3;
int greenp=10;

void setup()
{
  pinMode(photores,INPUT);
  
  pinMode(trig, OUTPUT);
  pinMode(echo,INPUT);
  pinMode(redp, OUTPUT);
  pinMode(greenp, OUTPUT);
  pinMode(bluep, OUTPUT);
  Serial.begin(9600);
}

void loop()
{
   potval=analogRead(photores);
  //Serial.println(analogRead(photores));
  Serial.println(potval);
  if(potval>950)
  {  
    digitalWrite(trig, LOW);
    delayMicroseconds(10); // Wait for 1000 millisecond(s)
    digitalWrite(trig,HIGH);
    delayMicroseconds(10);
    digitalWrite(trig, LOW);
    traveltime=pulseIn(echo,HIGH);
    delay (400);
    Serial.print("traveltime = ");
    Serial.println(traveltime);
    dist=traveltime*330./20000.;
    Serial.print("distance = ");
    Serial.println(dist);
    


    digitalWrite(redp,LOW);
    digitalWrite(greenp,LOW);
    digitalWrite(bluep,LOW);
      if(dist<50)
      {
          analogWrite(redp,250);
          analogWrite(greenp,250);
          analogWrite(bluep,250);
         
         delay (1000);
      }
      else if(dist <64 && dist>50)
      {
        //yellow lights
        analogWrite(redp,239);
         analogWrite(greenp,208);
         analogWrite(bluep,10);
      
      delay (1000);
      }
  }
  else
  { 
    digitalWrite(redp,LOW);
    digitalWrite(greenp,LOW);
    digitalWrite(bluep,LOW);
  }
}

Night Lamp

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Schematics

Schematic for night lamp

Code

Night Lamp code

Credits

Abhirup Kabiraj

Comments

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Night Lamp

Night Lamp

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Schematics

Schematic for night lamp

Code

Night Lamp code

Credits

Abhirup Kabiraj

Comments

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