Mood Lamp with Arduino

Hi! In this tutorial you will learn to make a mood lamp with arduino.
I know that you may have seen a lot of mood lamp projects with arduino, but I wasn’t very satisfied with them because they all change the color very abruptly. So, I decided to make a smooth mood lamp and I also made it to turn on only when the room is dark.
This project is good for those who are beginners in the arduino’s world.

Step 1: Material

For this instructable you are gonna need:
– Arduino
– Jumper wires
– 1 RGB LED or 1 red LED, 1 green LED and 1 blue LED
– LDR (Light Dependent Resistor)
– Protoboard
– Sheet of paper

Step 2: Time to code!

Write the code above on the Arduino program.
Darker the ambient light is, the higher is the value read from the LDR.
I used PWM to change led’s brightness.
Mood Lamp with Arduino

// Smooth RGB mood lamp
// Changes an RGB LED’s color smoothly that only turns on
// when it’s dark around it.
// Author: Ricardo Ouvina
// Date: 19/07/2012
// Version: 2.0
// —————————————————
// The brightness of the leds follows these equations:
// Red = sin(x)
// Green = sin(x + PI/3)
// Blue = sin(x + 2PI/3)
// for x from 0 to PI
// —————————————————

float RGB[3];
int ldrPin = 0;     // LDR in Analog Input 0 to read the ambient light
int ambientLight;   // variable to store the value of the ambient light
int redLed   = 11;  // red LED in Digital Pin 11 (PWM)
int greenLed = 10;  // green LED in Digital Pin 10 (PWM)
int blueLed  = 9;   // blue LED in Digital Pin 9 (PWM)

void setup(){
pinMode(redLed,OUTPUT);  // tell arduino it’s an output
pinMode(greenLed,OUTPUT);// tell arduino it’s an output
pinMode(blueLed,OUTPUT); // tell arduino it’s an output

// set all the outputs to low

void loop(){
for (float x=0;x<PI;x=x+0.00001){
RGB[0]=255*abs(sin(x*(180/PI)));           // calculate the brightness for the red led
RGB[1]=255*abs(sin((x+PI/3)*(180/PI)));    // calculate the brightness for the green led
RGB[2]=255*abs(sin((x+(2*PI)/3)*(180/PI)));// calculate the brightness for the blue led
ambientLight=analogRead(ldrPin); // read an store the ambient light
if(ambientLight>600){ // start only if the ambient light is very low
//  write the brightness on the leds
for(int i=0;i<3;i++){

Mood Lamp with Arduino circuit

This Post / Project can also be found using search terms:

  • arduino mood lamp
  • mood lamp code
  • podpi arduino with mood lamp
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