Led Lamp

this is a lamp that is easy to make!!!!!!

Step 1: What You Need

1) Jumper wires

2) LED

3) LDR

4) Aurdino

Step 2: Code

// 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

digitalWrite(redLed,LOW);

digitalWrite(greenLed,LOW);

digitalWrite(blueLed,LOW);

}

void loop(){

for (float x=0;x

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

analogWrite(redLed,RGB[0]);

analogWrite(greenLed,RGB[1]);

analogWrite(blueLed,RGB[2]);

}

else{

digitalWrite(redLed,LOW);

digitalWrite(greenLed,LOW);

digitalWrite(blueLed,LOW);

}

for(int i=0;i<3;i++){

if(RGB[i]<1){

delay(100);

}

if(RGB[i]<5){

delay(50);

}

if(RGB[i]<10){

delay(10);

}

if(RGB[i]<100){

delay(5);

}

}

delay(1);

}

}

Step 3: