RGB Camera Backlight Control With Android Mobile

RGB lights Compaing three LED lights Red,Green & Blue. We adjust the brightness of the LED and it creates new colours. So the LED adjusting brightness is done using codes(0-255).

• As the LEDs are very close to each other, we can only see the final colors result rather than the three colors individually.

• To have an idea on how to combine the colors, take a look at the following chart. This is the simplest color mixing chart, there are more complex color charts on the web.

• RGB LEDs have 4 pins which can be distinguished by their length. The longest one is the ground (-) or voltage (+) depending if it is a common cathode or common anode LED, respectively.

RGB LED is a combination of 3 LEDs in just one package:

• 1x Red LED

• 1x Green LED

• 1x Blue LED

The color produced bythe RGB LED is a combination of the colors of each one of these three LEDs.

Mixing colors

To produce other colors, you can combine the three colors in different intensities. To generate different colors you can use PWM to adjust the brightness of each LED. As the LEDs are very close to each other, we can only see the final colors result rather than the three colors individually.

  R     G     B
(255,255,255)= White color

The 255 is full brightness of the led light

RGB LED Two Types:

RGB LED BLINK:

int redPin = 11;
int greenPin = 10;
int bluePin = 9;
void setup()
{
 pinMode(redPin, OUTPUT);
 pinMode(greenPin, OUTPUT);
 pinMode(bluePin, OUTPUT);  
}
void loop()
{
 setColor(255, 0, 0);  // red
 delay(1000);
 setColor(0, 255, 0);  // green
 delay(1000);
 setColor(0, 0, 255);  // blue
 delay(1000);
 setColor(255, 255, 0);  // yellow
 delay(1000);  
 setColor(80, 0, 80);  // purple
 delay(1000);
 setColor(0, 255, 255);  // aqua
 delay(1000);
}
void setColor(int red, int green, int blue)
{
 #ifdef COMMON_ANODE
   red = 255 - red;
   green = 255 - green;
   blue = 255 - blue;
 #endif
 analogWrite(redPin, red);
 analogWrite(greenPin, green);
 analogWrite(bluePin, blue);  
}

Arduino Uno using Bluetooth RGB Controller:

int color =0;
int red = 12;
int green =11;
int blue =10;
char received;
void setup() {
 Serial.begin(9600);
 pinMode(red, OUTPUT);
 pinMode(green, OUTPUT);
 pinMode(blue, OUTPUT);
analogWrite(red,0);
analogWrite(green,0);
analogWrite(blue,0);
}
void loop(){
   if(Serial.available()>0){
   color = Serial.read();
   char Rec = char(color);
   if (Rec != '0')
   {
   Serial.println(Rec); 
   }  
 } 
 //Black
 if (color == 'B')
 {
   analogWrite(red,0);
   analogWrite(green,0);
   analogWrite(blue,0);
 }
  //WHITE
 if (color == 'W')
 {
   analogWrite(red,255);
   analogWrite(green,255);
   analogWrite(blue,255);
 }
  //RED
 if (color == 'R')
 {
   analogWrite(red,255);
   analogWrite(green,0);
   analogWrite(blue,0);
 }
  //LIME
 if (color == 'L')
 {
   analogWrite(red,0);
   analogWrite(green,255);
   analogWrite(blue,0);
 }
  //BlUE
 if (color == 'E')
 {
   analogWrite(red,0);
   analogWrite(green,0);
   analogWrite(blue,255);
 }
  //Yellow
 if (color == 'Y')
 {
   analogWrite(red,255);
   analogWrite(green,255);
   analogWrite(blue,0);
 }
  //Cyan/Aqua
 if (color == 'C')
 {
   analogWrite(red,0);
   analogWrite(green,255);
   analogWrite(blue,255);
 }
  //Magenta / Fuchsia
 if (color == 'M')
 {
   analogWrite(red,255);
   analogWrite(green,0);
   analogWrite(blue,255);
 }
  // Maroon
 if (color == 'F')
 {
   analogWrite(red,128);
   analogWrite(green,0);
   analogWrite(blue,0);
 }
  // Olive
 if (color == 'O')
 {
   analogWrite(red,128);
   analogWrite(green,128);
   analogWrite(blue,0);
 }
  //Green
 if (color == 'G')
 {
   analogWrite(red,0);
   analogWrite(green,128);
   analogWrite(blue,0);
 }
  // Purple
 if (color == 'P')
 {
   analogWrite(red,128);
   analogWrite(green,0);
   analogWrite(blue,128);
 }
  //  Navy
 if (color == 'N')
 {
   analogWrite(red,0);
   analogWrite(green,0);
   analogWrite(blue,128);
 }
  //light coral
 if (color == 'J')
 {
   analogWrite(red,240);
   analogWrite(green,128);
   analogWrite(blue,128);
 }
  //orange red
 if (color == 'X')
 {
   analogWrite(red,255);
   analogWrite(green,69);
   analogWrite(blue,0);
 }
  //green yellow
 if (color == 'G')
 {
   analogWrite(red,173);
   analogWrite(green,255);
   analogWrite(blue,47);
 }
  // spring green
 if (color == 'S')
 {
   analogWrite(red,0);
   analogWrite(green,255);
   analogWrite(blue,127);
 }
  //   aqua marine
 if (color == 'A')
 {
   analogWrite(red,127);
   analogWrite(green,255);
   analogWrite(blue,212);
 }
  //   hot pink
 if (color == 'H')
 {
   analogWrite(red,255);
   analogWrite(green,105);
   analogWrite(blue,180);
 }
  // honeydew
 if (color == 'D')
 {
   analogWrite(red,240);
   analogWrite(green,255);
   analogWrite(blue,240);
 }
  // light gray / light grey
 if (color == 'U')
 {
   analogWrite(red,211);
   analogWrite(green,211);
   analogWrite(blue,211);
 }
}

Arduino Nano using Bluetooth RGB Controller: