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ArduinoNano RGB Example

RGB Example

The RGB is a Led that can produce three different light signals: Red(R),Green(G), Blue(B).
It is formed from four pins and it can have two different configurations: common cathode and common anode.
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In this example is used a RGB common Cathode and it will realize a sketch to switch on the led Red,Green and Blue alternately.

Hardware Required

  • Arduino Board
  • common cathode RGB
  • Wires
  • Breadboard
  • 3 resistors of 220 Ω

Circuit

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Connect the first pin (R) from flat side to a resistor of 220 Ω and to Pin 2 of the board, connect the second (cathode),
usually is longer than others pins, to ground (GND) of the board, connect the third pin (G) to a resistor of 220 Ω and to Pin 3 of
the board and finally connect the fourth pin (B) of RGB to a resistor of 220 Ω and to Pin 4 of the board.

Schematic

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Code

The code defines with red, green, blue the RGB pins.
It is created a function called Led_on to switch on the singles Leds.
In the setup red, blue and green are defined as OUTPUT pins.
In the loop is called the function Led_on and every second is changed the parameter supplied to the function, so it changes the led on.
NOTE:
When you use a RGB common cathode if you want to switch on the led you must write HIGH, if you want to switch off you must write LOW,
instead when you use a RGB common anode you must write in opposite mode.

/*RGB Common Cathode*/
const int red=2;
const int green=3;
const int blue=4;

void Led_on(int n){
switch(n){
case 0: digitalWrite(red, LOW);//rgb off
              digitalWrite(blue, LOW);
              digitalWrite(green, LOW);
	          break;
case 1: digitalWrite(red, HIGH);//red on
              digitalWrite(blue, LOW);
              digitalWrite(green, LOW);
	          break;
case 2: digitalWrite(red, LOW);//green on
              digitalWrite(blue, LOW);
              digitalWrite(green, HIGH);
	          break;
case 3: digitalWrite(red, LOW);//blue on
              digitalWrite(blue, HIGH);
              digitalWrite(green, LOW);
	          break;
}   
}
void setup() {
pinMode(red, OUTPUT);
pinMode(blue, OUTPUT);
pinMode(green, OUTPUT);
}
void loop(){
for(int i=0;i<=3; i++){
Led_on(i);
delay(1000);}
}


This is how the RGB Example is shown on the new Arduino Studio. Check it out!
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