Lesson 26 Dual-color LED

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Introduction

A dual-color light emitting diode (LED) is capable of emitting two different colors of light, typically red and green, rather than only one color. It is housed in a 3mm or 5mm epoxy package. It has 3 leads; common cathode or common anode is available. A dual-color LED features two LED terminals, or pins, arranged in the circuit in anti-parallel and connected by a cathode/anode. Positive voltage can be directed towards one of the LED terminals, causing that terminal to emit light of the corresponding color; when the direction of the voltage is reversed, the light of the other color is emitted. In a dual-color LED, only one of the pins can receive voltage at a time. As a result, this type of LED frequently functions as indicator lights for a variety of devices, including televisions, digital cameras, and remote controls.

Components

– 1 * SunFounder Uno board

– 1 * USB data cable

– 1 * Dual-color LED module

– 1 * 3-Pin anti-reverse cable

Experimental Principle

Control the LED brightness by the digital port. The color of the LED changes from red to green as well as flashes a mixed color.

Experimental Procedures

Step 1: Build the circuit

Step 2: Program (Please refer to the example code in LEARN -> Get Tutorial on our website)

Step 3: Compile

Step 4: Upload the sketch to SunFounder Uno board

Now, you can see the dual-color LED changes from red to green alternately, as well as flashing a mixed color during the alternation.

Code

/***************************************************
name:Dual-color LED
function:you can see the dual-color LED changes from red to green alternately,
as well as flashing a mixed color during the alternation.
connection:
Dual-color LED Uno R3
R 11
GND GND
G 10
****************************************************/
//Email:support@sunfounder.com
//website:www.sunfounder.comint redPin = 11; // select the pin for the red LED
int greenPin = 10; // select the pin for the blueLED
int val = 0;void setup()
{
  pinMode(redPin, OUTPUT); //set redPin as OUTPUT
  pinMode(greenPin, OUTPUT);//set greenPin as OUTPUT
  Serial.begin(9600);
}
/******************************************************/
void loop()
{
  for(val=255; val>0; val–) //
  {
    analogWrite(redPin, val); //red value decrease
    analogWrite(greenPin, 255-val);//green value increase
    Serial.println(val, DEC);//print the val on in serial monitor
    delay(30); //delay 30ms
  }
  for(val=0; val<255; val++)
  {
    analogWrite(redPin, val); //red value increase
    analogWrite(greenPin, 255-val);//green value decrease
    Serial.println(val, DEC);//print the val on in serial monitor
    delay(30); //delay 30ms
  }
}
/********************************************************/