ควบคุมการเปลี่ยนสี RGB LED โดยปรับค่าความต้านทาน

// RGB LED - Color Control With Potentiometers
//
// Matthew L Beckler 
// matthew at mbeckler dot org

int redPin = 11;
int bluePin = 10;
int greenPin = 9;

int redIn = 0;
int greenIn = 1;
int blueIn = 2;

int redVal;
int greenVal;
int blueVal;

void setup()
{
// nothing to do here
}

void loop()
{
redVal = analogRead(redIn);
greenVal = analogRead(greenIn);
blueVal = analogRead(blueIn);

// analogRead returns a value between 0 and 1023
// analogWrite wants a value between 0 and 255
// That means we need to map the input range to
// the correct output range.
redVal = map(redVal, 0, 1023, 0, 255);
greenVal = map(greenVal, 0, 1023, 0, 255);
blueVal = map(blueVal, 0, 1023, 0, 255);

analogWrite(redPin, redVal);
analogWrite(greenPin, greenVal);
analogWrite(bluePin, blueVal);
}