Arduino Project 12: Interactive Adjustable RGB LED

In Arduino Project 5: Color RGB LED, we learned about how to adjust an RBG LED to various colors. This time we will use this arduino starter kit to try to make it interactive by adding 3 potentiomters so that you can choose any color you want for your lighting at home.

Component

DFRduino UNO R3 (similar as Arduino UNO R3)*1
Prototype Shield *1
Jumber Cables M/M *13
Resistor 220R*3
10K Potentiometer *3
5m RGB LED*1
Circuit

Fig. 12-1 Interactive Adjustable RGB LED Circuit diagram

Code

//Sample Code 12-1:

int redPin = 9;                            // R – digital 9
int greenPin = 10;                     // G – digital 10
int bluePin = 11;                        // B – digital 11
int potRedPin = 0;                    // potentiometer 1 – analog 0
int potGreenPin = 1;                // potentiometer 2 – analog 1int potBluePin = 2;                  
int potBluePin = 2;                               // potentiometer 3 – analog 2

void setup(){
pinMode(redPin,OUTPUT);
pinMode(greenPin,OUTPUT);
pinMode(bluePin,OUTPUT);
Serial.begin(9600);                                             // Initialize the serial port
}
void loop(){
int potRed = analogRead(potRedPin); 　       // read value from potentiometer of
red LED
int potGreen = analogRead(potGreenPin);    // read value from potentiometer of
green LED
int potBlue = analogRead(potBluePin); 　     // read value from potentiometer of
blue LED
int val1 = map(potRed,0,1023,0,255); 　       //map the voltage value ranging from
0~ 1023 to analog value ranging from 0 ~255
int val2 = map(potGreen,0,1023,0,255);
int val3 = map(potBlue,0,1023,0,255);

// print value of red, green and blues LEDs from serial port
Serial.print("Red:");
Serial.print(val1);
Serial.print("Green:");
Serial.print(val2);
Serial.print("Blue:");
Serial.println(val3);
colorRGB(val1,val2,val3); // configure the analog value for RGB LED
}
}

//define the colorRGB function
void colorRGB(int red, int green, int blue){
analogWrite(redPin,constrain(red,0,255));
analogWrite(greenPin,constrain(green,0,255));
analogWrite(bluePin,constrain(blue,0,255));
}
After uploading the sketch, you can change different combinations of red, green and blue colors on the RGB LED.

Related category: arduino kits > education kits

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