const int LEDR = 2;
const int LEDG = 4;
const int LEDB = 7;

const int COLOR_CHANGE_DELAY = 100;

void setup() {
 // Initialize the LED pin as an output
pinMode(LEDR, OUTPUT);
pinMode(LEDG, OUTPUT);
pinMode(LEDB, OUTPUT); }
void loop() {
 int redValue = random(256);
 int greenValue = random(256);
 int blueValue = random(256);

 analogWrite(LEDR, redValue);
 delay(COLOR_CHANGE_DELAY);
 analogWrite(LEDG, greenValue);
 delay(COLOR_CHANGE_DELAY);
 analogWrite(LEDB, blueValue);
 delay(COLOR_CHANGE_DELAY);
 }