Easy way,
an RGB led with random colors that light on when light is off connected to Arduino Uno!

Color code here:

[code lang=”cpp” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”][…]
randomSeed(analogRead(0));

for (int x=0; x<3; x++) {
INC[x] = (RGB1[x] – RGB2[x]) / 256;
}

for (int x=0; x<256; x++) {
red = int(RGB1[0]);
green = int(RGB1[1]);
blue = int(RGB1[2]);

analogWrite (RedPin, red);
analogWrite (GreenPin, green);
analogWrite (BluePin, blue);
delay(10);

RGB1[0] -= INC[0];
RGB1[1] -= INC[1];
RGB1[2] -= INC[2];
}

for (int x=0; x<3; x++) {
RGB2[x] = random(556)-300;
RGB2[x] = constrain(RGB2[x], 0, 255);
delay(10);
}
[…][/code]