void setup() { // put your setup code here, to run once: pinMode(3, OUTPUT); pinMode(4, OUTPUT); pinMode(5, OUTPUT); pinMode(6, OUTPUT); } void loop() { int colour[] = {255, 0, 255}; digitalWrite(3, (255 - colour[0])*HIGH); digitalWrite(4, HIGH); digitalWrite(5, (255 - colour[1])*HIGH); digitalWrite(6, (255 - colour[2])*HIGH); }