Instructions

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int redpin = 11; // sets pin 11 for red LED
int bluepin =10; // sets pin 10 for blue LED
int greenpin =9; // sets pin 9 for green LED
int val;
void setup() {
pinMode(redpin, OUTPUT);
pinMode(bluepin, OUTPUT);
pinMode(greenpin, OUTPUT);
Serial.begin(9600);
}
void loop() {
for(val=255; val>0; val--) {
analogWrite(11, val);
analogWrite(10, 255-val);
analogWrite(9, 128-val);
delay(1);
}
for(val=0; val<255; val++) {
analogWrite(11, val);
analogWrite(10, 255-val);
analogWrite(9, 128-val);
delay(1);
}
Serial.println(val, DEC);
}