int led1=5;
int led2=6;
int led3=9;
void setup() {
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
Serial.begin (9600);
}
void loop () {
if (Serial.available ()>0)
{
char V=Serial.read ();
if ( V =='A'){
Serial.println (V);
for (int V=0 ; V<=255 ; V+=1){
analogWrite(led1,V);
delay(5);
}
for (int V=0 ; V<=255 ; V+=1){
analogWrite(led2,V);
delay(5);
}
for (int V=0 ; V<=255 ; V+=1){
analogWrite(3,V);
delay(5);
}
delay(20);
for (int V=255 ; V>=0 ; V-=1){
analogWrite(led1,V);
analogWrite(led2,V);
analogWrite(led3,V);
delay(5);
}
}
} 
}