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跑马灯

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int redpin = 11; //select the pin for the red LED
int bluepin =10; // select the pin for the blue LED
int greenpin =9;// select the pin for the 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);
 }