【arduino】小白求教@飘雪才子

哪位大哥（@飘雪才子）能帮个忙，我想给在这程序基础上加一个能在电脑上显示颜色的程序，这个怎么弄啊？
int s0=3,s1=4,s2=5,s3=6;
int flag=0;
int counter=0;
int countR=0,countG=0,countB=0;
void setup()
{
Serial.begin(115200);
pinMode(s0,OUTPUT);
pinMode(s1,OUTPUT);
pinMode(s2,OUTPUT);
pinMode(s3,OUTPUT);
pinMode(8,OUTPUT);
pinMode(9,OUTPUT);
}
void TCS()
{
digitalWrite(s1,HIGH);
digitalWrite(s0,LOW);
flag=0;
attachInterrupt(0, ISR_INTO, CHANGE);
timer2_init();
}
void ISR_INTO()
{
counter++;
}
void timer2_init(void)
{
TCCR2A=0x00;
TCCR2B=0x07; //the clock frequency source 1024 points
TCNT2= 100; //10 ms overflow again
TIMSK2 = 0x01; //allow interrupt
}
int i=0;
ISR(TIMER2_OVF_vect)//the timer 2, 10ms interrupt overflow again. Internal overflow interrupt executive function
{
TCNT2=100;
flag++;
if(flag==1)
{
counter=0;
}
else if(flag==2)
{
digitalWrite(s2,LOW);
digitalWrite(s3,LOW);
countR=counter/1.051;
Serial.print("red=");
Serial.println(countR,DEC);
digitalWrite(s2,HIGH);
digitalWrite(s3,HIGH);
}
else if(flag==3)
{
countG=counter/1.0157;
Serial.print("green=");
Serial.println(countG,DEC);
digitalWrite(s2,LOW);
digitalWrite(s3,HIGH);
}
else if(flag==4)
{
countB=counter/1.114;
Serial.print("blue=");
Serial.println(countB,DEC);
digitalWrite(s2,LOW);
digitalWrite(s3,LOW);
}
else
{
flag=0;
TIMSK2 = 0x00;
}
counter=0;
delay(2);
}
void loop()
{
delay(10);
TCS();
if((countR>10)||(countG>10)||(countB>10))
{
if((countR>countG)&&(countR>countB))
{
Serial.println("red");
digitalWrite(8,HIGH);
delay(1500);
digitalWrite(8,LOW);
delay(1000);
}
else if((countG>=countR)&&(countG>countB))
{
Serial.println("green");
digitalWrite(9,HIGH);
delay(1500);
digitalWrite(9,LOW);
delay(1000);
}
else if((countB>countG)&&(countB>countR))
{
Serial.println("blue");
digitalWrite(9,HIGH);
delay(1500);
digitalWrite(9,LOW);
delay(1000);
}
}
else
{
delay(1000);
}
}