int tw = 100;
int Merah = 2 ;
int Biru = 3;
int jk = 5 ,abc , Nyala=1, Mati=0;

void setup() {
pinMode(Merah,OUTPUT);
pinMode(Biru,OUTPUT);

}

void loop() {
for (abc =1;abc = jk ;abc ++){digitalWrite(Merah ,Nyala ); delay(tw);}
for (abc =1;abc = jk ;abc ++){digitalWrite(Merah ,Mati ); delay(tw);}
for (abc =1;abc = jk ;abc ++){digitalWrite(Biru ,Nyala ); delay(tw);}
for (abc =1;abc = jk ;abc ++){digitalWrite(Biru ,Mati ); delay(tw);}

delay(tw);
}