//pin led 
#define red 12
#define blue 11

void setup() 
{// led red and blue sebagai output 
 pinMode( red, OUTPUT);
 pinMode( blue, OUTPUT); 
} 

void loop() 
{
 digitalWrite(red , HIGH);      //red nyala 
 digitalWrite(blue , HIGH);    //blue nyala
 delay(1000);                 //tunggu 1 detik 
 digitalWrite(red , LOW);    //red mati
 digitalWrite(blue, LOW);   //blue mati 
 delay(1000);              // tunggu 1 detik 
          
}