#define led1 8
#define led2 5
void setup() 
{
pinMode(led1,OUTPUT);
pinMode(led2,OUTPUT);
Serial.begin(9600);
}
void loop() 
{
digitalWrite(led1,HIGH);
digitalWrite(led2,LOW);
Serial.println("my led1 is ON");
Serial.println("my led2 is OFF");
delay(4000);
digitalWrite(led1,LOW);
digitalWrite(led2,HIGH);
Serial.println("my led1 is OFF");
Serial.println("my led2 is ON");
delay(4000);  
}