int rellay=8;


void setup() {
  // put your setup code here, to run once:
  pinMode(rellay, OUTPUT);
  Serial.begin(9600);
}
void low(){
   digitalWrite(rellay, LOW);
   Serial.println("IN is low");
}
void high(){
  digitalWrite(rellay, HIGH);
   Serial.println("IN is high");
}

void loop() {
  // put your main code here, to run repeatedly:
  high();
  delay(2000);
  low();
  delay(2000);

}