int SOLENOID = 8;

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin SOLENOID as an output.
  pinMode(SOLENOID, OUTPUT); 
}

// the loop function runs over and over again forever
void loop() {
    digitalWrite(SOLENOID, HIGH); 
    delay(1000);  // Wait for 1 seconds
    digitalWrite(SOLENOID, LOW);
    delay(1000);  // Wait for 1 seconds
}