run this to confiugre globals for real program gist

serial test for relays

int one = 19;
int two = 20;
int three = 21;
int four = 18;


void setup() {
  // put your setup code here, to run once:
  pinMode(four, OUTPUT);
  pinMode(one, OUTPUT);
  pinMode(two, OUTPUT);
  pinMode(three, OUTPUT);
}

void loop() {
  delay(500);              // wait for a second
  digitalWrite(one, HIGH);
  delay(500);
  digitalWrite(one, LOW);
  delay(500);              // wait for a second
  digitalWrite(two, HIGH);
  delay(500);
  digitalWrite(two, LOW);
  delay(500);              // wait for a second
  digitalWrite(three, HIGH);
  delay(500);
  digitalWrite(three, LOW);
  delay(500);
  digitalWrite(four, HIGH);
  delay(500);
  digitalWrite(four, LOW);
}