int led1 = 23;
// I have a variable  name led1
// Its value is 23
void setup() {
  // put your setup code here, to run once:
  pinMode(led1, OUTPUT);
}

void loop() {
  // put your setup code here,to run repeatedly:
  digitalWrite(led1, HIGH);
  delay(200);
  digitalWrite(led1, LOW);
  delay(200);
}