#define RELAY 22
#define PUSH 21
void setup() {
  // put your setup code here, to run once:
  pinMode(RELAY, OUTPUT); 
  pinMode(PUSH, INPUT_PULLUP); 
}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(PUSH) == 0){
    digitalWrite(RELAY, HIGH);
  }
  else{
    digitalWrite(RELAY, LOW);
  }

  /*digitalWrite(RELAY, HIGH);
  delay(500);
  digitalWrite(RELAY, LOW);
  delay(500); // this speeds up the simulation*/
}