//Nome:Estrela josé Marcolino

#define RELAY 22
#define PUSH  21 
void setup() {
  pinMode(RELAY, OUTPUT);
  pinMode(PUSH, INPUT_PULLUP);
}

void loop() {
 
 if(digitalRead(PUSH)==0){

  digitalWrite(RELAY, HIGH);
 }else{
 digitalWrite(RELAY, LOW);
 }
}