int led1 = 4;
int button1 = 5;

void setup() {
  pinMode(led1, OUTPUT);
  pinMode(button1, INPUT);
 
}

void loop() {

  int value1 = digitalRead(button1);

  if(value1 == 0){
    digitalWrite(led1, HIGH);
  } else if(value1 == 1){
    digitalWrite(led1, LOW);
  }

}