int led = 7;
int btn = 6;

void setup() {
  // put your setup code here, to run once:
pinMode(led, OUTPUT);
pinMode(btn, INPUT_PULLUP);
digitalWrite(led, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:
if (digitalRead(btn) == LOW){
  digitalWrite(led, HIGH);
  delay(1000);
  digitalWrite(led, LOW);
}

}