const int led = 4;
int sensor = 8;

void setup() {
  // put your setup code here, to run once:
pinMode(led, OUTPUT);
pinMode(sensor, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
int x = digitalRead(sensor);
if (x== HIGH)
{
  digitalWrite(led, HIGH);
  delay (5000);
}
else
{
  digitalWrite(led, LOW);
}

}