const int buttonPin = 8;
const int ledPin = 9;
int buttonState;
int dt = 200;
void setup() {
  Serial.begin(9600);
  pinMode(buttonPin , INPUT_PULLUP);
  pinMode(ledPin,OUTPUT);

}
void loop() {
 buttonState = digitalRead(buttonPin);
 Serial.print("buttonState =");
 Serial.println(buttonState);

 if (buttonState == LOW ){
  Serial.println("Button is NOT PRESSED");
  digitalWrite(ledPin, LOW);
  }

 else {
  Serial.println("Button is PRESSED");
  digitalWrite(ledPin, HIGH);
  delay(1000);
 }
    
delay(dt);
}