int led=9;
bool ledState = true; // Boolean to track the LED state (ON/OFF)
void setup() {
  Serial.begin(9600);
pinMode(led, OUTPUT); // Set the LED pin as an output
}
void loop(){
  if(ledState==true){
    digitalWrite(led, HIGH);
    delay(100);
    Serial.println(ledState);
    ledState=false;
  }
  if(ledState==false){
digitalWrite(led,LOW);
delay(100);
Serial.println(ledState);
ledState=true;
  }
}