#define pinLed 8
#define pinButton 2
bool stateButton=LOW;
void setup() {
 pinMode(pinLed,OUTPUT);
 pinMode(pinButton, INPUT_PULLUP);
 Serial.begin(9600);
}
void loop() {
  if(digitalRead(pinButton)==LOW){stateButton=!stateButton;
  delay(400);}

  digitalWrite(pinLed,stateButton);
  Serial.print(stateButton);
 
}