byte buttonPin = 13;
byte led = 12;
byte noodknop = 11;

bool buttonState;
bool buttonStateDomotica = false;
bool noodknopState = true;

void setup() 
{
 pinMode(led, OUTPUT);
 pinMode(buttonPin, INPUT);

 Serial.begin(9600);
}

void loop() 
{
 buttonState = digitalRead(buttonPin);
 delay(150);

 if(buttonState == HIGH)
 {
   buttonStateDomotica = (!buttonStateDomotica);
   delay(10);
 }

 Serial.println(buttonStateDomotica);

 digitalWrite(led,buttonStateDomotica);
}