#define BUTTON 22
#define LED 21
bool Ledstate = 0;


void setup() {
  pinMode(BUTTON, INPUT);
  pinMode(LED, OUTPUT);

}

void loop() {
  if ((digitalRead(BUTTON) == 1)){
    //while((digitalRead(BUTTON) == 1)){}
    Ledstate = !Ledstate;
    digitalWrite(LED,Ledstate);
  }
  delay(10);
}