int btn1 = 17;
int btn2 = 15 ;
int btn3 = 14 ;
int btn4 = 33 ;
int btn5 = 5 ;
int btn6 = 2 ;
int btn7 = 12 ;
int btn8 = 25 ;
int btn9 = 18 ;
int btn0 = 4 ;

btn_plus = D2 ;
int btn_minus = 26;
int btn_mal = 19 ;
int btn_geteilt = 16 ;
btn_istgleich = D3; 
int btn_Komma = 27 ;



void setup() {

Serial.begin(115200);
  pinMode(btn1, OUTPUT);
  pinMode(btn2, OUTPUT);
  pinMode(btn3, OUTPUT);
  pinMode(btn4, OUTPUT);
  pinMode(btn5, OUTPUT);
  pinMode(btn6, OUTPUT);
  pinMode(btn7, OUTPUT);
  pinMode(btn8, OUTPUT);
  pinMode(btn9, OUTPUT);
  pinMode(btn0, OUTPUT);

  pinMode(btn_plus, OUTPUT);
  pinMode(btn_minus, OUTPUT);
  pinMode(btn_mal, OUTPUT);
  pinMode(btn_geteilt, OUTPUT);


  pinMode(btn1, OUTPUT);
  pinMode(btn1, OUTPUT);
  pinMode(btn1, OUTPUT);
  

  
}

void loop() {

digitalWrite(btn1, HIGH);
digitalWrite(btn2, HIGH);
digitalWrite(btn3, HIGH);
digitalWrite(btn4, HIGH);
digitalWrite(btn5, HIGH);
digitalWrite(btn6, HIGH);
digitalWrite(btn7, HIGH);
digitalWrite(btn8, HIGH);
digitalWrite(btn9, HIGH);
digitalWrite(btn1, HIGH);


}