void setup() {
  Serial.begin(115200);
  pinMode(D6, INPUT);
  pinMode(D7, OUTPUT);
}

void loop() {
  digitalWrite(D7, LOW);
  Serial.println(digitalRead(D6));
  if(digitalRead(D6) == HIGH){
    digitalWrite(D7, HIGH);
  }else{
    digitalWrite(D7, LOW);
  }
}