// Question
  String Question(String Message) {
    
    Serial.print(Message + " : ");
    while(!Serial.available());

    Message = Serial.readStringUntil('\n');
    while(Serial.available()) Serial.read();
    Message.trim();
    Serial.println(Message);
    return Message;

  }

  // OLED Display
  void oled_write(String message) {
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(SSD1306_WHITE);
    display.setCursor(0, 0);
    display.println(message);
    display.display();
  }

  // I2C Scanner
  void scanI2C() {

    byte error, address;
    int nDevices = 0;

    for(address = 1; address < 127; address++ ) {
      Wire.beginTransmission(address);
      error = Wire.endTransmission();
      if (error == 0) {
        Serial.print("I2C device found at address 0x");
        if (address<16) Serial.print("0");
        Serial.println(address, HEX);
        nDevices++;
      } else if (error==4) {
        Serial.print("Unknown error at address 0x");
        if (address<16) Serial.print("0");
        Serial.println(address, HEX);
      }
    }

    if (nDevices == 0)
      Serial.println("No I2C devices found");
    else
      Serial.println("Scan complete");

  }