ADC_MODE(ADC_VCC);//Set the ADCC to read supply voltage.

void printValue(char* text, float value) {
  Serial.print(text);
  Serial.println(value);
}
void printValue(char* text, String value) {
  Serial.print(text);
  Serial.println(value);
}

void readAndPrintEspValues() {
  printValue("Spannungsversorgung: ", ESP.getVcc());
  printValue("Free heap: ", ESP.getFreeHeap());
  printValue("Chip ID: ", ESP.getChipId());
  printValue("SDK Version: ", ESP.getSdkVersion());
  printValue("Core Version: ", ESP.getCoreVersion());
  printValue("Boot Version: ", ESP.getBootVersion());
  printValue("Boot Mode: ", ESP.getBootMode());
  printValue("CPU Frequenz MHz", ESP.getCpuFreqMHz());
  printValue("Flash Chip ID: ", ESP.getFlashChipId());
  printValue("Flash Chip real size: ", ESP.getFlashChipRealSize());
  printValue("Flash Chip size: ", ESP.getFlashChipSize());
  printValue("Flash Chip mode: ", ESP.getFlashChipMode());
  printValue("Sketch Size: ", ESP.getSketchSize());
  printValue("Skatch MD5: ", ESP.getSketchMD5());
  printValue("Free sketch space: ", ESP.getFreeSketchSpace());
}

void setup() {
  // Setup console
  Serial.begin(115200);
  Serial.println("Booting");
  readAndPrintEspValues();
}

void loop() {
}