NodeMCU/ESP8266: get ESP chip and flash info

Simple sketch run on NodeMCU/ESP8266 to get chip and flash info.

ESP_GetFlashSize.ino

//reference: 
//http://esp8266.github.io/Arduino/versions/2.1.0/doc/libraries.html

void setup() {
  Serial.begin(9600);
  Serial.println();
  Serial.println();

  Serial.println("http://arduino-er.blogspot.com/");
  Serial.println("ESP chip and flash info");
  Serial.printf("The ESP8266 chip ID as a 32-bit integer:\t%08X\n", ESP.getChipId());
  Serial.printf("The flash chip ID as a 32-bit integer:\t\t%08X\n", ESP.getFlashChipId());
  Serial.printf("Flash chip frequency:\t\t\t\t%d (Hz)\n", ESP.getFlashChipSpeed());

  /* ESP.getFlashChipSize() returns the flash chip size, in bytes, 
   * as seen by the SDK (may be less than actual size).
   */
  Serial.printf("Flash chip size:\t\t\t\t%d (bytes)\n", ESP.getFlashChipSize());

  Serial.printf("Free heap size:\t\t\t\t\t%d (bytes)\n", ESP.getFreeHeap());

  
}

void loop() {
  

}

Tested on NodeMCU 1.0: