Lチカ

/*
 ESP8266 Blink by Simon Peter
 Blink the blue LED on the ESP-01 module
 This example code is in the public domain
 
 The blue LED on the ESP-01 module is connected to GPIO1 
 (which is also the TXD pin; so we cannot use Serial.print() at the same time)
 
 Note that this sketch uses LED_BUILTIN to find the pin with the internal LED
*/

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);     // Initialize the LED_BUILTIN pin as an output
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, LOW);   // Turn the LED on (Note that LOW is the voltage level
                                    // but actually the LED is on; this is because 
                                    // it is active low on the ESP-01)
  delay(3000);                      // Wait for a second
  digitalWrite(LED_BUILTIN, HIGH);  // Turn the LED off by making the voltage HIGH
  delay(2000);                      // Wait for two seconds (to demonstrate the active low LED)
}

error: espcomm_open failed
error: espcomm_upload_mem failed
error: espcomm_upload_mem failed

FLAHボタンを押しながらリセットで書き込みモードに入る
それでもダメならFLASHボタンおしっぱなし

参考

Arduino IDE に Stable ( Staging )版 ESP8266 ボードをインストールする方法 | mgo-tec電子工作

Comparison of ESP8266 NodeMCU development boards • my2cents

NodeMCUを使ってみる

Espressif ESP8266 Arduino互換でスケッチが使える ESP-12Eモジュール基板 (Espressif ESP8266 ESP-12-E NodeMCU V1 ESP12 CP2102)