AZDelivery ESP8266 ESP-12F NodeMCU Amica V2, Modulo WiFi IoT con CP2102, Placa de Desarrollo Compatible con Arduino con E-Book Incluido! : Amazon.es: Informática
MODULO ESP8266 ESP-01 WIFI IOT
ESP8266 Node MCU board specifications and pins descriptions. Frequently asked questions related to WI-FI board esp8266 node MCU
ESP8266 - Wikipedia, la enciclopedia libre
How to upgrade your ESP8266 memory to 4MB (in under 2 minutes) - YouTube
ESP-03 Upgrade Flash Memory to 128 M Bit : 10 Steps - Instructables