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ESP8266 Tutorial: Programming the Onboard GPIO Pins -
NodeMCU Basic Project-Blink a LED - Instructables
Beginner: External Wired Button Controlling Onboard LED - Everything ESP8266
NodeMCU Tutorial Series Part I: Arduino IDE and Blinking an LED — Maker Portal
Blink LED on ESP8266 | ezContents blog
ESP8266-01 Led Blink standalone using GPIO 2 pin - Project Guidance - Arduino Forum
NODEMCU–Getting Started with Arduino Core 1. GPIO pins & Network Access | alselectro
Devon P. Hubner
