How to Use ESP-01 ESP-01S Pins and Leds : 9 Steps - Instructables
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Tweaking4All.com - Getting started with the ESP8266 as an Arduino replacement
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An Introductory Guide to ESP8266, ESP-XX modules and NodeMCU pinout - Mechatronics Blog
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Onboard LEDs? NodeMCU's got two! – Low voltage. Mostly harmless...
