For his example image, [CNLohr] has a few WS2812 RGB LEDs connected to the ESP8266 WiFi module. Uploading the image turns the LEDs into something controllable with UDP packets on port 7777.
This pin is on the rear of the ESP8266 module, and on many development boards, it isn’t even connected. That’s because its internally hooked up to the ESP8266’s SPI flash chip, and using it ...
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