Onboard LEDs? NodeMCU's got two! – Low voltage. Mostly harmless...
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Getting started with ESP32: How to Program ESP32 using Arduino IDE to Blink an LED
Getting started with ESP32: How to Program ESP32 using Arduino IDE to Blink an LED
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ESP32-DevKitC V4 Getting Started Guide - ESP32 - — ESP-IDF Programming Guide latest documentation
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ESP32 LED Blink Example | Circuits4you.com
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IoT ESP32 Workshop
ESP32 - Wikipedia
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Onboard LED blink – WiFi LoRa ESP32 (heltec)
