Arduino in-built LED is not turning off - Arduino Stack Exchange
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What is an Arduino? Learn Arduino with Arduino Point
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Using the built-in LED with INPUT_PULLUP - Arduino Video Tutorial | LinkedIn Learning, formerly Lynda.com
Arduino Nano RP2040 Connect Review: Built-in Wi-Fi and BLE | Tom's Hardware
Robots For Fun
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Arduino Mega 2560 onboard LED L does not blink - LEDs and Multiplexing - Arduino Forum
Blink | Arduino Documentation | Arduino Documentation
c++ - Tinkercad Circuit: How to Make the Built-in LED and LED light up through a push button - Stack Overflow
