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‎examples/02.Digital/BlinkWithoutDelay/BlinkWithoutDelay.ino

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can run at the same time without being interrupted by the LED code.
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The circuit:
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* LED attached from pin 13 to ground.
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* Note: on most Arduinos, there is already an LED on the board
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that's attached to pin 13, so no hardware is needed for this example.
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* Use the onboard LED.
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* Note: Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
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it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
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the correct LED pin independent of which board is used.
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If you want to know what pin the on-board LED is connected to on your Arduino model, check
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the Technical Specs of your board at https://www.arduino.cc/en/Main/Products
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created 2005
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by David A. Mellis

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