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1. ButtonState ButtonState

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   int currentState = HIGH;

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   int previousState = HIGH;

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   void setup() {

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     Serial.begin(9600);

2. Arduino: Toggle a LED with a single ... Arduino: Toggle a LED with a single button On/Off

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   const int buttonPin = 2;

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   const int ledPin = 11;

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   int currState = HIGH;

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   int prevState = HIGH;