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Explean: 1-When connecting a button to Arduino, explain why a pull down resistor is required for...

Explean:

1-When connecting a button to Arduino, explain why a pull down resistor is required for correct operation?

2-digitalWritre (pin, state): have mention what type of value the variable state and pin can take?

3-Briefly explain the purpose of setup()and loop()function in an Arduino program?

4-Briefly explain what comparator does?

5- Briefly explain how button debouneing can affect the input read from Arduino?

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