Note: When not using the built-in pull-up resistor on a pin, you will need to add a pull-down or pull-up resistor yourself, depending on your type of switch. Most digital signals can be used without ...

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When reed switch is opened, pin 2 of Arduino goes high with the help of the pull-up resistor R2, and the alert signal is available through the piezo-speaker PZ1 (not an active piezo-buzzer). At the ...