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I had an idea that could help people who want to build this: why don't you make the value below which the alarm should be triggered a variable that can be changed with a potentiometer? After all both components are resistors, which means they "create" an analogRead between 0-1023...I hope this helped someone and good luck with the project.
Bad idea...Just use if digitalRead(1, HIGH) || digitalRead(2, HIGH) etc.(|| means or).You can thank me later.