EDIT* I need to write a program that uses the Arduino uno as a countdown timer that allows the user to set the desired time and start the timing countdown. Signal the end of the timing period with an LED, and generate a beep tone. If the unit is not reset in 10 seconds after the beep, the beeping should get faster and be at a higher frequency.
Welcome. You must have skipped over the forum introduction. It explains how to provide information in a way that makes your question easy to answer. The basic problem with your post, you didn't say enough about your project.
Ive updated my question. Does that better explain my question?
Ive read "Serial input basics" but I'm still confused.
What are you confused about?
What have you tried? What were the results? What Arduino? Do you have a schematic to share?
Post your best try. Please read the forum guidelines to see how to properly post code and some information on making a good post.
Use the IDE autoformat tool (ctrl-t or Tools, Auto format) before posting code in code tags.
I wasn't using Serial.parseInt();
That reply does not answer the questions that you were asked. You still haven't provided the basic information that is needed in order to help. Your edit to the original post only added some clarification to your broad problem description. By the way, when you make updates, please add them in a new message instead of editing previous posts. It makes the replies seem like nonsense when you do.
Similar advice you can glean from the forum introduction. Please read it.
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