Why does the LED turn on after the while loop becomes false?

[PerryBebbington]

@adrianoles
I think you will find the following tutorials helpful:

My take on reading and responding to buttons:

Buttons and other electro-mechanical inputs (introduction)

Intended audience This tutorial is intended for people who have mastered the basics of electronics and C/C++ programming. If you are a beginner and find the concepts difficult, please review the basic examples in the Arduino IDE. In this tutorial BUTTON will be a generic term for any kind of switch or other input device with mechanical contacts. Introduction A common requirement in many projects is to have push buttons, switches or other electro-mechanical devices connected as inputs to an A…

Using millis() for timing. A beginners guide

Part 1 It is not usually long before new Arduino users discover that although the delay() function is easy to use it has side effects, the main one of which is that its stops all activity on the Arduino until the delay is finished (not quite true, I know, but that is usually how the problem presents itself). When this occurs the new user is usually directed to the BlinkWithoutDelay example sketch (BWoD) and/or the excellent thread entitled Several things at the same time. Several things at the…

There is also blink without delay in the Arduino IDE.

I hope those help you.