// Exercise 04: Toggling an LED using a Push Button on Arduino

// Objective: Connect a push button to an Arduino and create a program that toggles
// the state of a built-in LED each time the button is pressed.
// 
// the challange is to debounce the signal.
//
// raw push button signal when being pushed:
//
//   button pushed │      ┌┐┌┐┌──────────┐┌┐┌┐           ┌┐┌┐┌──────────┐┌┐┌┐       
//                 │      │││││          │││││           │││││          │││││            
// button released │ ─────┘└┘└┘          └┘└┘└───────────┘└┘└┘          └┘└┘└──────
//                 └───────────────────────────────────────────────────────────────────────
//                                                 time           
//                                                                   
// expected result:                                             
//                                                                     
//         LED ON  │       ┌──────────────────────────────┐                           
//                 │       │                              │                                        
//        LED OFF  │  ─────┘                              └─────────────────────────── 
//                 └────────────────────────────────────────────────────────────────────────
//                                                time
//
// Resources:
//    millis: https://www.arduino.cc/reference/en/language/functions/time/millis/



void setup() {
// Initialization:
// Set up the button and LED pins as inputs and outputs respectively.
// Also, initialize any required variables.
}

void loop() {
// Main code:
// Read the state of the button and determine if it has been pressed.
// If the button is pressed, toggle the state of the LED (on to off, or off to on).
}