// Using LCD1602 to Arduino Uno connection example and sprintf
// function to clean up code, and test the function's usability
// potential in some of my other projects.


#include <LiquidCrystal.h>

int button = 3;
bool pressed = false;
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
char time[7];
int minutes = 0;
int seconds = 0;

void reset()
{
  pressed = false;
  minutes = 0;
  seconds = 0;
}

void setup()
{
  lcd.begin(16, 2);
  // you can now interact with the LCD, e.g.:
  //lcd.print("Hello World!");
  pinMode(button, INPUT_PULLUP);
  //sprintf(time, "%02dm%02ds", minutes, seconds); // requires multiple calls in order to display properly
}

void loop()
{
    lcd.clear();
    lcd.print("   Waiting...");
    while (!pressed)
    {
    delay(1000);
    seconds++;
    if (seconds == 60)
    {
      seconds = 0;
      minutes++;
    }
    if (digitalRead(button) == LOW)
    {
      delay(100);
      if (digitalRead(button) == HIGH) {pressed = true;}
    }
    sprintf(time, "%02dm%02ds", minutes, seconds);
    lcd.setCursor(0, 1);
    lcd.print(" Press  button");
   }
  lcd.clear();
  lcd.print("Button pressed:");
  lcd.setCursor(0, 1);
  lcd.print(time);
  lcd.print(" ago");
  delay(1500);
  reset();
}