/*
  Wash Hands Timer
  Written June 14, 2020
  by R Jordan Keindler
  Uses an I2C 1602, An IR Obstacle Avoidance Module,
  and an Arduino UNO
*/
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2); // Set I2C address to 0x27

int IRModulePinNumber = 7;
int delay1 = 1000;
int i;
int val;
void setup()
{
  pinMode(IRModulePinNumber, INPUT);
  lcd.init(); // initialize the lcd
  Serial.begin(9600);
}
void loop() {
  val = digitalRead(IRModulePinNumber); // Read the IR Collision Avoidance OUT pin
  Serial.print(val);
  Serial.print("\n");
  if (val == 0) // If a hand is near
  {
    lcd.backlight(); // Turn on the backlight
    lcd.clear(); // Clear the LCD and place cursor at first position on first line
    lcd.print("Wash Hands Timer"); // Print "Wash Hands Timer" on first line of LCD
    lcd.setCursor(0, 1); // Position display cursor on second line
    lcd.print("Elapsed time: "); // Print "Elapsed time: " on second line of LCD
    for (i = 1; i <= 60; i++) { // Count the seconds
      lcd.setCursor(14, 1);
      lcd.print(i);
      delay(delay1);
    }
    lcd.noBacklight(); // Turn backlight Off
  }
}