// purpose of this project is to communicate with my girlfriend "hey, I fed the dog" on days that I leave for work
// before she wakes up (or vice-versa)

// A red led indicates that the dog has not been fed within the feedMeDelay (8 hours, or whatever)
// A green led indicates that one of us has fed the dog within that time

// A pushbutton is present to reset the timer, when one of us feeds the dog

unsigned long timeSinceFed;
  //feedMeDelay is time from the button being pressed
  //until the green LED turns off and red LED turns on
unsigned long feedMeDelay = 10*1000;
  //green LED, indicating dog has been fed on pin 4
  //red LED, indicating dog has not been fed in more than feedMeDelay on pin 2
  //Pushbutton on pin 7
const int happyDog = 3;
const int hungryDog = 2;
const int fedButton = 4;

int buttonState = 0;


void setup() {
  // dog is initally hungry on poweron, if he's been fed we push button
Serial.begin(9600);
pinMode(happyDog, OUTPUT);
pinMode(hungryDog, OUTPUT);
pinMode(fedButton, INPUT_PULLUP);
digitalWrite(happyDog, LOW);
digitalWrite(hungryDog, HIGH);
}

void loop()
{
  //get the time at the start of this loop()
    unsigned long currentMillis = millis();

  // check the button
   if (digitalRead(fedButton) == LOW)
   {
    // Button was pressed
    // Dog was fed, update timeSinceFed to current millis
  unsigned long timeSinceFed = currentMillis;
    //turn on Green LED



   if ((currentMillis-timeSinceFed)>=feedMeDelay)
    //dog needs to be fed
   {
    digitalWrite(happyDog, LOW);
    digitalWrite(hungryDog, HIGH);
   }
   else
   {
    digitalWrite(happyDog, HIGH);
    digitalWrite(hungryDog, LOW);
   }
}