Pavlov’s Feeder. Un dispensador automático de comida para mascotas con Arduino

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#include <Arduino.h>
#include <LiquidCrystal.h> /* Library for the LCD */

#include <Wire.h>
#include "RTClib.h"

#include <Servo.h>

/* Initialize the library with interface pins numbers: */
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
int val;

/* Speaker (buzzer): */
int speakerPin = 13;

/* Real time clock: */
RTC_DS3231 rtc;

/* Servo: */
Servo myservo;
int pos = 0; /* Variable to store the servo position */
int servoPin = 10;

DateTime now;
byte hour, minute;
String h, m;

int feedHour = 14;
int feedMin = 0;
boolean foodTime = true;

void setup() {

  /* Set speaker pin as an output pin: */
  pinMode(speakerPin, OUTPUT);
  /* Set up LCD's number of columns and rows: */
  lcd.begin(16, 2);
  /* Start RTC: */
  rtc.begin();
  
}

void loop() {

  now = rtc.now();
  printTime(now);

  /* LCD buttons are all connected to A0 pin with this values:
   * 0-50: UP
   * 50-150: RIGHT
   * 150-300: DOWN
   * 300-500: LEFT
   * 500-750: SELECT
   */
  val = analogRead(A0);
  if ((val >= 500) && (val <= 750)) { // SELECT
    setFeedHour();
    delay(1000);
  }
  
  now = rtc.now();
  printTime(now);
  
  delay(2000);

  if ((feedHour == now.hour()) && (feedMin == now.minute()) 
      && foodTime) {
    feed();
  }

  /* We use 'foodTime' so food doesn't get served twice 
   * if the feed routine ends in less than a minute. */
  if (feedMin != now.minute()) {
    foodTime = true;
  }
  
}

void feed() {

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Sirviendo comida");
  
  /* Food gets served: */  
  /* Attach servo on pin 10 (We attach servo only when
   * we need it and detach it afterwards to stop it 
   * from shaking) */
  myservo.attach(servoPin); 
  /* Servo moves to open lid for food to fall through.
   * 'pos' goes from 0 to 180 degrees in steps of 1 degree
   * and then gets written to servo*/
  for (pos = 0; pos <= 120; pos += 1) {
    myservo.write(pos);
    /* Wait 15ms for the servo to reach the position */
    delay(15); 
  }
  delay(1000);
  /* Go back from 180 to 0 degrees to close the lid: */
  for (pos = 120; pos >= 0; pos -= 1) {
    myservo.write(pos);
    delay(15);
  }
  delay(3000);
  /* Detach servo: */
  myservo.detach();

  bell();
  
  foodTime = false;

}

void bell() {

  for (int i=0; i<6; i++) {

    /* Bell sound: */
    tone(speakerPin, 1915);
    delay(700);
    tone(speakerPin, 1700);
    delay(700);
    tone(speakerPin, 1519);
    delay(700);
    noTone(speakerPin);
  
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Hora de la");
    lcd.setCursor(0, 1);
    lcd.print("comida!!!!");
  
    delay(5000);

    now = rtc.now();
    printTime(now);

    delay(5000);

  }
  
}

/* Prints actual time and feed time.
 * If hour or minute is just one digit, a zero
 * will be added for formatting purposes */
void printTime(DateTime t) {

  /* Actual time */
  lcd.setCursor(0, 0);
  lcd.print("H. actual: ");
  hour = t.hour();
  if (hour < 10) { 
    h = "0" + String(hour); 
  } else { 
    h = String(hour); 
  }
  lcd.print(h);
  lcd.print(':');
  minute = t.minute();
  if (minute < 10) { 
    m = "0" + String(minute); 
  } else { 
    m = String(minute);
  }
  lcd.print(m);

  /* Feed hour */
  lcd.setCursor(0, 1);
  lcd.print("H. comida: ");
  if (feedHour < 10) {
    h = "0" + String(feedHour);
  } else {
    h = String(feedHour); 
  }
  lcd.print(h);
  lcd.print(':');
  if (feedMin < 10) { 
    m = "0" + String(feedMin); 
  } else { 
    m = String(feedMin); 
  }
  lcd.print(m);

  return;

}

void setFeedHour() {
  
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Cambiar hora de");
  lcd.setCursor(0, 1);
  lcd.print("comida: ");
  
  int hourAux = feedHour;

  while(true) {
  
    lcd.setCursor(8, 1);
    if (hourAux < 10) { 
      lcd.print("0");
      lcd.print(hourAux);
    } else { 
      lcd.print(hourAux); 
    }
    lcd.setCursor(10, 1);
    lcd.print(':');
    lcd.setCursor(11, 1);
    if (feedMin < 10) {
      m = "0" + String(feedMin); 
    } else { 
      m = String(feedMin); 
    }
    lcd.print(m);

    delay(200);

    /* We check which button is being pressed */
    val=analogRead(A0);      
    if ((val>=50) && (val<=150)) { /* UP + 1 hour */
      hourAux = (hourAux + 1) % 24; 
    } else if ((val>=150) && (val<=300)) { /* DOWN - 1 hour */
      hourAux = hourAux - 1; 
      if (hourAux < 0) {
        hourAux = 23;
      }
    }
    else if ((val>=300)&&(val<=500)) { /* LEFT cancel */
      break;
    }
    if ((val>=0)&&(val<=50)) { /* RIGHT save */
      feedHour = hourAux;
      setFeedMin();
      break;
    }
    
  }
  
  return;
  
}

void setFeedMin() {

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Cambiar min. de");
  lcd.setCursor(0, 1);
  lcd.print("comida: ");
  
  int minAux = feedMin;
  
  while(true) {

    lcd.setCursor(8, 1);
    if (feedHour < 10) { 
      h = "0" + String(feedHour); 
    } else { 
      h = String(feedHour);
    }
    lcd.print(h);
    lcd.setCursor(10, 1);
    lcd.print(':');
    lcd.setCursor(11, 1);
    if (minAux < 10) {
      m = "0" + String(minAux); 
    } else {
      m = String(minAux); 
    }
    lcd.print(m);
    
    delay(200);

    /* We check which button is being pressed */
    val = analogRead(A0);
    if((val>=50) && (val<=150)) { /* UP + 1 min */
      minAux = (minAux + 1) % 60; 
    } else if((val>=150) && (val<=300)) { /* DOWN - 1 min */
      minAux = minAux - 1; 
      if (minAux < 0) {
        minAux = 59;
      }
    } else if((val>=300) && (val<=500)) { /* LEFT cancel */
      break;
    } else if((val>=500) &&( val<=750)) { /* SELECT save */
      feedMin = minAux;
      break;
    }
        
  }
  
  return;
  
}

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#include <Wire.h>
#include "RTClib.h"

RTC_DS3231 rtc;

void setup() {

  rtc.begin();
  rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));

  /* The rest of the code is not necessary to set the time,
   * we're just making sure it was set correctly: */
  Serial.begin(9600);
  
  DateTime now = rtc.now();
  printDate(now);
  
}

void loop() {

}

void printDate(DateTime date) {
  
   Serial.print(date.year(), DEC);
   Serial.print('/');
   Serial.print(date.month(), DEC);
   Serial.print('/');
   Serial.print(date.day(), DEC);
   Serial.print(" ");
   Serial.print(date.hour(), DEC);
   Serial.print(':');
   Serial.print(date.minute(), DEC);
   Serial.print(':');
   Serial.print(date.second(), DEC);
   Serial.println();
   
}