Pet Feeder using Arduino Uno

Today we ll be learning how to make an Automatic Pet Feeder using Arduino UNO board.

We'll also be using a RTC board coupled with our UNO board to keep a date and time track.

Materials Required

• Arduino Uno
• 4*4 or 3*4
  
  
  Matrix Keypad
• 16*2 LCD
• Push Button
• Resistors
• Connecting Wires
• Servo Motor(non metal works)
• Breadboard
• DS3231 RTC Module

DS3231 RTC Module, where RTC stands for Real Time Clock is used to keep a track of Date and Time. It is powered by its own supply just like CMOS battery in our desktop or laptop motherboards.

You can order one from here.

When using this module for the first time you have to set the date and time.

You can find the library for RTC module here.

So first we'll make our connections this way :

Code :

#include <DS3231.h>

#include <Servo.h>

#include <LiquidCrystal.h>

#include <Keypad.h>

const byte ROWS = 4; // Four rows

const byte COLS = 4; // Three columns

// Define the Keymap

char keys[ROWS][COLS] = {

  {'1','2','3','A'},

  {'4','5','6','B'},

  {'7','8','9','C'},

  {'*','0','#','D'}

};

// Connecting the keypad (Rows)

byte rowPins[ROWS] = { 2, 3, 4, 5 };

// Connecting the keypad ( Columns)

byte colPins[COLS] = { 6, 7, 8, 9 };

//  Create the Keypad

  Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

DS3231  rtc(A4, A5);

Servo servo_test;      //initialize a servo object for the connected servo  

LiquidCrystal lcd(A0, A1, A2, 11, 12, 13); // Creates an LC object. Parameters: (rs, enable, d4, d5, d6, d7)

 int t1, t2, t3, t4, t5, t6;

 

boolean feed = true; // condition for alarm

 char key;

 int r[6];

 

 void setup() 

 { 

  servo_test.attach(10);   // attach the signal pin of servo to pin9 of arduino

  rtc.begin();

  lcd.begin(16,2);

  servo_test.write(55); 

  Serial.begin(9600);

  pinMode(A0, OUTPUT);

  pinMode(A1, OUTPUT);

  pinMode(A2, OUTPUT);

  

 } 

 

 void loop() 

 { 

lcd.setCursor(0,0);

int buttonPress;

buttonPress = digitalRead(A3);

if (buttonPress==1)

 setFeedingTime();

 

//Serial.println(buttonPress);

 lcd.print("Time:  ");

 String t = "";

 t = rtc.getTimeStr(); 

 t1 = t.charAt(0)-48;

 t2 = t.charAt(1)-48;

 t3 = t.charAt(3)-48;

 t4 = t.charAt(4)-48;

 t5 = t.charAt(6)-48;

 t6 = t.charAt(7)-48;

 

 lcd.print(rtc.getTimeStr());

 lcd.setCursor(0,1);

 lcd.print("Date: ");

 lcd.print(rtc.getDateStr());

 

 if (t1==r[0] && t2==r[1] && t3==r[2] && t4==r[3]&& t5<1 && t6<3 && feed==true)

 { 

  servo_test.write(100);                   //command to rotate the servo to the specified angle 

   delay(400);   

  servo_test.write(55); 

  feed=false;

 } 

 }       

void setFeedingTime()

{

  feed = true;

   int i=0;

  lcd.clear();

  lcd.setCursor(0,0);

  lcd.print("Set feeding Time");

  lcd.clear();

  lcd.print("HH:MM");

  lcd.setCursor(0,1);

  

  while(1){

    key = kpd.getKey();

    char j;

    

  if(key!=NO_KEY){

    

    lcd.setCursor(j,1);

    

    lcd.print(key);

    

    r[i] = key-48;

    i++;

    j++;

    if (j==2)

    {

      lcd.print(":"); j++;

    }

    delay(500);

  }

  if (key == 'D')

  {key=0; break; }

  }

}