Automatic pet feeder arduino - 3D Printed (with stepper motor)

I made an automatic 3D Printed Pet Feeder (or just dispenser, but I use it to feed my dog). I 3D modelled all that project. U can print it by yourself. All parts are down there.

Basically how it works, is u type in two Feeding Times, for example 8:30 and 17:30, then when time is right stepper motor enables and feeds your little pet.


Electric Components:

   Stepper Motor NEMA17 - 42HB34F08AB

   Stepper Motor Driver A4988

   Arduino UNO

   Arduino Keypad 4x4

   RTC DS3231 Clock

   LCD Display 16x2

   Step Down Module (I used LM2596S DC/DC) 12V to 5V

   12V Power Supply

   a lot of wires



Step 1: Printing All Parts


Printing all the parts took me about 5 days. To assemble everything together I used 3mm bolts (m3) and 3mm nuts.

Attachments

   main pipe.stl Download

   nema 17 mount.stl Download

   pipe extension.stl Download

   screw nema 17 5mm and nut.stl Download

   support 1.stl Download

   support 2.stl Download

   tank crater (floor).stl Download

   tank roof.stl Download

   tank walls.stl Download

   top part main pipe.stl Download

   box roof.stl Download

   box wall.stl Download

   cap.stl Download

   big box.stl Download


 

Step 2: Electronics

Wire everything like in the circuit. If your LCD screen is too dark or too bright try different values of resistors or play with the voltage regulator.




Step 3: Arduino Code

Arduino Code includes additional libraries: DS3231 RTC, Arduino Keypad 4x4

Keypad library

DS3231 library

When you press 'A' - Program asks for first feed time and waits untill you type in HH:MM:SS

When you press 'B' - Program asks for second feed time and waits untill you type in HH:MM:SS

When you press 'C' - Stepper Motor runs for one cycle (one feed)

When you press 'D' - LCD displays current Date

LCD displays normally current Time and hour and minutes of first and second feed time.

#include <DS3231.h>
#include <LiquidCrystal.h>
#include <Keypad.h>


const byte ROWS = 4;
const byte COLS = 4;
const int stepPin = 10;
const int dirPin = A3;

char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = { 2, 3, 4, 5 };
byte colPins[COLS] = { 6, 7, 8, 9 };

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
DS3231 rtc(A4, A5);

LiquidCrystal lcd(A0, A1, A2, 11, 12, 13); // (rs, enable, d4, d5, d6, d7)

int feed_time = 2000;    //define how fast stepper motor works
int feed_length = 600;   //define how much steps should your motor do (mine does 200 for full spin)

String feed1;
String feed2;
char key[8];
int j = 0;
char button;


 void setup() {
  
  rtc.begin();
  lcd.begin(16,2);
  Serial.begin(9600);
  pinMode(A0, OUTPUT);
  pinMode(A1, OUTPUT);
  pinMode(A2, OUTPUT);
  pinMode(stepPin,OUTPUT); 
  pinMode(dirPin,OUTPUT);
}
 
 void loop() {

 lcd.setCursor(0,0);
 lcd.print("Time: ");
 lcd.print(rtc.getTimeStr());
 lcd.setCursor(0,1);
      //lcd.print("Date: ");               //Date to display
      //lcd.print(rtc.getDateStr());
 lcd.print("1)");
 lcd.print(feed1);
 lcd.setCursor(7,1);
 lcd.print(" 2)");
 lcd.print(feed2);
 lcd.setCursor(15,1);
 lcd.print(" ");
  
 button = keypad.getKey();
 
 if(button == 'A'){
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("HH:MM:SS 1st");
  delay(500);
  j = 0;
  lcd.setCursor(j,1);
  key[0] = keypad.waitForKey();
  lcd.print(key[0]);j++;
  lcd.setCursor(j,1);
  key[1] = keypad.waitForKey();
  lcd.print(key[1]);j++;
  lcd.setCursor(j,1);
  key[2] = ':';
  lcd.print(key[2]);j++;
  lcd.setCursor(j,1);
  key[3] = keypad.waitForKey();
  lcd.print(key[3]);j++;
  lcd.setCursor(j,1);
  key[4] = keypad.waitForKey();
  lcd.print(key[4]);j++;
  lcd.setCursor(j,1);
  key[5] = ':';
  lcd.print(key[5]);j++;
  lcd.setCursor(j,1);
  key[6] = keypad.waitForKey();
  lcd.print(key[6]);j++;
  lcd.setCursor(j,1);
  key[7] = keypad.waitForKey();
  lcd.print(key[7]);
  key[8] = '\0';
  feed1 = String(key);
  delay(1000);
  lcd.clear(); 
 }

 if(button == 'B'){
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("HH:MM:SS 2nd");
  delay(500);
  j = 0;
  lcd.setCursor(j,1);
  key[0] = keypad.waitForKey();
  lcd.print(key[0]);j++;
  lcd.setCursor(j,1);
  key[1] = keypad.waitForKey();
  lcd.print(key[1]);j++;
  lcd.setCursor(j,1);
  key[2] = ':';
  lcd.print(key[2]);j++;
  lcd.setCursor(j,1);
  key[3] = keypad.waitForKey();
  lcd.print(key[3]);j++;
  lcd.setCursor(j,1);
  key[4] = keypad.waitForKey();
  lcd.print(key[4]);j++;
  lcd.setCursor(j,1);
  key[5] = ':';
  lcd.print(key[5]);j++;
  lcd.setCursor(j,1);
  key[6] = keypad.waitForKey();
  lcd.print(key[6]);j++;
  lcd.setCursor(j,1);
  key[7] = keypad.waitForKey();
  lcd.print(key[7]);
  key[8] = '\0';
  feed2 = String(key);
  delay(1000);
  lcd.clear(); 
 }
 if(button == 'D'){
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Time: ");
  lcd.print(rtc.getTimeStr());
  lcd.setCursor(0,1);
  lcd.print("Date: ");               //Date to display
  lcd.print(rtc.getDateStr());
  delay(5000);
  lcd.clear();
 }
 if(button == 'C'){
 digitalWrite(dirPin,HIGH);        // Enables the motor to move in a particular direction
  
  for(int x = 0; x < feed_length; x++) {     // Makes 200 pulses for making one full cycle rotation
    digitalWrite(stepPin,HIGH); 
    delayMicroseconds(feed_time); 
    digitalWrite(stepPin,LOW); 
    delayMicroseconds(feed_time); 
  }
  delay(1000);
 } 
 if (feed1==rtc.getTimeStr())
 {  
   digitalWrite(dirPin,HIGH);        // Enables the motor to move in a particular direction
  
  for(int x = 0; x < feed_length; x++) {     // Makes 200 pulses for making one full cycle rotation
    digitalWrite(stepPin,HIGH); 
    delayMicroseconds(feed_time); 
    digitalWrite(stepPin,LOW); 
    delayMicroseconds(feed_time); 
  }
  delay(1000);
 } 
 if (feed2==rtc.getTimeStr())
 { 
  digitalWrite(dirPin,HIGH);        // Enables the motor to move in a particular direction
  
  for(int x = 0; x < feed_length; x++) {     // Makes 200 pulses for making one full cycle rotation
    digitalWrite(stepPin,HIGH); 
    delayMicroseconds(feed_time); 
    digitalWrite(stepPin,LOW); 
    delayMicroseconds(feed_time); 
  }
  delay(1000);
 } 
 }

Attachments

Attachments: dog_feeder_keypad_lcd_stepper_motor.ino


Step 4: Set the Time and Date for DS3231 RTC Module

Set the Time and Date for DS3231 RTC Module

Here is code for setting the Time and Date in your DS3231 (it includes library like in the previous step) - DS3231 library

The DS3231 SDA ---> A4 in Arduino

The DS3231 SCL ---> A5 in Arduino

When you write that code into Arduino, you have to open the serial monitor (115200) and just check if your time and date match.

#include <DS3231.h>

// Init the DS3231 using the hardware interface
DS3231  rtc(A4, A5);

void setup()
{
  // Setup Serial connection
  Serial.begin(115200);
  
  // Initialize the rtc object
  rtc.begin();
  
  // Write your current time and date to this following lines
  rtc.setDOW(MONDAY);     // Set Day-of-Week to Monday
  rtc.setTime(12, 0, 0);     // Set the time to 12:00:00 (24hr format)
  rtc.setDate(01, 01, 2014);   // Set the date to January 1st, 2014
}

void loop()
{
  // Send Day-of-Week
  Serial.print(rtc.getDOWStr());
  Serial.print(" ");
  
  // Send date
  Serial.print(rtc.getDateStr());
  Serial.print(" -- ");

  // Send time
  Serial.println(rtc.getTimeStr());
  
  // Wait one second before repeating :)
  delay (1000);
}<br>

Attachments

Attachments: DS3231_Set_Time.ino


Step 5: Screw Mechanism

You just put a nut in hole and screw it with all your force. It keeps screw and motor shaft together and tight. 3D printing that screw was a little harder than I thought. I'm using Ender 3 and I couldn't print it standing (vertically). Model was just collapsing. The only way, that was working for me, was printing it horizontally with support blocks like on photos.


Step 6. Finish

Install parts all together and enjoy your own product!


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