NOTE

I would like to start by saying you will need to know how to code and understand a Arduino

Some part's might be buggy i tried my best to get all parts to be a plug and play i believe i have accomplished that. The track is loose at this time i'm not sure on a track tincture but it works fine just a little chunky looking.

in the code i have provided will feed your tank ever 4 day's you can change that as you wish in the code. This design use's flake food not pellet's wen you go to add your food to the hopper crumble your fish food to insure the hoper wont clog.

THING'S NEEDED 

3M screws 

Arduino uno 

Standard size servo

Paper clips (for track pins)

Glue (for gear on motor)

Step motor - 28BYJ-48

Motor driver - ULN2003 Motor driver

Bread board 

5V power supply

  Code blow

include <Servo.h>

#include <Stepper.h>

#define STEPS_PER_REV 2048

Stepper conveyorMotor(STEPS_PER_REV, 8 ,10 ,9 ,11);

Servo feedServo;

int servoPin = 6;

int angleClosed = 120;

int angleOpen = 105;

unsigned long lastFeedTime = 0;

unsigned long feedInterval = 345600000;    /// time set to 4 day's

void setup() {

feedServo.attach(servoPin);

feedServo.write(angleClosed);

conveyorMotor.setSpeed(10);

lastFeedTime = millis() - feedInterval;

}

void loop() {

  if (millis() - lastFeedTime >= feedInterval) {

    feedServo.write(angleOpen);

    delay(1000);

    feedServo.write(angleClosed);

    delay(500);

    conveyorMotor.step(-850);

    shakeBelt();

  lastFeedTime = millis();

  }

  }

void shakeBelt (){

  for (int i = 0; i < 10; i++)

{

   conveyorMotor.step(100);

   delay(3);

   conveyorMotor.step(-100);

   delay(3);

   }

}