Automatic Fish Feeder using Raspberry Pi Pico

Introduction

We are going to build an automatic fish feeder which can feed the fish every 24 hours.
It will have a knob to control the food portion.
By default, it will feed the fish every day at 8AM but there will be 2 buttons to set the custom time.
Also, there will be a display, which will show details like set time, portion size, real-time, and temperature.
The device runs on a 9V power supply.

Required Components

1. Raspberry Pi Pico
2. 3D Printed Funnel
3. 9V Motor
4. 5V Relay
5. RTC Clock
   
6. Display Module
7. Potentiometer
8. Push Button
9. LM 7805
10. LM 7809
11. 9V Power Adapter
12. DC power Female Adapter
13. Capacitor
14. Resistor
15. Vero Board
16. Soldering Tools
17. Acrylic Sheet
18. Other random parts and components

Circuit Diagram

Code

from machine import I2C, Pin
from urtc import DS1307
from ssd1306 import SSD1306_I2C
import utime
import machine
import time
counter=-1
motor=Pin(2, Pin.OUT)
led=Pin(25,Pin.OUT)
push_button = Pin(3, Pin.IN)
push_button1 = Pin(5, Pin.IN)
push_button2 = Pin(4, Pin.IN)
analog_value1 = machine.ADC(28)
analog_value2 = machine.ADC(27)
analog_value3 = machine.ADC(26)
led1=Pin(11,Pin.OUT)
led2=Pin(12,Pin.OUT)
led3=Pin(13,Pin.OUT)
led4=Pin(14,Pin.OUT)
led5=Pin(15,Pin.OUT)
sensor_temp = machine.ADC(4)
conversion_factor = 3.3 / (65535)
i2c1 = I2C(1,sda = Pin(6), scl = Pin(7), freq=200000)
oled = SSD1306_I2C(128, 64, i2c1)
i2c0 = I2C(0,sda = Pin(0), scl = Pin(1), freq=400000)
rtc = DS1307(i2c0)
print("Current time:" + str(rtc.datetime()))
def map(x, in_min, in_max, out_min, out_max):
    """ Maps two ranges together """
    return int((x-in_min) * (out_max-out_min) / (in_max - in_min) + out_min)
def action():
    if counter==-1 and hour == 8 and minute == 0 and second == 0: #set time for feeding
        motor.value(1)
        utime.sleep(unit)
   
    elif hour==counter and minute== 0 and second==0:
        motor.value(1)
        utime.sleep(unit)
                
    else:
        motor.value(0)
               
def button():
    if logic_state == 1:     
      motor.value(1)             
    else:                       
      motor.value(0)             
     
def active():
    led.toggle()
    
while True:
    if push_button1.value()==1:
           print("Button Pressed")
           counter+=1
    elif push_button2.value()==1:
            print("Button 2 prssed")
            counter-=1
       
    print("Count={}".format(counter))
    
    reading = sensor_temp.read_u16() * conversion_factor
    temperature = 27 - (reading - 0.706)/0.001721
    #print(temperature)
    
    (year,month,date,day,hour,minute,second,p1)=rtc.datetime()
    
    logic_state = push_button.value()
    reading1 = analog_value1.read_u16()
    unit = map(reading1,0, 65535,1,5)
    
    #print("Unit", unit)
    #print("time_hour",time_hour)
    #print("time_hour",time_minute)
    #print(hour,":",minute,":",second)
    
    oled.fill(0)
    oled.text("Time: ", 0, 0)
    oled.text((str(hour) + ":" + str(minute) + ":" + str(second)), 40, 0)
    oled.text("Feed: ", 0, 15)
    oled.text(str(counter), 40, 15)
    oled.text("Hours", 60,15)
    oled.text("Temp: ",0,30)
    oled.text(str(round(temperature,1)),50,30)
    oled.text("*C",85,30)
    oled.text("Portion:",0,45)
    oled.text(str(unit),70,45)
    oled.show()
    
    action()
    button()
    active()
    utime.sleep(0.2)