Fat Cat Food Guardian

1/*
2Fat Cat Feeder Calibration sketch December 2022
3Setup your scale  and start the sketch WITHOUT a weight on the scale
4Wait for "place known weight  on scale" message, ad known weight and enter any letter and hit <ENTER>
5*/
6
7#include  "HX711.h"
8const int LOADCELL_DOUT_PIN = 6;
9const int LOADCELL_SCK_PIN =  5;
10HX711 scale;
11float calibration_factor = 40; // this initial calibration  factor will be adjusted according to your load cell later in sketch
12float units;
13float  OneTime;
14
15void setup(){
16Serial.begin(9600);
17scale.begin(LOADCELL_DOUT_PIN,  LOADCELL_SCK_PIN);
18Serial.println("HX711 calibration sketch");
19Serial.println("Remove  all weight from scale");
20                      
21scale.set_scale();        //The  first time you run this sketch, this should be blank i.e.  "scale.set_scale()"
22                          //then divide set scale number by actual weight, add that  here in later!
23
24scale.tare(); //Reset the scale to 0
25Serial.println("Place  known weight on scale");
26while (!Serial.available()) {};   //Type in any letter  in the serial input and hit <ENTER>
27
28OneTime=scale.get_units(10);
29Serial.print  ("Set Scale value is ");
30Serial.println(OneTime);          //take this value  and divide it by actual weight and enter it into
31                                  //line  21 i.e. "scale.set_scale(260.323)"
32                                  //when  you run the sketch again, it should display the proper weight in grams!
33}
34
35void  loop(){
36
37}

1/*
2FatCatFeeder Version 3.0 December 2022
3You will want to run the  calibration sketch and get the calibration factor
4for your load cell prior to  running this sketch.
5I have left some of the serial print statements that I used  to develop this sketch.
6They have been commented out.
7*/
8
9#include <HX711.h>
10#include  <VarSpeedServo.h>
11
12VarSpeedServo myServo;
13
14const int LOADCELL_DOUT_PIN  = 6;  //DOUT to poin 6 of arduino
15const int LOADCELL_SCK_PIN = 5;   //SCK to  pin 5 of arduino
16HX711 scale;
17float calibration_factor = 40; // this initial  calibration factor must be adjusted according to your load cell later in sketch
18
19float  units;                    //weight read from load cell in grams
20
21float little_cat_weight=5000;   // George weights 11 lbs or ~ 5 kg
22float big_cat_weight=6350;      // Lily's  ideal weight is 14 lbs or ~ 6.35 kg
23
24const int servoPin=9;          //Servo  control wire to pin 9 of arduino
25const int bowlOpen=15;         //value that  opens servo to allow feeding/filling
26const int bowlClosed=75;       //value that  covers the bowl to keep George out
27
28const int buttonPin=12;
29int buttonRead;
30int  fillingBowl;
31
32void setup(){
33//Serial.begin(9600);
34scale.begin(LOADCELL_DOUT_PIN,  LOADCELL_SCK_PIN);
35
36myServo.attach(servoPin);
37myServo.write(bowlClosed,  20);      
38
39pinMode(buttonRead,INPUT);
40pinMode(servoPin,OUTPUT);
41
42scale.set_scale(260.32);  //Adjust to this calibration factor here by running calibration sketch first
43scale.tare();            //Reset the scale to 0
44}
45
46void loop(){
47
48buttonRead=digitalRead(buttonPin);   //Read manual opening button for filling the food bowl
49if (buttonRead==0)  {
50  fillingBowl=1;
51  //Serial.println("Filling Food Bowl");
52  delay(50);
53  while(fillingBowl==1){
54    myServo.write(bowlOpen, 20);
55    myServo.wait();
56    buttonRead=digitalRead(buttonPin);
57    if (buttonRead==0){
58      fillingBowl=0;
59      //Serial.println("Filling Completed");
60      delay(50);
61    }
62  }
63  
64}
65
66myServo.detach();             // scale.get_units call causes  servo to jitter due to interrupts, need to disable servo temporarily
67units =  scale.get_units(), 5; // read the weight value from load cell
68myServo.attach(servoPin);     // re-enable servo to allow movement
69//Serial.println(units);      // display  weight of cat currently on feeder
70
71if (units < 10) {
72  //Serial.println("No  cat");
73  myServo.write(bowlClosed, 20);
74  myServo.wait();
75}
76if (units  > 10 && units < big_cat_weight) {
77  //Serial.println("Little Cat");
78  myServo.write(bowlClosed,  20);
79  myServo.wait(); 
80}
81if (units > big_cat_weight){
82  //Serial.println("Big  Cat");
83  myServo.write (bowlOpen, 20);   // Open feeder slowly
84  myServo.wait();
85  delay (7000);                   //Keep bowl open for 7 seconds after load is gone
86
87}
88
89}