High Precision Scale with Arduino

This is a very precise scale for any weight up to 1.5 kg!

Jul 10, 2018

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22 respects

Components and supplies

Arduino Nano R3

Standard LCD - 16x2 White on Blue

HX 711 scale module

Tools and machines

Saw

3D Printer (generic)

Apps and platforms

Arduino IDE

Project description

Code

The code

c_cpp

This code might be not the best written one, but please remember that this was one of my very first projects!

1#include <LiquidCrystal_I2C.h>
2#include <HX711.h>
3
4HX711 scale(A1,   A0); 
5LiquidCrystal_I2C lcd(0x3F,16,2);
6
7
8// 
9volatile float newWeight;
10volatile   float prevWeight;
11volatile float money;
12volatile float item;
13volatile float   change;
14volatile float flag;
15volatile int show = 1;
16volatile float itemWeight;
17volatile   int amount;
18
19int tara = 4;
20unsigned long int lastTime;
21
22int up =   2;
23int down = 3;
24volatile int pos = 1;
25
26
27void setup() {
28  lcd.init();                                          //   
29  lcd.backlight();                                    //   
30  scale.set_scale(-1537.34);                          //    (   )
31  scale.tare();                                        //  
32  prevWeight = 0;                                     //     
33  scale.power_up();
34
35  Serial.begin(9600);
36  
37  pinMode(tara,   INPUT);
38  pinMode(up, INPUT);
39  attachInterrupt(0, dec, RISING);
40  pinMode(down,   INPUT);
41  attachInterrupt(1, inc, RISING);
42
43}
44
45void myClear() {
46     lcd.setCursor(0,0);
47    lcd.print("                ");
48    lcd.setCursor(0,1);
49     lcd.print("                ");
50    lcd.setCursor(0,0);
51  }
52
53void   reload() {
54  prevWeight = 0;
55  newWeight = 0;
56  money = 0;
57  item =   0;
58  change = 0;
59  show = 1;
60}
61
62void dec() {
63  reload();
64  if   (pos > 1) {
65    pos -= 1; 
66  }
67  else {
68    pos = 4;  
69  }
70}
71
72void   inc() {
73  reload();
74  if (pos < 4) {
75    pos += 1;  
76  }
77  else {
78     pos = 1;  
79  }    
80}
81
82void analysis() {
83  if (change > 1.00 &&   change < 2.40) {               // 1c           
84    money += 1;
85    flag =   1.25;
86  }
87  else if (change > 2.80 && change < 3.15) {          // 2c
88     money += 2;
89    flag = 2.50;
90  }
91  else if (change > 3.70 && change   < 3.99) {          // 5c
92    money += 5;
93    flag = 3.80;
94  }
95  else   if (change > 4.00 && change < 4.15) {          // 10c
96    money += 10;
97    flag   = 4;
98  }
99  else if (change > 5.50 && change < 6.80) {          // 20c
100     money += 20;
101    flag = 6;
102  }
103  else if (change > 7.60 && change <   7.95) {          // 50c
104    money += 50;
105    flag = 7.80;
106  }
107  else   if (change > 7.30 && change < 7.50) {          // 1E
108    money += 100;
109    flag   = 7.40;
110  }
111  else if (change > 8.20 && change < 9.00) {          // 2E
112     money += 200;
113    flag = 8.50;
114  }
115}
116
117//  :
118void standard()   {
119  lcd.setCursor(0,0);
120  lcd.print(" Standard mode! "); 
121  lcd.setCursor(0,1);                                  //    1  2 !
122  lcd.print("Weight: ");
123   if (prevWeight != round(scale.get_units(10)) ) {     //   ,
124    newWeight =   scale.get_units(10);                   //     
125  }
126  lcd.setCursor(9,1);
127   if (newWeight < 0) { scale.tare(); }
128  else { lcd.print(newWeight); }
129  prevWeight   = newWeight;                             //    
130
131}
132///////////////////////////////////
133
134void   multiMoney() {
135  lcd.setCursor(0,0);
136  lcd.print("  Money multi!  ");
137   lcd.setCursor(0,1);
138  lcd.print("Euro: ");
139  if (prevWeight != round(scale.get_units(10))   ) {    
140    newWeight = scale.get_units(10);
141    change = newWeight - prevWeight;
142     analysis();
143    lcd.setCursor(6,1);
144    lcd.print(money / 100.00);
145     prevWeight = newWeight;          
146  }
147}
148//////////////////////////////////////////
149
150void   massMoney() {
151  if (prevWeight != round(scale.get_units(20)) ) {    
152    newWeight   = scale.get_units(20); 
153    change = newWeight - prevWeight;
154    prevWeight   = newWeight;
155    if (change > 1) {
156      lcd.setCursor(0,1);
157      lcd.print("C:");
158       lcd.setCursor(2,1);
159      lcd.print(show);
160      lcd.setCursor(7,1);
161       lcd.print("A:");
162      lcd.setCursor(10,1);
163      lcd.print(show *   money / 100);
164      show = show + round(change / flag);  
165    }
166  }
167}
168//////////////////////////////////////
169
170void   itemsMass() {
171  if (prevWeight != round(scale.get_units(10)) ) {    
172    newWeight   = scale.get_units(10);
173    change = newWeight - prevWeight;
174    amount = round(change   / itemWeight);
175    lcd.setCursor(0,1);
176    lcd.print("Items: ");
177    lcd.print(amount);
178     lcd.setCursor(9,1);
179    lcd.print("W:");
180    lcd.print(newWeight);
181   }
182}
183//////////////////////////////////////////
184
185
186void loop() {
187   if (millis() - lastTime > 100) {
188    if (digitalRead(tara) == 1) {
189      reload();
190       scale.tare();
191    }
192    lastTime = millis();
193  }
194  
195  if (pos   == 1) {
196    myClear();
197    lcd.setCursor(4,0); 
198    lcd.print("Standard");
199     delay(1000);
200    myClear();
201    while (pos == 1) {
202      standard();
203     } 
204  }
205
206  else if (pos == 2) {
207    myClear();
208    lcd.setCursor(3,0);
209     lcd.print("Money multi");
210    delay(1000);
211    myClear();
212    while   (pos == 2) {
213      multiMoney();  
214    }
215  }
216
217  else if (pos == 3)   {
218    myClear();
219    lcd.setCursor(3,0);
220    lcd.print("Money mass");
221     delay(1000);
222    myClear();
223    lcd.print("Place ONE coin!"); 
224    while   (money == 0) {
225      if (prevWeight != round(scale.get_units(10)) ) {    
226         newWeight = scale.get_units(10);
227        change = newWeight - prevWeight;
228         analysis();
229        lcd.setCursor(0,1);
230        lcd.print(money /   100);
231        prevWeight = newWeight;          
232      }
233    }
234    myClear();
235     lcd.print("Counting ");
236    if (money < 100) {
237      lcd.setCursor(10,0);
238       lcd.print(money);
239      lcd.print("c");
240    }
241    else {
242      lcd.setCursor(10,0);
243       if (money == 100) { lcd.print("1 Euro"); }
244      else { lcd.print("2   Euro"); }
245    }
246    prevWeight = 0;
247    newWeight = 0;
248    change =   0;
249    while (pos == 3) {
250      massMoney();
251    }
252  }
253  
254
255   else if (pos == 4) {
256    myClear();
257    lcd.setCursor(3,0);
258    lcd.print("Items   mass");
259    delay(1000);
260    myClear();
261    myClear();
262    lcd.print("Place   ONE item!");
263    while (newWeight < 1) {
264      if (prevWeight != round(scale.get_units(10))   ) {    
265        newWeight = scale.get_units(10);
266        itemWeight = newWeight   - prevWeight;
267      }
268    }
269    itemWeight = newWeight - prevWeight;
270     lcd.setCursor(0,0);
271    lcd.print("Item weight:");
272    lcd.print(itemWeight);
273     while (pos == 4) {
274      itemsMass();
275    }
276  }
277}
278

#include <LiquidCrystal_I2C.h>
#include <HX711.h>

HX711 scale(A1,   A0); 
LiquidCrystal_I2C lcd(0x3F,16,2);


// 
volatile float newWeight;
volatile   float prevWeight;
volatile float money;
volatile float item;
volatile float   change;
volatile float flag;
volatile int show = 1;
volatile float itemWeight;
volatile   int amount;

int tara = 4;
unsigned long int lastTime;

int up =   2;
int down = 3;
volatile int pos = 1;


void setup() {
  lcd.init();                                          //   
  lcd.backlight();                                    //   
  scale.set_scale(-1537.34);                          //    (   )
  scale.tare();                                        //  
  prevWeight = 0;                                     //     
  scale.power_up();

  Serial.begin(9600);
  
  pinMode(tara,   INPUT);
  pinMode(up, INPUT);
  attachInterrupt(0, dec, RISING);
  pinMode(down,   INPUT);
  attachInterrupt(1, inc, RISING);

}

void myClear() {
     lcd.setCursor(0,0);
    lcd.print("                ");
    lcd.setCursor(0,1);
     lcd.print("                ");
    lcd.setCursor(0,0);
  }

void   reload() {
  prevWeight = 0;
  newWeight = 0;
  money = 0;
  item =   0;
  change = 0;
  show = 1;
}

void dec() {
  reload();
  if   (pos > 1) {
    pos -= 1; 
  }
  else {
    pos = 4;  
  }
}

void   inc() {
  reload();
  if (pos < 4) {
    pos += 1;  
  }
  else {
     pos = 1;  
  }    
}

void analysis() {
  if (change > 1.00 &&   change < 2.40) {               // 1c           
    money += 1;
    flag =   1.25;
  }
  else if (change > 2.80 && change < 3.15) {          // 2c
     money += 2;
    flag = 2.50;
  }
  else if (change > 3.70 && change   < 3.99) {          // 5c
    money += 5;
    flag = 3.80;
  }
  else   if (change > 4.00 && change < 4.15) {          // 10c
    money += 10;
    flag   = 4;
  }
  else if (change > 5.50 && change < 6.80) {          // 20c
     money += 20;
    flag = 6;
  }
  else if (change > 7.60 && change <   7.95) {          // 50c
    money += 50;
    flag = 7.80;
  }
  else   if (change > 7.30 && change < 7.50) {          // 1E
    money += 100;
    flag   = 7.40;
  }
  else if (change > 8.20 && change < 9.00) {          // 2E
     money += 200;
    flag = 8.50;
  }
}

//  :
void standard()   {
  lcd.setCursor(0,0);
  lcd.print(" Standard mode! "); 
  lcd.setCursor(0,1);                                  //    1  2 !
  lcd.print("Weight: ");
   if (prevWeight != round(scale.get_units(10)) ) {     //   ,
    newWeight =   scale.get_units(10);                   //     
  }
  lcd.setCursor(9,1);
   if (newWeight < 0) { scale.tare(); }
  else { lcd.print(newWeight); }
  prevWeight   = newWeight;                             //    

}
///////////////////////////////////

void   multiMoney() {
  lcd.setCursor(0,0);
  lcd.print("  Money multi!  ");
   lcd.setCursor(0,1);
  lcd.print("Euro: ");
  if (prevWeight != round(scale.get_units(10))   ) {    
    newWeight = scale.get_units(10);
    change = newWeight - prevWeight;
     analysis();
    lcd.setCursor(6,1);
    lcd.print(money / 100.00);
     prevWeight = newWeight;          
  }
}
//////////////////////////////////////////

void   massMoney() {
  if (prevWeight != round(scale.get_units(20)) ) {    
    newWeight   = scale.get_units(20); 
    change = newWeight - prevWeight;
    prevWeight   = newWeight;
    if (change > 1) {
      lcd.setCursor(0,1);
      lcd.print("C:");
       lcd.setCursor(2,1);
      lcd.print(show);
      lcd.setCursor(7,1);
       lcd.print("A:");
      lcd.setCursor(10,1);
      lcd.print(show *   money / 100);
      show = show + round(change / flag);  
    }
  }
}
//////////////////////////////////////

void   itemsMass() {
  if (prevWeight != round(scale.get_units(10)) ) {    
    newWeight   = scale.get_units(10);
    change = newWeight - prevWeight;
    amount = round(change   / itemWeight);
    lcd.setCursor(0,1);
    lcd.print("Items: ");
    lcd.print(amount);
     lcd.setCursor(9,1);
    lcd.print("W:");
    lcd.print(newWeight);
   }
}
//////////////////////////////////////////


void loop() {
   if (millis() - lastTime > 100) {
    if (digitalRead(tara) == 1) {
      reload();
       scale.tare();
    }
    lastTime = millis();
  }
  
  if (pos   == 1) {
    myClear();
    lcd.setCursor(4,0); 
    lcd.print("Standard");
     delay(1000);
    myClear();
    while (pos == 1) {
      standard();
     } 
  }

  else if (pos == 2) {
    myClear();
    lcd.setCursor(3,0);
     lcd.print("Money multi");
    delay(1000);
    myClear();
    while   (pos == 2) {
      multiMoney();  
    }
  }

  else if (pos == 3)   {
    myClear();
    lcd.setCursor(3,0);
    lcd.print("Money mass");
     delay(1000);
    myClear();
    lcd.print("Place ONE coin!"); 
    while   (money == 0) {
      if (prevWeight != round(scale.get_units(10)) ) {    
         newWeight = scale.get_units(10);
        change = newWeight - prevWeight;
         analysis();
        lcd.setCursor(0,1);
        lcd.print(money /   100);
        prevWeight = newWeight;          
      }
    }
    myClear();
     lcd.print("Counting ");
    if (money < 100) {
      lcd.setCursor(10,0);
       lcd.print(money);
      lcd.print("c");
    }
    else {
      lcd.setCursor(10,0);
       if (money == 100) { lcd.print("1 Euro"); }
      else { lcd.print("2   Euro"); }
    }
    prevWeight = 0;
    newWeight = 0;
    change =   0;
    while (pos == 3) {
      massMoney();
    }
  }
  

   else if (pos == 4) {
    myClear();
    lcd.setCursor(3,0);
    lcd.print("Items   mass");
    delay(1000);
    myClear();
    myClear();
    lcd.print("Place   ONE item!");
    while (newWeight < 1) {
      if (prevWeight != round(scale.get_units(10))   ) {    
        newWeight = scale.get_units(10);
        itemWeight = newWeight   - prevWeight;
      }
    }
    itemWeight = newWeight - prevWeight;
     lcd.setCursor(0,0);
    lcd.print("Item weight:");
    lcd.print(itemWeight);
     while (pos == 4) {
      itemsMass();
    }
  }
}

The code

c_cpp

This code might be not the best written one, but please remember that this was one of my very first projects!

1#include <LiquidCrystal_I2C.h>
2#include <HX711.h>
3
4HX711 scale(A1,  A0); 
5LiquidCrystal_I2C lcd(0x3F,16,2);
6
7
8// 
9volatile float newWeight;
10volatile  float prevWeight;
11volatile float money;
12volatile float item;
13volatile float  change;
14volatile float flag;
15volatile int show = 1;
16volatile float itemWeight;
17volatile  int amount;
18
19int tara = 4;
20unsigned long int lastTime;
21
22int up =  2;
23int down = 3;
24volatile int pos = 1;
25
26
27void setup() {
28  lcd.init();                                         //   
29  lcd.backlight();                                    //  
30  scale.set_scale(-1537.34);                          //    (   )
31  scale.tare();                                       //  
32  prevWeight = 0;                                     //    
33  scale.power_up();
34
35  Serial.begin(9600);
36  
37  pinMode(tara,  INPUT);
38  pinMode(up, INPUT);
39  attachInterrupt(0, dec, RISING);
40  pinMode(down,  INPUT);
41  attachInterrupt(1, inc, RISING);
42
43}
44
45void myClear() {
46    lcd.setCursor(0,0);
47    lcd.print("                ");
48    lcd.setCursor(0,1);
49    lcd.print("                ");
50    lcd.setCursor(0,0);
51  }
52
53void  reload() {
54  prevWeight = 0;
55  newWeight = 0;
56  money = 0;
57  item =  0;
58  change = 0;
59  show = 1;
60}
61
62void dec() {
63  reload();
64  if  (pos > 1) {
65    pos -= 1; 
66  }
67  else {
68    pos = 4;  
69  }
70}
71
72void  inc() {
73  reload();
74  if (pos < 4) {
75    pos += 1;  
76  }
77  else {
78    pos = 1;  
79  }    
80}
81
82void analysis() {
83  if (change > 1.00 &&  change < 2.40) {               // 1c           
84    money += 1;
85    flag =  1.25;
86  }
87  else if (change > 2.80 && change < 3.15) {          // 2c
88    money += 2;
89    flag = 2.50;
90  }
91  else if (change > 3.70 && change  < 3.99) {          // 5c
92    money += 5;
93    flag = 3.80;
94  }
95  else  if (change > 4.00 && change < 4.15) {          // 10c
96    money += 10;
97    flag  = 4;
98  }
99  else if (change > 5.50 && change < 6.80) {          // 20c
100    money += 20;
101    flag = 6;
102  }
103  else if (change > 7.60 && change <  7.95) {          // 50c
104    money += 50;
105    flag = 7.80;
106  }
107  else  if (change > 7.30 && change < 7.50) {          // 1E
108    money += 100;
109    flag  = 7.40;
110  }
111  else if (change > 8.20 && change < 9.00) {          // 2E
112    money += 200;
113    flag = 8.50;
114  }
115}
116
117//  :
118void standard()  {
119  lcd.setCursor(0,0);
120  lcd.print(" Standard mode! "); 
121  lcd.setCursor(0,1);                                 //    1  2 !
122  lcd.print("Weight: ");
123  if (prevWeight != round(scale.get_units(10)) ) {     //   ,
124    newWeight =  scale.get_units(10);                   //     
125  }
126  lcd.setCursor(9,1);
127  if (newWeight < 0) { scale.tare(); }
128  else { lcd.print(newWeight); }
129  prevWeight  = newWeight;                             //    
130
131}
132///////////////////////////////////
133
134void  multiMoney() {
135  lcd.setCursor(0,0);
136  lcd.print("  Money multi!  ");
137  lcd.setCursor(0,1);
138  lcd.print("Euro: ");
139  if (prevWeight != round(scale.get_units(10))  ) {    
140    newWeight = scale.get_units(10);
141    change = newWeight - prevWeight;
142    analysis();
143    lcd.setCursor(6,1);
144    lcd.print(money / 100.00);
145    prevWeight = newWeight;          
146  }
147}
148//////////////////////////////////////////
149
150void  massMoney() {
151  if (prevWeight != round(scale.get_units(20)) ) {    
152    newWeight  = scale.get_units(20); 
153    change = newWeight - prevWeight;
154    prevWeight  = newWeight;
155    if (change > 1) {
156      lcd.setCursor(0,1);
157      lcd.print("C:");
158      lcd.setCursor(2,1);
159      lcd.print(show);
160      lcd.setCursor(7,1);
161      lcd.print("A:");
162      lcd.setCursor(10,1);
163      lcd.print(show *  money / 100);
164      show = show + round(change / flag);  
165    }
166  }
167}
168//////////////////////////////////////
169
170void  itemsMass() {
171  if (prevWeight != round(scale.get_units(10)) ) {    
172    newWeight  = scale.get_units(10);
173    change = newWeight - prevWeight;
174    amount = round(change  / itemWeight);
175    lcd.setCursor(0,1);
176    lcd.print("Items: ");
177    lcd.print(amount);
178    lcd.setCursor(9,1);
179    lcd.print("W:");
180    lcd.print(newWeight);
181  }
182}
183//////////////////////////////////////////
184
185
186void loop() {
187  if (millis() - lastTime > 100) {
188    if (digitalRead(tara) == 1) {
189      reload();
190      scale.tare();
191    }
192    lastTime = millis();
193  }
194  
195  if (pos  == 1) {
196    myClear();
197    lcd.setCursor(4,0); 
198    lcd.print("Standard");
199    delay(1000);
200    myClear();
201    while (pos == 1) {
202      standard();
203    } 
204  }
205
206  else if (pos == 2) {
207    myClear();
208    lcd.setCursor(3,0);
209    lcd.print("Money multi");
210    delay(1000);
211    myClear();
212    while  (pos == 2) {
213      multiMoney();  
214    }
215  }
216
217  else if (pos == 3)  {
218    myClear();
219    lcd.setCursor(3,0);
220    lcd.print("Money mass");
221    delay(1000);
222    myClear();
223    lcd.print("Place ONE coin!"); 
224    while  (money == 0) {
225      if (prevWeight != round(scale.get_units(10)) ) {    
226        newWeight = scale.get_units(10);
227        change = newWeight - prevWeight;
228        analysis();
229        lcd.setCursor(0,1);
230        lcd.print(money /  100);
231        prevWeight = newWeight;          
232      }
233    }
234    myClear();
235    lcd.print("Counting ");
236    if (money < 100) {
237      lcd.setCursor(10,0);
238      lcd.print(money);
239      lcd.print("c");
240    }
241    else {
242      lcd.setCursor(10,0);
243      if (money == 100) { lcd.print("1 Euro"); }
244      else { lcd.print("2  Euro"); }
245    }
246    prevWeight = 0;
247    newWeight = 0;
248    change =  0;
249    while (pos == 3) {
250      massMoney();
251    }
252  }
253  
254
255  else if (pos == 4) {
256    myClear();
257    lcd.setCursor(3,0);
258    lcd.print("Items  mass");
259    delay(1000);
260    myClear();
261    myClear();
262    lcd.print("Place  ONE item!");
263    while (newWeight < 1) {
264      if (prevWeight != round(scale.get_units(10))  ) {    
265        newWeight = scale.get_units(10);
266        itemWeight = newWeight  - prevWeight;
267      }
268    }
269    itemWeight = newWeight - prevWeight;
270    lcd.setCursor(0,0);
271    lcd.print("Item weight:");
272    lcd.print(itemWeight);
273    while (pos == 4) {
274      itemsMass();
275    }
276  }
277}
278

#include <LiquidCrystal_I2C.h>
#include <HX711.h>

HX711 scale(A1,  A0); 
LiquidCrystal_I2C lcd(0x3F,16,2);


// 
volatile float newWeight;
volatile  float prevWeight;
volatile float money;
volatile float item;
volatile float  change;
volatile float flag;
volatile int show = 1;
volatile float itemWeight;
volatile  int amount;

int tara = 4;
unsigned long int lastTime;

int up =  2;
int down = 3;
volatile int pos = 1;


void setup() {
  lcd.init();                                         //   
  lcd.backlight();                                    //  
  scale.set_scale(-1537.34);                          //    (   )
  scale.tare();                                       //  
  prevWeight = 0;                                     //    
  scale.power_up();

  Serial.begin(9600);
  
  pinMode(tara,  INPUT);
  pinMode(up, INPUT);
  attachInterrupt(0, dec, RISING);
  pinMode(down,  INPUT);
  attachInterrupt(1, inc, RISING);

}

void myClear() {
    lcd.setCursor(0,0);
    lcd.print("                ");
    lcd.setCursor(0,1);
    lcd.print("                ");
    lcd.setCursor(0,0);
  }

void  reload() {
  prevWeight = 0;
  newWeight = 0;
  money = 0;
  item =  0;
  change = 0;
  show = 1;
}

void dec() {
  reload();
  if  (pos > 1) {
    pos -= 1; 
  }
  else {
    pos = 4;  
  }
}

void  inc() {
  reload();
  if (pos < 4) {
    pos += 1;  
  }
  else {
    pos = 1;  
  }    
}

void analysis() {
  if (change > 1.00 &&  change < 2.40) {               // 1c           
    money += 1;
    flag =  1.25;
  }
  else if (change > 2.80 && change < 3.15) {          // 2c
    money += 2;
    flag = 2.50;
  }
  else if (change > 3.70 && change  < 3.99) {          // 5c
    money += 5;
    flag = 3.80;
  }
  else  if (change > 4.00 && change < 4.15) {          // 10c
    money += 10;
    flag  = 4;
  }
  else if (change > 5.50 && change < 6.80) {          // 20c
    money += 20;
    flag = 6;
  }
  else if (change > 7.60 && change <  7.95) {          // 50c
    money += 50;
    flag = 7.80;
  }
  else  if (change > 7.30 && change < 7.50) {          // 1E
    money += 100;
    flag  = 7.40;
  }
  else if (change > 8.20 && change < 9.00) {          // 2E
    money += 200;
    flag = 8.50;
  }
}

//  :
void standard()  {
  lcd.setCursor(0,0);
  lcd.print(" Standard mode! "); 
  lcd.setCursor(0,1);                                 //    1  2 !
  lcd.print("Weight: ");
  if (prevWeight != round(scale.get_units(10)) ) {     //   ,
    newWeight =  scale.get_units(10);                   //     
  }
  lcd.setCursor(9,1);
  if (newWeight < 0) { scale.tare(); }
  else { lcd.print(newWeight); }
  prevWeight  = newWeight;                             //    

}
///////////////////////////////////

void  multiMoney() {
  lcd.setCursor(0,0);
  lcd.print("  Money multi!  ");
  lcd.setCursor(0,1);
  lcd.print("Euro: ");
  if (prevWeight != round(scale.get_units(10))  ) {    
    newWeight = scale.get_units(10);
    change = newWeight - prevWeight;
    analysis();
    lcd.setCursor(6,1);
    lcd.print(money / 100.00);
    prevWeight = newWeight;          
  }
}
//////////////////////////////////////////

void  massMoney() {
  if (prevWeight != round(scale.get_units(20)) ) {    
    newWeight  = scale.get_units(20); 
    change = newWeight - prevWeight;
    prevWeight  = newWeight;
    if (change > 1) {
      lcd.setCursor(0,1);
      lcd.print("C:");
      lcd.setCursor(2,1);
      lcd.print(show);
      lcd.setCursor(7,1);
      lcd.print("A:");
      lcd.setCursor(10,1);
      lcd.print(show *  money / 100);
      show = show + round(change / flag);  
    }
  }
}
//////////////////////////////////////

void  itemsMass() {
  if (prevWeight != round(scale.get_units(10)) ) {    
    newWeight  = scale.get_units(10);
    change = newWeight - prevWeight;
    amount = round(change  / itemWeight);
    lcd.setCursor(0,1);
    lcd.print("Items: ");
    lcd.print(amount);
    lcd.setCursor(9,1);
    lcd.print("W:");
    lcd.print(newWeight);
  }
}
//////////////////////////////////////////


void loop() {
  if (millis() - lastTime > 100) {
    if (digitalRead(tara) == 1) {
      reload();
      scale.tare();
    }
    lastTime = millis();
  }
  
  if (pos  == 1) {
    myClear();
    lcd.setCursor(4,0); 
    lcd.print("Standard");
    delay(1000);
    myClear();
    while (pos == 1) {
      standard();
    } 
  }

  else if (pos == 2) {
    myClear();
    lcd.setCursor(3,0);
    lcd.print("Money multi");
    delay(1000);
    myClear();
    while  (pos == 2) {
      multiMoney();  
    }
  }

  else if (pos == 3)  {
    myClear();
    lcd.setCursor(3,0);
    lcd.print("Money mass");
    delay(1000);
    myClear();
    lcd.print("Place ONE coin!"); 
    while  (money == 0) {
      if (prevWeight != round(scale.get_units(10)) ) {    
        newWeight = scale.get_units(10);
        change = newWeight - prevWeight;
        analysis();
        lcd.setCursor(0,1);
        lcd.print(money /  100);
        prevWeight = newWeight;          
      }
    }
    myClear();
    lcd.print("Counting ");
    if (money < 100) {
      lcd.setCursor(10,0);
      lcd.print(money);
      lcd.print("c");
    }
    else {
      lcd.setCursor(10,0);
      if (money == 100) { lcd.print("1 Euro"); }
      else { lcd.print("2  Euro"); }
    }
    prevWeight = 0;
    newWeight = 0;
    change =  0;
    while (pos == 3) {
      massMoney();
    }
  }
  

  else if (pos == 4) {
    myClear();
    lcd.setCursor(3,0);
    lcd.print("Items  mass");
    delay(1000);
    myClear();
    myClear();
    lcd.print("Place  ONE item!");
    while (newWeight < 1) {
      if (prevWeight != round(scale.get_units(10))  ) {    
        newWeight = scale.get_units(10);
        itemWeight = newWeight  - prevWeight;
      }
    }
    itemWeight = newWeight - prevWeight;
    lcd.setCursor(0,0);
    lcd.print("Item weight:");
    lcd.print(itemWeight);
    while (pos == 4) {
      itemsMass();
    }
  }
}

Downloadable files

The connection of the HX711 module

HX711 Library

Documentation

The 3d model, altough it is just a prototype.

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mPelectronic

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