Cool Way to Count the Euro Coins!

This is a cool way to count the coins using a scale with Arduino Nano.

May 9, 2021

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1 respects

scale

coins

money

Components and supplies

Push Button

Arduino Nano R3

Scale with HX711 interface

OLED 128x32 Display

Project description

Code

Coin Counter Arduino Code

arduino

1//
2//    FILE: Coin_Count.ino
3//    AUTHOR: Carlo Stramaglia
4//     URL: https://www.youtube.com/c/CarloStramaglia
5//
6
7
8#include "HX711.h"
9#include   <U8x8lib.h>
10#include "OneButton.h"
11
12HX711 scale;
13
14uint8_t dataPin   = 6;
15uint8_t clockPin = 7;
16OneButton button(4, true);
17U8X8_SSD1306_128X32_UNIVISION_SW_I2C   u8x8(/* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);
18
19int status   = 0;
20float Cent = 0;
21float TwoCent = 0;
22float FiveCent = 0;
23float TenCent   = 0;
24float TwentyCent = 0;
25float FiftyCent = 0;
26float OneEuro = 0;
27float   TwoEuro = 0;
28int TotalCents = 0;
29float TotalEuro = 0;
30
31
32
33void   setup()
34{
35  Serial.begin(115200);
36  scale.begin(dataPin, clockPin);
37   u8x8.begin();
38  u8x8.setPowerSave(0);
39  button.attachClick(Click);
40}
41
42void   loop()
43{
44  char ValueEuro [8];
45  button.tick();
46  u8x8.setFont(u8x8_font_chroma48medium8_r);
47   delay (50);
48 
49  if (status == 0) {
50         Serial.println("\
51Empty   the scale and press the button to continue");
52         u8x8.drawString(0,1,"Empty   scale");
53         u8x8.drawString(0,2,"Press button");
54         u8x8.drawString(0,3,"To   Continue");
55         }
56  if (status == 1) {
57         Serial.println("\
58Place   4 coins of 2 and press the button to continue");
59         u8x8.drawString(0,1,"Put   4 2E coins");
60         u8x8.drawString(0,2,"Press button");
61         u8x8.drawString(0,3,"To   Continue");
62         }
63  if (status == 2) {
64         Serial.println("\
65Place   1 Cent coins and press the button to continue");
66         u8x8.drawString(0,1,"Put   1 cent coins");
67         u8x8.drawString(0,2,"Press button");
68         u8x8.drawString(0,3,"To   Continue");
69         }  
70  if (status == 3) {
71         Serial.println("\
72Add   2 Cents coins and press the button to continue");
73         u8x8.drawString(0,1,"Put   2 cent coins");
74         u8x8.drawString(0,2,"Press button");
75         u8x8.drawString(0,3,"To   Continue");
76         }  
77  if (status == 4) {
78         Serial.println("\
79Add   5 Cents coins and press the button to continue");
80         u8x8.drawString(0,1,"Put   5 cent coins");
81         u8x8.drawString(0,2,"Press button");
82         u8x8.drawString(0,3,"To   Continue");
83         }  
84  if (status == 5) {
85         Serial.println("\
86Add   10 Cents coins and press the button to continue");
87         u8x8.drawString(0,1,"Put   10 cent coin");
88         u8x8.drawString(0,2,"Press button");
89         u8x8.drawString(0,3,"To   Continue");
90         } 
91  if (status == 6) {
92         Serial.println("\
93Add   20 Cents coins and press the button to continue");
94         u8x8.drawString(0,1,"Put   20 cent coin");
95         u8x8.drawString(0,2,"Press button");
96         u8x8.drawString(0,3,"To   Continue");
97         } 
98  if (status == 7) {
99         Serial.println("\
100Add   50 Cents coins and press the button to continue");
101         u8x8.drawString(0,1,"Put   50 cent coin");
102         u8x8.drawString(0,2,"Press button");
103         u8x8.drawString(0,3,"To   Continue");
104         } 
105  if (status == 8) {
106         Serial.println("\
107Add   1 Euro coins and press the button to continue");
108         u8x8.drawString(0,1,"Put   1 Euro coins");
109         u8x8.drawString(0,2,"Press button");
110         u8x8.drawString(0,3,"To   Continue");
111         } 
112  if (status == 9) {
113         Serial.println("\
114Add   2 Euro coins and press the button to continue");
115         u8x8.drawString(0,1,"Put   2 Euro coins");
116         u8x8.drawString(0,2,"Press button");
117         u8x8.drawString(0,3,"To   Continue");
118         }
119  if (status == 10) {
120         sprintf(ValueEuro,   "%d", TotalEuro);
121         dtostrf(TotalEuro, 2, 2, ValueEuro);
122         u8x8.drawString(0,1,ValueEuro);
123          ValueEuro[5]=byte(0xb0);
124         ValueEuro[6]='C';
125         ValueEuro[7]='\\0';
126          u8x8.drawString(0,2,"              ");
127         u8x8.drawString(0,3,"End   of process");
128         Serial.println(ValueEuro);
129         }          
130          
131//  Serial.print("UNITS: ");
132//  Serial.println(scale.get_units(10));
133//   delay(150);
134}
135
136void Click() {
137  Serial.println ("Button pressed");
138   if (status == 9) {
139      Serial.read();
140      Serial.print("2 Euro Coins   float: ");
141      TwoEuro = scale.get_units(10)-Cent-TwoCent-FiveCent-TenCent-TwentyCent-FiftyCent-OneEuro;
142       TotalCents = TotalCents + ((int (TwoEuro/8.50+0.5))*200);
143      TotalEuro   = (float) TotalCents/100;
144      Serial.print("Total Cents so far: ");
145      Serial.println(TotalEuro);
146       status = 10;
147      Serial.print("");    
148  }
149  else if (status   == 8) {
150      Serial.read();
151      Serial.print("1 Euro Coins float: ");
152       OneEuro = scale.get_units(10)-Cent-TwoCent-FiveCent-TenCent-TwentyCent-FiftyCent;
153       TotalCents = TotalCents + ((int (OneEuro/7.50+0.5))*100);
154      Serial.print("Total   Cents so far: ");
155      Serial.println(TotalCents);
156      status = 9;
157       Serial.print("");    
158  }
159  else if (status == 7) {
160      Serial.read();
161       Serial.print("50 Cent Coins float: ");
162      FiftyCent = scale.get_units(10)-Cent-TwoCent-FiveCent-TenCent-TwentyCent;
163       TotalCents = TotalCents + ((int (FiftyCent/7.80+0.5))*50);
164      Serial.print("Total   Cents so far: ");
165      Serial.println(TotalCents);
166      status = 8;
167       Serial.print("");    
168  }
169  else if (status == 6) {
170      Serial.read();
171       Serial.print("20 Cent Coins float: ");
172      TwentyCent = scale.get_units(10)-Cent-TwoCent-FiveCent-TenCent;
173       TotalCents = TotalCents + ((int (TwentyCent/5.74+0.5))*20);
174      Serial.print("Total   Cents so far: ");
175      Serial.println(TotalCents);
176      status = 7;
177       Serial.print("");    
178  }
179  else if (status == 5) {
180      Serial.read();
181       Serial.print("10 Cent Coins float: ");
182      TenCent = scale.get_units(10)-Cent-TwoCent-FiveCent;
183       TotalCents = TotalCents + ((int (TenCent/4.1+0.5))*10);
184      Serial.print("Total   Cents so far: ");
185      Serial.println(TotalCents);
186      status = 6;
187       Serial.print("");    
188  }
189  else if (status == 4) {
190      Serial.read();
191       Serial.print("5 Cent Coins float: ");
192      FiveCent = scale.get_units(10)-Cent-TwoCent;
193       TotalCents = TotalCents + ((int (FiveCent/3.92+0.5))*5);
194      Serial.print("Total   Cents so far: ");
195      Serial.println(TotalCents);
196      status = 5;
197       Serial.print("");    
198  }
199  else if (status == 3) {
200      Serial.read();
201       Serial.print("2 Cent Coins float: ");
202      TwoCent = scale.get_units(10)-Cent;
203       TotalCents = TotalCents + ((int (TwoCent/3.06+0.5))*2);
204      Serial.print("Total   Cents so far: ");
205      Serial.println(TotalCents);
206      status = 4;
207       Serial.print("");    
208  }
209  else if (status == 2) {
210      Serial.read();
211       Serial.print("1 Cent Coins float: ");
212      Cent = scale.get_units(10);
213       TotalCents = int (Cent/2.30+0.5);
214      Serial.print("Total Cents so far:   ");
215      Serial.println(TotalCents);
216      status = 3;
217      Serial.print("");     
218  }
219  else if (status == 1) {
220      Serial.read();
221      scale.callibrate_scale(34,   5);
222      Serial.print("Grams: ");
223      Serial.println(scale.get_units(10));
224       status = 2;
225      Serial.print("Calibrated");    
226  }
227  else if   (status == 0) {
228      Serial.read();
229      scale.tare();
230      Serial.print("Grams:   ");
231      Serial.println(scale.get_units(10));
232      status = 1;    
233   }
234
235    
236} 
237

//
//    FILE: Coin_Count.ino
//    AUTHOR: Carlo Stramaglia
//     URL: https://www.youtube.com/c/CarloStramaglia
//


#include "HX711.h"
#include   <U8x8lib.h>
#include "OneButton.h"

HX711 scale;

uint8_t dataPin   = 6;
uint8_t clockPin = 7;
OneButton button(4, true);
U8X8_SSD1306_128X32_UNIVISION_SW_I2C   u8x8(/* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);

int status   = 0;
float Cent = 0;
float TwoCent = 0;
float FiveCent = 0;
float TenCent   = 0;
float TwentyCent = 0;
float FiftyCent = 0;
float OneEuro = 0;
float   TwoEuro = 0;
int TotalCents = 0;
float TotalEuro = 0;



void   setup()
{
  Serial.begin(115200);
  scale.begin(dataPin, clockPin);
   u8x8.begin();
  u8x8.setPowerSave(0);
  button.attachClick(Click);
}

void   loop()
{
  char ValueEuro [8];
  button.tick();
  u8x8.setFont(u8x8_font_chroma48medium8_r);
   delay (50);
 
  if (status == 0) {
         Serial.println("\
Empty   the scale and press the button to continue");
         u8x8.drawString(0,1,"Empty   scale");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To   Continue");
         }
  if (status == 1) {
         Serial.println("\
Place   4 coins of 2 and press the button to continue");
         u8x8.drawString(0,1,"Put   4 2E coins");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To   Continue");
         }
  if (status == 2) {
         Serial.println("\
Place   1 Cent coins and press the button to continue");
         u8x8.drawString(0,1,"Put   1 cent coins");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To   Continue");
         }  
  if (status == 3) {
         Serial.println("\
Add   2 Cents coins and press the button to continue");
         u8x8.drawString(0,1,"Put   2 cent coins");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To   Continue");
         }  
  if (status == 4) {
         Serial.println("\
Add   5 Cents coins and press the button to continue");
         u8x8.drawString(0,1,"Put   5 cent coins");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To   Continue");
         }  
  if (status == 5) {
         Serial.println("\
Add   10 Cents coins and press the button to continue");
         u8x8.drawString(0,1,"Put   10 cent coin");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To   Continue");
         } 
  if (status == 6) {
         Serial.println("\
Add   20 Cents coins and press the button to continue");
         u8x8.drawString(0,1,"Put   20 cent coin");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To   Continue");
         } 
  if (status == 7) {
         Serial.println("\
Add   50 Cents coins and press the button to continue");
         u8x8.drawString(0,1,"Put   50 cent coin");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To   Continue");
         } 
  if (status == 8) {
         Serial.println("\
Add   1 Euro coins and press the button to continue");
         u8x8.drawString(0,1,"Put   1 Euro coins");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To   Continue");
         } 
  if (status == 9) {
         Serial.println("\
Add   2 Euro coins and press the button to continue");
         u8x8.drawString(0,1,"Put   2 Euro coins");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To   Continue");
         }
  if (status == 10) {
         sprintf(ValueEuro,   "%d", TotalEuro);
         dtostrf(TotalEuro, 2, 2, ValueEuro);
         u8x8.drawString(0,1,ValueEuro);
          ValueEuro[5]=byte(0xb0);
         ValueEuro[6]='C';
         ValueEuro[7]='\\0';
          u8x8.drawString(0,2,"              ");
         u8x8.drawString(0,3,"End   of process");
         Serial.println(ValueEuro);
         }          
          
//  Serial.print("UNITS: ");
//  Serial.println(scale.get_units(10));
//   delay(150);
}

void Click() {
  Serial.println ("Button pressed");
   if (status == 9) {
      Serial.read();
      Serial.print("2 Euro Coins   float: ");
      TwoEuro = scale.get_units(10)-Cent-TwoCent-FiveCent-TenCent-TwentyCent-FiftyCent-OneEuro;
       TotalCents = TotalCents + ((int (TwoEuro/8.50+0.5))*200);
      TotalEuro   = (float) TotalCents/100;
      Serial.print("Total Cents so far: ");
      Serial.println(TotalEuro);
       status = 10;
      Serial.print("");    
  }
  else if (status   == 8) {
      Serial.read();
      Serial.print("1 Euro Coins float: ");
       OneEuro = scale.get_units(10)-Cent-TwoCent-FiveCent-TenCent-TwentyCent-FiftyCent;
       TotalCents = TotalCents + ((int (OneEuro/7.50+0.5))*100);
      Serial.print("Total   Cents so far: ");
      Serial.println(TotalCents);
      status = 9;
       Serial.print("");    
  }
  else if (status == 7) {
      Serial.read();
       Serial.print("50 Cent Coins float: ");
      FiftyCent = scale.get_units(10)-Cent-TwoCent-FiveCent-TenCent-TwentyCent;
       TotalCents = TotalCents + ((int (FiftyCent/7.80+0.5))*50);
      Serial.print("Total   Cents so far: ");
      Serial.println(TotalCents);
      status = 8;
       Serial.print("");    
  }
  else if (status == 6) {
      Serial.read();
       Serial.print("20 Cent Coins float: ");
      TwentyCent = scale.get_units(10)-Cent-TwoCent-FiveCent-TenCent;
       TotalCents = TotalCents + ((int (TwentyCent/5.74+0.5))*20);
      Serial.print("Total   Cents so far: ");
      Serial.println(TotalCents);
      status = 7;
       Serial.print("");    
  }
  else if (status == 5) {
      Serial.read();
       Serial.print("10 Cent Coins float: ");
      TenCent = scale.get_units(10)-Cent-TwoCent-FiveCent;
       TotalCents = TotalCents + ((int (TenCent/4.1+0.5))*10);
      Serial.print("Total   Cents so far: ");
      Serial.println(TotalCents);
      status = 6;
       Serial.print("");    
  }
  else if (status == 4) {
      Serial.read();
       Serial.print("5 Cent Coins float: ");
      FiveCent = scale.get_units(10)-Cent-TwoCent;
       TotalCents = TotalCents + ((int (FiveCent/3.92+0.5))*5);
      Serial.print("Total   Cents so far: ");
      Serial.println(TotalCents);
      status = 5;
       Serial.print("");    
  }
  else if (status == 3) {
      Serial.read();
       Serial.print("2 Cent Coins float: ");
      TwoCent = scale.get_units(10)-Cent;
       TotalCents = TotalCents + ((int (TwoCent/3.06+0.5))*2);
      Serial.print("Total   Cents so far: ");
      Serial.println(TotalCents);
      status = 4;
       Serial.print("");    
  }
  else if (status == 2) {
      Serial.read();
       Serial.print("1 Cent Coins float: ");
      Cent = scale.get_units(10);
       TotalCents = int (Cent/2.30+0.5);
      Serial.print("Total Cents so far:   ");
      Serial.println(TotalCents);
      status = 3;
      Serial.print("");     
  }
  else if (status == 1) {
      Serial.read();
      scale.callibrate_scale(34,   5);
      Serial.print("Grams: ");
      Serial.println(scale.get_units(10));
       status = 2;
      Serial.print("Calibrated");    
  }
  else if   (status == 0) {
      Serial.read();
      scale.tare();
      Serial.print("Grams:   ");
      Serial.println(scale.get_units(10));
      status = 1;    
   }

    
}

Coin Counter Arduino Code

arduino

1//
2//    FILE: Coin_Count.ino
3//    AUTHOR: Carlo Stramaglia
4//    URL: https://www.youtube.com/c/CarloStramaglia
5//
6
7
8#include "HX711.h"
9#include  <U8x8lib.h>
10#include "OneButton.h"
11
12HX711 scale;
13
14uint8_t dataPin  = 6;
15uint8_t clockPin = 7;
16OneButton button(4, true);
17U8X8_SSD1306_128X32_UNIVISION_SW_I2C  u8x8(/* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);
18
19int status  = 0;
20float Cent = 0;
21float TwoCent = 0;
22float FiveCent = 0;
23float TenCent  = 0;
24float TwentyCent = 0;
25float FiftyCent = 0;
26float OneEuro = 0;
27float  TwoEuro = 0;
28int TotalCents = 0;
29float TotalEuro = 0;
30
31
32
33void  setup()
34{
35  Serial.begin(115200);
36  scale.begin(dataPin, clockPin);
37  u8x8.begin();
38  u8x8.setPowerSave(0);
39  button.attachClick(Click);
40}
41
42void  loop()
43{
44  char ValueEuro [8];
45  button.tick();
46  u8x8.setFont(u8x8_font_chroma48medium8_r);
47  delay (50);
48 
49  if (status == 0) {
50         Serial.println("\
51Empty  the scale and press the button to continue");
52         u8x8.drawString(0,1,"Empty  scale");
53         u8x8.drawString(0,2,"Press button");
54         u8x8.drawString(0,3,"To  Continue");
55         }
56  if (status == 1) {
57         Serial.println("\
58Place  4 coins of 2 and press the button to continue");
59         u8x8.drawString(0,1,"Put  4 2E coins");
60         u8x8.drawString(0,2,"Press button");
61         u8x8.drawString(0,3,"To  Continue");
62         }
63  if (status == 2) {
64         Serial.println("\
65Place  1 Cent coins and press the button to continue");
66         u8x8.drawString(0,1,"Put  1 cent coins");
67         u8x8.drawString(0,2,"Press button");
68         u8x8.drawString(0,3,"To  Continue");
69         }  
70  if (status == 3) {
71         Serial.println("\
72Add  2 Cents coins and press the button to continue");
73         u8x8.drawString(0,1,"Put  2 cent coins");
74         u8x8.drawString(0,2,"Press button");
75         u8x8.drawString(0,3,"To  Continue");
76         }  
77  if (status == 4) {
78         Serial.println("\
79Add  5 Cents coins and press the button to continue");
80         u8x8.drawString(0,1,"Put  5 cent coins");
81         u8x8.drawString(0,2,"Press button");
82         u8x8.drawString(0,3,"To  Continue");
83         }  
84  if (status == 5) {
85         Serial.println("\
86Add  10 Cents coins and press the button to continue");
87         u8x8.drawString(0,1,"Put  10 cent coin");
88         u8x8.drawString(0,2,"Press button");
89         u8x8.drawString(0,3,"To  Continue");
90         } 
91  if (status == 6) {
92         Serial.println("\
93Add  20 Cents coins and press the button to continue");
94         u8x8.drawString(0,1,"Put  20 cent coin");
95         u8x8.drawString(0,2,"Press button");
96         u8x8.drawString(0,3,"To  Continue");
97         } 
98  if (status == 7) {
99         Serial.println("\
100Add  50 Cents coins and press the button to continue");
101         u8x8.drawString(0,1,"Put  50 cent coin");
102         u8x8.drawString(0,2,"Press button");
103         u8x8.drawString(0,3,"To  Continue");
104         } 
105  if (status == 8) {
106         Serial.println("\
107Add  1 Euro coins and press the button to continue");
108         u8x8.drawString(0,1,"Put  1 Euro coins");
109         u8x8.drawString(0,2,"Press button");
110         u8x8.drawString(0,3,"To  Continue");
111         } 
112  if (status == 9) {
113         Serial.println("\
114Add  2 Euro coins and press the button to continue");
115         u8x8.drawString(0,1,"Put  2 Euro coins");
116         u8x8.drawString(0,2,"Press button");
117         u8x8.drawString(0,3,"To  Continue");
118         }
119  if (status == 10) {
120         sprintf(ValueEuro,  "%d", TotalEuro);
121         dtostrf(TotalEuro, 2, 2, ValueEuro);
122         u8x8.drawString(0,1,ValueEuro);
123         ValueEuro[5]=byte(0xb0);
124         ValueEuro[6]='C';
125         ValueEuro[7]='\\0';
126         u8x8.drawString(0,2,"              ");
127         u8x8.drawString(0,3,"End  of process");
128         Serial.println(ValueEuro);
129         }          
130         
131//  Serial.print("UNITS: ");
132//  Serial.println(scale.get_units(10));
133//  delay(150);
134}
135
136void Click() {
137  Serial.println ("Button pressed");
138  if (status == 9) {
139      Serial.read();
140      Serial.print("2 Euro Coins  float: ");
141      TwoEuro = scale.get_units(10)-Cent-TwoCent-FiveCent-TenCent-TwentyCent-FiftyCent-OneEuro;
142      TotalCents = TotalCents + ((int (TwoEuro/8.50+0.5))*200);
143      TotalEuro  = (float) TotalCents/100;
144      Serial.print("Total Cents so far: ");
145      Serial.println(TotalEuro);
146      status = 10;
147      Serial.print("");    
148  }
149  else if (status  == 8) {
150      Serial.read();
151      Serial.print("1 Euro Coins float: ");
152      OneEuro = scale.get_units(10)-Cent-TwoCent-FiveCent-TenCent-TwentyCent-FiftyCent;
153      TotalCents = TotalCents + ((int (OneEuro/7.50+0.5))*100);
154      Serial.print("Total  Cents so far: ");
155      Serial.println(TotalCents);
156      status = 9;
157      Serial.print("");    
158  }
159  else if (status == 7) {
160      Serial.read();
161      Serial.print("50 Cent Coins float: ");
162      FiftyCent = scale.get_units(10)-Cent-TwoCent-FiveCent-TenCent-TwentyCent;
163      TotalCents = TotalCents + ((int (FiftyCent/7.80+0.5))*50);
164      Serial.print("Total  Cents so far: ");
165      Serial.println(TotalCents);
166      status = 8;
167      Serial.print("");    
168  }
169  else if (status == 6) {
170      Serial.read();
171      Serial.print("20 Cent Coins float: ");
172      TwentyCent = scale.get_units(10)-Cent-TwoCent-FiveCent-TenCent;
173      TotalCents = TotalCents + ((int (TwentyCent/5.74+0.5))*20);
174      Serial.print("Total  Cents so far: ");
175      Serial.println(TotalCents);
176      status = 7;
177      Serial.print("");    
178  }
179  else if (status == 5) {
180      Serial.read();
181      Serial.print("10 Cent Coins float: ");
182      TenCent = scale.get_units(10)-Cent-TwoCent-FiveCent;
183      TotalCents = TotalCents + ((int (TenCent/4.1+0.5))*10);
184      Serial.print("Total  Cents so far: ");
185      Serial.println(TotalCents);
186      status = 6;
187      Serial.print("");    
188  }
189  else if (status == 4) {
190      Serial.read();
191      Serial.print("5 Cent Coins float: ");
192      FiveCent = scale.get_units(10)-Cent-TwoCent;
193      TotalCents = TotalCents + ((int (FiveCent/3.92+0.5))*5);
194      Serial.print("Total  Cents so far: ");
195      Serial.println(TotalCents);
196      status = 5;
197      Serial.print("");    
198  }
199  else if (status == 3) {
200      Serial.read();
201      Serial.print("2 Cent Coins float: ");
202      TwoCent = scale.get_units(10)-Cent;
203      TotalCents = TotalCents + ((int (TwoCent/3.06+0.5))*2);
204      Serial.print("Total  Cents so far: ");
205      Serial.println(TotalCents);
206      status = 4;
207      Serial.print("");    
208  }
209  else if (status == 2) {
210      Serial.read();
211      Serial.print("1 Cent Coins float: ");
212      Cent = scale.get_units(10);
213      TotalCents = int (Cent/2.30+0.5);
214      Serial.print("Total Cents so far:  ");
215      Serial.println(TotalCents);
216      status = 3;
217      Serial.print("");    
218  }
219  else if (status == 1) {
220      Serial.read();
221      scale.callibrate_scale(34,  5);
222      Serial.print("Grams: ");
223      Serial.println(scale.get_units(10));
224      status = 2;
225      Serial.print("Calibrated");    
226  }
227  else if  (status == 0) {
228      Serial.read();
229      scale.tare();
230      Serial.print("Grams:  ");
231      Serial.println(scale.get_units(10));
232      status = 1;    
233  }
234
235    
236} 
237

//
//    FILE: Coin_Count.ino
//    AUTHOR: Carlo Stramaglia
//    URL: https://www.youtube.com/c/CarloStramaglia
//


#include "HX711.h"
#include  <U8x8lib.h>
#include "OneButton.h"

HX711 scale;

uint8_t dataPin  = 6;
uint8_t clockPin = 7;
OneButton button(4, true);
U8X8_SSD1306_128X32_UNIVISION_SW_I2C  u8x8(/* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);

int status  = 0;
float Cent = 0;
float TwoCent = 0;
float FiveCent = 0;
float TenCent  = 0;
float TwentyCent = 0;
float FiftyCent = 0;
float OneEuro = 0;
float  TwoEuro = 0;
int TotalCents = 0;
float TotalEuro = 0;



void  setup()
{
  Serial.begin(115200);
  scale.begin(dataPin, clockPin);
  u8x8.begin();
  u8x8.setPowerSave(0);
  button.attachClick(Click);
}

void  loop()
{
  char ValueEuro [8];
  button.tick();
  u8x8.setFont(u8x8_font_chroma48medium8_r);
  delay (50);
 
  if (status == 0) {
         Serial.println("\
Empty  the scale and press the button to continue");
         u8x8.drawString(0,1,"Empty  scale");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To  Continue");
         }
  if (status == 1) {
         Serial.println("\
Place  4 coins of 2 and press the button to continue");
         u8x8.drawString(0,1,"Put  4 2E coins");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To  Continue");
         }
  if (status == 2) {
         Serial.println("\
Place  1 Cent coins and press the button to continue");
         u8x8.drawString(0,1,"Put  1 cent coins");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To  Continue");
         }  
  if (status == 3) {
         Serial.println("\
Add  2 Cents coins and press the button to continue");
         u8x8.drawString(0,1,"Put  2 cent coins");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To  Continue");
         }  
  if (status == 4) {
         Serial.println("\
Add  5 Cents coins and press the button to continue");
         u8x8.drawString(0,1,"Put  5 cent coins");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To  Continue");
         }  
  if (status == 5) {
         Serial.println("\
Add  10 Cents coins and press the button to continue");
         u8x8.drawString(0,1,"Put  10 cent coin");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To  Continue");
         } 
  if (status == 6) {
         Serial.println("\
Add  20 Cents coins and press the button to continue");
         u8x8.drawString(0,1,"Put  20 cent coin");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To  Continue");
         } 
  if (status == 7) {
         Serial.println("\
Add  50 Cents coins and press the button to continue");
         u8x8.drawString(0,1,"Put  50 cent coin");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To  Continue");
         } 
  if (status == 8) {
         Serial.println("\
Add  1 Euro coins and press the button to continue");
         u8x8.drawString(0,1,"Put  1 Euro coins");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To  Continue");
         } 
  if (status == 9) {
         Serial.println("\
Add  2 Euro coins and press the button to continue");
         u8x8.drawString(0,1,"Put  2 Euro coins");
         u8x8.drawString(0,2,"Press button");
         u8x8.drawString(0,3,"To  Continue");
         }
  if (status == 10) {
         sprintf(ValueEuro,  "%d", TotalEuro);
         dtostrf(TotalEuro, 2, 2, ValueEuro);
         u8x8.drawString(0,1,ValueEuro);
         ValueEuro[5]=byte(0xb0);
         ValueEuro[6]='C';
         ValueEuro[7]='\\0';
         u8x8.drawString(0,2,"              ");
         u8x8.drawString(0,3,"End  of process");
         Serial.println(ValueEuro);
         }          
         
//  Serial.print("UNITS: ");
//  Serial.println(scale.get_units(10));
//  delay(150);
}

void Click() {
  Serial.println ("Button pressed");
  if (status == 9) {
      Serial.read();
      Serial.print("2 Euro Coins  float: ");
      TwoEuro = scale.get_units(10)-Cent-TwoCent-FiveCent-TenCent-TwentyCent-FiftyCent-OneEuro;
      TotalCents = TotalCents + ((int (TwoEuro/8.50+0.5))*200);
      TotalEuro  = (float) TotalCents/100;
      Serial.print("Total Cents so far: ");
      Serial.println(TotalEuro);
      status = 10;
      Serial.print("");    
  }
  else if (status  == 8) {
      Serial.read();
      Serial.print("1 Euro Coins float: ");
      OneEuro = scale.get_units(10)-Cent-TwoCent-FiveCent-TenCent-TwentyCent-FiftyCent;
      TotalCents = TotalCents + ((int (OneEuro/7.50+0.5))*100);
      Serial.print("Total  Cents so far: ");
      Serial.println(TotalCents);
      status = 9;
      Serial.print("");    
  }
  else if (status == 7) {
      Serial.read();
      Serial.print("50 Cent Coins float: ");
      FiftyCent = scale.get_units(10)-Cent-TwoCent-FiveCent-TenCent-TwentyCent;
      TotalCents = TotalCents + ((int (FiftyCent/7.80+0.5))*50);
      Serial.print("Total  Cents so far: ");
      Serial.println(TotalCents);
      status = 8;
      Serial.print("");    
  }
  else if (status == 6) {
      Serial.read();
      Serial.print("20 Cent Coins float: ");
      TwentyCent = scale.get_units(10)-Cent-TwoCent-FiveCent-TenCent;
      TotalCents = TotalCents + ((int (TwentyCent/5.74+0.5))*20);
      Serial.print("Total  Cents so far: ");
      Serial.println(TotalCents);
      status = 7;
      Serial.print("");    
  }
  else if (status == 5) {
      Serial.read();
      Serial.print("10 Cent Coins float: ");
      TenCent = scale.get_units(10)-Cent-TwoCent-FiveCent;
      TotalCents = TotalCents + ((int (TenCent/4.1+0.5))*10);
      Serial.print("Total  Cents so far: ");
      Serial.println(TotalCents);
      status = 6;
      Serial.print("");    
  }
  else if (status == 4) {
      Serial.read();
      Serial.print("5 Cent Coins float: ");
      FiveCent = scale.get_units(10)-Cent-TwoCent;
      TotalCents = TotalCents + ((int (FiveCent/3.92+0.5))*5);
      Serial.print("Total  Cents so far: ");
      Serial.println(TotalCents);
      status = 5;
      Serial.print("");    
  }
  else if (status == 3) {
      Serial.read();
      Serial.print("2 Cent Coins float: ");
      TwoCent = scale.get_units(10)-Cent;
      TotalCents = TotalCents + ((int (TwoCent/3.06+0.5))*2);
      Serial.print("Total  Cents so far: ");
      Serial.println(TotalCents);
      status = 4;
      Serial.print("");    
  }
  else if (status == 2) {
      Serial.read();
      Serial.print("1 Cent Coins float: ");
      Cent = scale.get_units(10);
      TotalCents = int (Cent/2.30+0.5);
      Serial.print("Total Cents so far:  ");
      Serial.println(TotalCents);
      status = 3;
      Serial.print("");    
  }
  else if (status == 1) {
      Serial.read();
      scale.callibrate_scale(34,  5);
      Serial.print("Grams: ");
      Serial.println(scale.get_units(10));
      status = 2;
      Serial.print("Calibrated");    
  }
  else if  (status == 0) {
      Serial.read();
      scale.tare();
      Serial.print("Grams:  ");
      Serial.println(scale.get_units(10));
      status = 1;    
  }

    
}

Downloadable files

Diagram of the Coin Counter project

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