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Basic Calculator

Basic calculator using the arduino mega and without the keypad library

Nov 5, 2017

•

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5 respects

calculator

arduino

Components and supplies

Arduino Mega 2560

Standard LCD - 16x2 White on Blue

Tools and machines

3D Printer (generic)

Soldering iron (generic)

Hot glue gun (generic)

Project description

Code

Calculator_Code.ino

arduino

Edit the pins where the lcd screen and buttons are connected. The code will work fine.

1#include <LiquidCrystal.h>
2
3LiquidCrystal lcd (8, 9, 10, 11, 12,  13);
4
5
6#define max_val 999999
7float firstNum = 0;
8float secondNum  = 0;
9float total = 0;
10int insertNum;
11int z = 1;
12int y = 0;
13long a;
14int  opAS = 0;
15int NUM = 0;
16int OP;
17
18int one =30;
19int two = 32;
20int  three = 42;
21int four =28;
22int five =26;
23int six = 46;
24int seven = 22;
25int  eight =24;
26int nine =50;
27int zero = 34;     //34
28int decimal = 36;
29int  addition = 38;
30int subtraction = 44;
31int multiplication =48;
32int division  = 52;
33int Clear = 7;
34int equal = 40;
35
36
37void readKey() {
38
39  if  (digitalRead(zero) == HIGH) {
40    insertNum = 0;
41  }
42   else if (digitalRead(one)  == HIGH) {
43    insertNum = 1;
44  }
45  else if (digitalRead(two) == HIGH)  {
46    insertNum = 2;
47  }
48  else if (digitalRead(three) == HIGH) {
49    insertNum  = 3;
50  }
51  else if (digitalRead(four) == HIGH) {
52    insertNum = 4;
53  }
54  else if (digitalRead(five) == HIGH) {
55    insertNum = 5;
56  }
57  else if (digitalRead(six) == HIGH) {
58    insertNum = 6;
59  }
60  else if  (digitalRead(seven) == HIGH) {
61    insertNum = 7;
62  }
63  else if (digitalRead(eight)  == HIGH) {
64    insertNum = 8;
65  }
66  else if (digitalRead(nine) == HIGH)  {
67    insertNum = 9;
68  }
69  else if (digitalRead(decimal) == HIGH) {
70    insertNum = 10;
71  }
72  else if (digitalRead(addition) == HIGH) {
73    insertNum  = 11;
74  }
75  else if (digitalRead(subtraction) == HIGH) {
76    insertNum  = 12;
77  }
78  else if (digitalRead(multiplication) == HIGH) {
79    insertNum  = 13;
80  }
81  else if (digitalRead(division) == HIGH) {
82    insertNum = 14;
83  }
84    else if (digitalRead(Clear) == HIGH) {
85    insertNum = 15;
86  }
87  else if (digitalRead(equal) == HIGH) {
88    insertNum = 16;
89  }
90else{
91  insertNum = -1;
92}
93
94
95
96}
97
98
99
100
101
102
103
104void setup()
105{
106pinMode(one,  INPUT);
107pinMode(two, INPUT);
108pinMode(three, INPUT);
109pinMode(four,INPUT);
110pinMode(five,  INPUT);
111pinMode(six, INPUT);
112pinMode(seven, INPUT);
113pinMode(eight, INPUT);
114pinMode(nine,  INPUT);
115pinMode(zero, INPUT);
116pinMode(decimal, INPUT);
117pinMode(addition,  INPUT);
118pinMode(subtraction, INPUT);
119pinMode(multiplication, INPUT);
120pinMode(division,  INPUT);
121pinMode(Clear, INPUT);
122pinMode(equal, INPUT);
123
124  
125lcd.begin(16,2);
126
127}
128
129void  loop(){
130readKey();
131delay(200);
132
133if(NUM == 0){
134if (insertNum >= 0  && insertNum <= 9){
135if(y==0){
136
137
138a = pow(10, z);
139firstNum = firstNum  * (float)a + (float)insertNum;
140}
141
142
143
144if(y==1){
145a = pow(10, z);
146firstNum  = (firstNum * (float)a + (float)insertNum)/(float)a;
147z++;
148}
149
150
151 if  ( firstNum > max_val){
152  lcd.setCursor(0,0);
153  lcd.print("Num Too Large       ");
154  }
155
156if ( firstNum <= max_val){
157    lcd.print("                   ");
158    lcd.setCursor(0,0);
159lcd.print(firstNum);
160}
161
162}
163
164
165
166if  (insertNum == 10){
167  y++;
168  
169lcd.setCursor(0,1);
170lcd.print("                   ");
171lcd.setCursor(0,1);
172lcd.print("       DECIMAL");
173 
174  if(y == 2){
175    lcd.print("                  ");
176    lcd.setCursor(0,0);
177    lcd.print("error");
178  }
179}
180}
181
182if(NUM  == 1) {
183
184if (insertNum >= 0 && insertNum <= 9){
185
186if(y==0){
187
188
189a  = pow(10, z);
190secondNum = secondNum * (float)a + (float)insertNum;
191}
192
193
194
195if(y==1){
196a  = pow(10, z);
197secondNum = (secondNum * (float)a + (float)insertNum)/(float)a;
198z++;
199}
200
201
202  if ( secondNum > max_val){
203  lcd.setCursor(0,0);
204  lcd.print("Num Too Large       ");
205 }
206
207if ( secondNum <= max_val){
208    lcd.clear();
209    lcd.setCursor(0,0);
210lcd.print(secondNum);
211}
212
213}
214
215
216
217if  (insertNum == 10){
218  y++;
219  
220lcd.setCursor(0,1);
221lcd.print("                   ");
222lcd.setCursor(0,1);
223lcd.print("       DECIMAL");
224 
225  if(y == 2){
226    lcd.print("                  ");
227    lcd.setCursor(0,0);
228    lcd.print("error");
229  }
230}
231
232
233
234}
235
236
237
238
239
240if(insertNum  == 11){
241  NUM = 1;
242lcd.setCursor(0,1);
243lcd.print("              +");
244
245if(  opAS >= 1){
246
247if(OP == 1){
248   if( opAS == 1){
249  total =  (float) firstNum  + (float)secondNum;
250 }
251if (opAS >= 2){
252  total = (float) total + (float)  secondNum;
253}
254}
255if(OP == 2){
256   if( opAS == 1){
257  total =  (float)  firstNum - (float)secondNum;
258 }
259if (opAS >= 2){
260  total = (float) total  - (float) secondNum;
261}
262}
263if(OP == 3){
264   if( opAS == 1){
265  total  =  (float) firstNum * (float)secondNum;
266 }
267if (opAS >= 2){
268  total = (float)  total * (float) secondNum;
269}
270}
271if(OP == 4){
272   if( opAS == 1){
273  total  =  (float) firstNum / (float)secondNum;
274 }
275if (opAS >= 2){
276  total = (float)  total / (float) secondNum;
277}
278}
279  
280lcd.setCursor(0,0);
281lcd.print("                  ");
282lcd.setCursor(0,0);
283lcd.print(total);  
284}
285opAS++;
286secondNum  = 0;
287OP = 1;
288y = 0;
289z=1;
290} 
291
292
293
294
295if(insertNum == 12){
296  NUM = 1;
297lcd.setCursor(0,1);
298lcd.print("              -");
299
300if(  opAS >= 1){
301
302if(OP == 1){
303   if( opAS == 1){
304  total =  (float) firstNum  + (float)secondNum;
305 }
306if (opAS >= 2){
307  total = (float) total + (float)  secondNum;
308}
309}
310if(OP == 2){
311   if( opAS == 1){
312  total =  (float)  firstNum - (float)secondNum;
313 }
314if (opAS >= 2){
315  total = (float) total  - (float) secondNum;
316}
317}
318if(OP == 3){
319   if( opAS == 1){
320  total  =  (float) firstNum * (float)secondNum;
321 }
322if (opAS >= 2){
323  total = (float)  total * (float) secondNum;
324}
325}
326if(OP == 4){
327   if( opAS == 1){
328  total  =  (float) firstNum / (float)secondNum;
329 }
330if (opAS >= 2){
331  total = (float)  total / (float) secondNum;
332}
333}
334  
335lcd.setCursor(0,0);
336lcd.print("                  ");
337lcd.setCursor(0,0);
338lcd.print(total);  
339}
340
341opAS++;
342secondNum  = 0;
343OP=2;
344y = 0;
345z = 1;
346}
347
348/*
349if(insertNum == 13){
350  NUM  = 1;
351lcd.setCursor(0,1);
352lcd.print("              *");
353
354if( opAS >=  1){
355
356if(OP == 1){
357   if( opAS == 1){
358  total =  (float) firstNum + (float)secondNum;
359  }
360if (opAS >= 2){
361  total = (float) total + (float) secondNum;
362}
363}
364if(OP  == 2){
365   if( opAS == 1){
366  total =  (float) firstNum - (float)secondNum;
367  }
368if (opAS >= 2){
369  total = (float) total - (float) secondNum;
370}
371}
372if(OP  == 3){
373   if( opAS == 1){
374  total =  (float) firstNum * (float)secondNum;
375  }
376if (opAS >= 2){
377  total = (float) total * (float) secondNum;
378}
379}
380if(OP  == 4){
381   if( opAS == 1){
382  total =  (float) firstNum / (float)secondNum;
383  }
384if (opAS >= 2){
385  total = (float) total / (float) secondNum;
386}
387}
388  
389lcd.setCursor(0,0);
390lcd.print("                  ");
391lcd.setCursor(0,0);
392lcd.print(total);  
393}
394
395opAS++;
396
397OP=3;
398secondNum = 0;
399}
400*/
401
402if(insertNum  == 13){
403  NUM = 1;
404lcd.setCursor(0,1);
405lcd.print("              *");
406
407if(  opAS > 0){
408
409if(OP == 1){
410   if( opAS == 1){
411  total =  (float) firstNum  + (float)secondNum;
412 }
413if (opAS >= 2){
414  total = (float) total + (float)  secondNum;
415}
416}
417if(OP == 2){
418   if( opAS == 1){
419  total =  (float)  firstNum - (float)secondNum;
420 }
421if (opAS >= 2){
422  total = (float) total  - (float) secondNum;
423}
424}
425if(OP == 3){
426   if( opAS == 1){
427  total  =  (float) firstNum * (float)secondNum;
428 }
429if (opAS >= 2){
430  total = (float)  total * (float) secondNum;
431}
432}
433if(OP == 4){
434   if( opAS == 1){
435  total  =  (float) firstNum / (float)secondNum;
436 }
437if (opAS >= 2){
438  total = (float)  total / (float) secondNum;
439}
440}
441  
442lcd.setCursor(0,0);
443lcd.print("                  ");
444lcd.setCursor(0,0);
445lcd.print(total);  
446}
447
448opAS++;
449secondNum  = 0;
450OP=3;
451y=0;
452z=1;
453}
454
455
456
457
458
459if(insertNum == 14){
460  NUM = 1;
461lcd.setCursor(0,1);
462lcd.print("              /");
463
464if(  opAS >= 1){
465
466if(OP == 1){
467   if( opAS == 1){
468  total =  (float) firstNum  + (float)secondNum;
469 }
470if (opAS >= 2){
471  total = (float) total + (float)  secondNum;
472}
473}
474if(OP == 2){
475   if( opAS == 1){
476  total =  (float)  firstNum - (float)secondNum;
477 }
478if (opAS >= 2){
479  total = (float) total  - (float) secondNum;
480}
481}
482if(OP == 3){
483   if( opAS == 1){
484  total  =  (float) firstNum * (float)secondNum;
485 }
486if (opAS >= 2){
487  total = (float)  total * (float) secondNum;
488}
489}
490if(OP == 4){
491   if( opAS == 1){
492  total  =  (float) firstNum / (float)secondNum;
493 }
494if (opAS >= 2){
495  total = (float)  total / (float) secondNum;
496}
497}
498  
499lcd.setCursor(0,0);
500lcd.print("                  ");
501lcd.setCursor(0,0);
502lcd.print(total);  
503}
504
505opAS++;
506secondNum  = 0;
507OP=4;
508y=0;
509z=1;
510}
511
512
513if(insertNum == 16){
514if(NUM ==  1){
515if(OP == 1){
516   if( opAS == 1){
517  total =  (float) firstNum + (float)secondNum;
518  }
519if (opAS >= 2){
520  total = (float) total + (float) secondNum;
521}
522}
523if(OP  == 2){
524   if( opAS == 1){
525  total =  (float) firstNum - (float)secondNum;
526  }
527if (opAS >= 2){
528  total = (float) total - (float) secondNum;
529}
530}
531if(OP  == 3){
532   if( opAS == 1){
533  total =  (float) firstNum * (float)secondNum;
534  }
535if (opAS >= 2){
536  total = (float) total * (float) secondNum;
537}
538}
539if(OP  == 4){
540   if( opAS == 1){
541  total =  (float) firstNum / (float)secondNum;
542  }
543if (opAS >= 2){
544  total = (float) total / (float) secondNum;
545}
546}
547  
548lcd.clear();
549lcd.setCursor(0,0);
550lcd.print("=");
551lcd.setCursor(1,0);
552lcd.print(total);
553}
554if(NUM  == 0){
555  lcd.clear();
556  lcd.setCursor(0,0);
557  lcd.print(firstNum);
558}
559
560}
561
562
563
564
565if(insertNum  == 15){
566  lcd.clear();
567total = 0;
568
569z = 1;
570y = 0;
571firstNum = 0;    
572secondNum = 0;
573opAS = 0;
574NUM = 0;
575  
576}
577}
578
579
580
581
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585
586
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589  
590
591

#include <LiquidCrystal.h>

LiquidCrystal lcd (8, 9, 10, 11, 12,  13);


#define max_val 999999
float firstNum = 0;
float secondNum  = 0;
float total = 0;
int insertNum;
int z = 1;
int y = 0;
long a;
int  opAS = 0;
int NUM = 0;
int OP;

int one =30;
int two = 32;
int  three = 42;
int four =28;
int five =26;
int six = 46;
int seven = 22;
int  eight =24;
int nine =50;
int zero = 34;     //34
int decimal = 36;
int  addition = 38;
int subtraction = 44;
int multiplication =48;
int division  = 52;
int Clear = 7;
int equal = 40;


void readKey() {

  if  (digitalRead(zero) == HIGH) {
    insertNum = 0;
  }
   else if (digitalRead(one)  == HIGH) {
    insertNum = 1;
  }
  else if (digitalRead(two) == HIGH)  {
    insertNum = 2;
  }
  else if (digitalRead(three) == HIGH) {
    insertNum  = 3;
  }
  else if (digitalRead(four) == HIGH) {
    insertNum = 4;
  }
  else if (digitalRead(five) == HIGH) {
    insertNum = 5;
  }
  else if (digitalRead(six) == HIGH) {
    insertNum = 6;
  }
  else if  (digitalRead(seven) == HIGH) {
    insertNum = 7;
  }
  else if (digitalRead(eight)  == HIGH) {
    insertNum = 8;
  }
  else if (digitalRead(nine) == HIGH)  {
    insertNum = 9;
  }
  else if (digitalRead(decimal) == HIGH) {
    insertNum = 10;
  }
  else if (digitalRead(addition) == HIGH) {
    insertNum  = 11;
  }
  else if (digitalRead(subtraction) == HIGH) {
    insertNum  = 12;
  }
  else if (digitalRead(multiplication) == HIGH) {
    insertNum  = 13;
  }
  else if (digitalRead(division) == HIGH) {
    insertNum = 14;
  }
    else if (digitalRead(Clear) == HIGH) {
    insertNum = 15;
  }
  else if (digitalRead(equal) == HIGH) {
    insertNum = 16;
  }
else{
  insertNum = -1;
}



}







void setup()
{
pinMode(one,  INPUT);
pinMode(two, INPUT);
pinMode(three, INPUT);
pinMode(four,INPUT);
pinMode(five,  INPUT);
pinMode(six, INPUT);
pinMode(seven, INPUT);
pinMode(eight, INPUT);
pinMode(nine,  INPUT);
pinMode(zero, INPUT);
pinMode(decimal, INPUT);
pinMode(addition,  INPUT);
pinMode(subtraction, INPUT);
pinMode(multiplication, INPUT);
pinMode(division,  INPUT);
pinMode(Clear, INPUT);
pinMode(equal, INPUT);

  
lcd.begin(16,2);

}

void  loop(){
readKey();
delay(200);

if(NUM == 0){
if (insertNum >= 0  && insertNum <= 9){
if(y==0){


a = pow(10, z);
firstNum = firstNum  * (float)a + (float)insertNum;
}



if(y==1){
a = pow(10, z);
firstNum  = (firstNum * (float)a + (float)insertNum)/(float)a;
z++;
}


 if  ( firstNum > max_val){
  lcd.setCursor(0,0);
  lcd.print("Num Too Large       ");
  }

if ( firstNum <= max_val){
    lcd.print("                   ");
    lcd.setCursor(0,0);
lcd.print(firstNum);
}

}



if  (insertNum == 10){
  y++;
  
lcd.setCursor(0,1);
lcd.print("                   ");
lcd.setCursor(0,1);
lcd.print("       DECIMAL");
 
  if(y == 2){
    lcd.print("                  ");
    lcd.setCursor(0,0);
    lcd.print("error");
  }
}
}

if(NUM  == 1) {

if (insertNum >= 0 && insertNum <= 9){

if(y==0){


a  = pow(10, z);
secondNum = secondNum * (float)a + (float)insertNum;
}



if(y==1){
a  = pow(10, z);
secondNum = (secondNum * (float)a + (float)insertNum)/(float)a;
z++;
}


  if ( secondNum > max_val){
  lcd.setCursor(0,0);
  lcd.print("Num Too Large       ");
 }

if ( secondNum <= max_val){
    lcd.clear();
    lcd.setCursor(0,0);
lcd.print(secondNum);
}

}



if  (insertNum == 10){
  y++;
  
lcd.setCursor(0,1);
lcd.print("                   ");
lcd.setCursor(0,1);
lcd.print("       DECIMAL");
 
  if(y == 2){
    lcd.print("                  ");
    lcd.setCursor(0,0);
    lcd.print("error");
  }
}



}





if(insertNum  == 11){
  NUM = 1;
lcd.setCursor(0,1);
lcd.print("              +");

if(  opAS >= 1){

if(OP == 1){
   if( opAS == 1){
  total =  (float) firstNum  + (float)secondNum;
 }
if (opAS >= 2){
  total = (float) total + (float)  secondNum;
}
}
if(OP == 2){
   if( opAS == 1){
  total =  (float)  firstNum - (float)secondNum;
 }
if (opAS >= 2){
  total = (float) total  - (float) secondNum;
}
}
if(OP == 3){
   if( opAS == 1){
  total  =  (float) firstNum * (float)secondNum;
 }
if (opAS >= 2){
  total = (float)  total * (float) secondNum;
}
}
if(OP == 4){
   if( opAS == 1){
  total  =  (float) firstNum / (float)secondNum;
 }
if (opAS >= 2){
  total = (float)  total / (float) secondNum;
}
}
  
lcd.setCursor(0,0);
lcd.print("                  ");
lcd.setCursor(0,0);
lcd.print(total);  
}
opAS++;
secondNum  = 0;
OP = 1;
y = 0;
z=1;
} 




if(insertNum == 12){
  NUM = 1;
lcd.setCursor(0,1);
lcd.print("              -");

if(  opAS >= 1){

if(OP == 1){
   if( opAS == 1){
  total =  (float) firstNum  + (float)secondNum;
 }
if (opAS >= 2){
  total = (float) total + (float)  secondNum;
}
}
if(OP == 2){
   if( opAS == 1){
  total =  (float)  firstNum - (float)secondNum;
 }
if (opAS >= 2){
  total = (float) total  - (float) secondNum;
}
}
if(OP == 3){
   if( opAS == 1){
  total  =  (float) firstNum * (float)secondNum;
 }
if (opAS >= 2){
  total = (float)  total * (float) secondNum;
}
}
if(OP == 4){
   if( opAS == 1){
  total  =  (float) firstNum / (float)secondNum;
 }
if (opAS >= 2){
  total = (float)  total / (float) secondNum;
}
}
  
lcd.setCursor(0,0);
lcd.print("                  ");
lcd.setCursor(0,0);
lcd.print(total);  
}

opAS++;
secondNum  = 0;
OP=2;
y = 0;
z = 1;
}

/*
if(insertNum == 13){
  NUM  = 1;
lcd.setCursor(0,1);
lcd.print("              *");

if( opAS >=  1){

if(OP == 1){
   if( opAS == 1){
  total =  (float) firstNum + (float)secondNum;
  }
if (opAS >= 2){
  total = (float) total + (float) secondNum;
}
}
if(OP  == 2){
   if( opAS == 1){
  total =  (float) firstNum - (float)secondNum;
  }
if (opAS >= 2){
  total = (float) total - (float) secondNum;
}
}
if(OP  == 3){
   if( opAS == 1){
  total =  (float) firstNum * (float)secondNum;
  }
if (opAS >= 2){
  total = (float) total * (float) secondNum;
}
}
if(OP  == 4){
   if( opAS == 1){
  total =  (float) firstNum / (float)secondNum;
  }
if (opAS >= 2){
  total = (float) total / (float) secondNum;
}
}
  
lcd.setCursor(0,0);
lcd.print("                  ");
lcd.setCursor(0,0);
lcd.print(total);  
}

opAS++;

OP=3;
secondNum = 0;
}
*/

if(insertNum  == 13){
  NUM = 1;
lcd.setCursor(0,1);
lcd.print("              *");

if(  opAS > 0){

if(OP == 1){
   if( opAS == 1){
  total =  (float) firstNum  + (float)secondNum;
 }
if (opAS >= 2){
  total = (float) total + (float)  secondNum;
}
}
if(OP == 2){
   if( opAS == 1){
  total =  (float)  firstNum - (float)secondNum;
 }
if (opAS >= 2){
  total = (float) total  - (float) secondNum;
}
}
if(OP == 3){
   if( opAS == 1){
  total  =  (float) firstNum * (float)secondNum;
 }
if (opAS >= 2){
  total = (float)  total * (float) secondNum;
}
}
if(OP == 4){
   if( opAS == 1){
  total  =  (float) firstNum / (float)secondNum;
 }
if (opAS >= 2){
  total = (float)  total / (float) secondNum;
}
}
  
lcd.setCursor(0,0);
lcd.print("                  ");
lcd.setCursor(0,0);
lcd.print(total);  
}

opAS++;
secondNum  = 0;
OP=3;
y=0;
z=1;
}





if(insertNum == 14){
  NUM = 1;
lcd.setCursor(0,1);
lcd.print("              /");

if(  opAS >= 1){

if(OP == 1){
   if( opAS == 1){
  total =  (float) firstNum  + (float)secondNum;
 }
if (opAS >= 2){
  total = (float) total + (float)  secondNum;
}
}
if(OP == 2){
   if( opAS == 1){
  total =  (float)  firstNum - (float)secondNum;
 }
if (opAS >= 2){
  total = (float) total  - (float) secondNum;
}
}
if(OP == 3){
   if( opAS == 1){
  total  =  (float) firstNum * (float)secondNum;
 }
if (opAS >= 2){
  total = (float)  total * (float) secondNum;
}
}
if(OP == 4){
   if( opAS == 1){
  total  =  (float) firstNum / (float)secondNum;
 }
if (opAS >= 2){
  total = (float)  total / (float) secondNum;
}
}
  
lcd.setCursor(0,0);
lcd.print("                  ");
lcd.setCursor(0,0);
lcd.print(total);  
}

opAS++;
secondNum  = 0;
OP=4;
y=0;
z=1;
}


if(insertNum == 16){
if(NUM ==  1){
if(OP == 1){
   if( opAS == 1){
  total =  (float) firstNum + (float)secondNum;
  }
if (opAS >= 2){
  total = (float) total + (float) secondNum;
}
}
if(OP  == 2){
   if( opAS == 1){
  total =  (float) firstNum - (float)secondNum;
  }
if (opAS >= 2){
  total = (float) total - (float) secondNum;
}
}
if(OP  == 3){
   if( opAS == 1){
  total =  (float) firstNum * (float)secondNum;
  }
if (opAS >= 2){
  total = (float) total * (float) secondNum;
}
}
if(OP  == 4){
   if( opAS == 1){
  total =  (float) firstNum / (float)secondNum;
  }
if (opAS >= 2){
  total = (float) total / (float) secondNum;
}
}
  
lcd.clear();
lcd.setCursor(0,0);
lcd.print("=");
lcd.setCursor(1,0);
lcd.print(total);
}
if(NUM  == 0){
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(firstNum);
}

}




if(insertNum  == 15){
  lcd.clear();
total = 0;

z = 1;
y = 0;
firstNum = 0;    
secondNum = 0;
opAS = 0;
NUM = 0;
  
}
}

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