Arduino Calculator

1*
2 * Arduino Keypad calculator Program
3 */
4
5#include <LiquidCrystal.h>  //Header file for LCD from https://www.arduino.cc/en/Reference/LiquidCrystal
6#include  <Keypad.h> //Header file for Keypad from https://github.com/Chris--A/Keypad
7
8const  byte ROWS = 4; // Four rows
9const byte COLS = 4; // Three columns
10
11// Define  the Keymap
12char keys[ROWS][COLS] = {
13
14  {'7','8','9','D'},
15
16  {'4','5','6','C'},
17
18  {'1','2','3','B'},
19
20  {'*','0','#','A'}
21
22};
23
24byte rowPins[ROWS]  = { 0, 1, 2, 3 };// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
25byte  colPins[COLS] = { 4, 5, 6, 7 }; // Connect keypad COL0, COL1 and COL2 to these Arduino  pins.
26
27Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS  ); //  Create the Keypad
28
29const int rs = 8, en = 9, d4 = 10, d5 = 11, d6 =  12, d7 = 13; //Pins to which LCD is connected
30LiquidCrystal lcd(rs, en, d4, d5,  d6, d7);
31
32 long Num1,Num2,Number;
33 char key,action;
34 boolean result  = false;
35 
36void setup() {
37  lcd.begin(16, 2); //We are using a 16*2 LCD  display
38  lcd.print("DIY Calculator"); //Display a intro message
39  lcd.setCursor(0,  1);   // set the cursor to column 0, line 1
40  lcd.print("-CircuitDigest");  //Display a intro message 
41
42   delay(2000); //Wait for display to show info
43    lcd.clear(); //Then clean it
44}
45
46void loop() {
47  
48key = kpd.getKey();  //storing pressed key value in a char
49
50if (key!=NO_KEY)
51DetectButtons();
52
53if  (result==true)
54CalculateResult();
55
56DisplayResult();   
57}
58
59void  DetectButtons()
60{ 
61     lcd.clear(); //Then clean it
62    if (key=='*')  //If cancel Button is pressed
63    {Serial.println ("Button Cancel"); Number=Num1=Num2=0;  result=false;}
64    
65     if (key == '1') //If Button 1 is pressed
66    {Serial.println  ("Button 1"); 
67    if (Number==0)
68    Number=1;
69    else
70    Number  = (Number*10) + 1; //Pressed twice
71    }
72    
73     if (key == '4') //If  Button 4 is pressed
74    {Serial.println ("Button 4"); 
75    if (Number==0)
76    Number=4;
77    else
78    Number = (Number*10) + 4; //Pressed twice
79    }
80    
81     if (key == '7') //If Button 7 is pressed
82    {Serial.println ("Button  7");
83    if (Number==0)
84    Number=7;
85    else
86    Number = (Number*10)  + 7; //Pressed twice
87    } 
88  
89
90    if (key == '0')
91    {Serial.println  ("Button 0"); //Button 0 is Pressed
92    if (Number==0)
93    Number=0;
94    else
95    Number = (Number*10) + 0; //Pressed twice
96    }
97    
98     if  (key == '2') //Button 2 is Pressed
99    {Serial.println ("Button 2"); 
100     if  (Number==0)
101    Number=2;
102    else
103    Number = (Number*10) + 2; //Pressed  twice
104    }
105    
106     if (key == '5')
107    {Serial.println ("Button  5"); 
108     if (Number==0)
109    Number=5;
110    else
111    Number = (Number*10)  + 5; //Pressed twice
112    }
113    
114     if (key == '8')
115    {Serial.println  ("Button 8"); 
116     if (Number==0)
117    Number=8;
118    else
119    Number  = (Number*10) + 8; //Pressed twice
120    }   
121  
122
123    if (key == '#')
124    {Serial.println ("Button Equal"); 
125    Num2=Number;
126    result = true;
127    }
128    
129     if (key == '3')
130    {Serial.println ("Button 3"); 
131     if (Number==0)
132    Number=3;
133    else
134    Number = (Number*10) + 3;  //Pressed twice
135    }
136    
137     if (key == '6')
138    {Serial.println  ("Button 6"); 
139    if (Number==0)
140    Number=6;
141    else
142    Number  = (Number*10) + 6; //Pressed twice
143    }
144    
145     if (key == '9')
146    {Serial.println ("Button 9");
147    if (Number==0)
148    Number=9;
149    else
150    Number = (Number*10) + 9; //Pressed twice
151    }  
152
153      if (key ==  'A' || key == 'B' || key == 'C' || key == 'D') //Detecting Buttons on Column 4
154  {
155    Num1 = Number;    
156    Number =0;
157    if (key == 'A')
158    {Serial.println  ("Addition"); action = '+';}
159     if (key == 'B')
160    {Serial.println ("Subtraction");  action = '-'; }
161     if (key == 'C')
162    {Serial.println ("Multiplication");  action = '*';}
163     if (key == 'D')
164    {Serial.println ("Devesion"); action  = '/';}  
165
166    delay(100);
167  }
168  
169}
170
171void CalculateResult()
172{
173  if (action=='+')
174    Number = Num1+Num2;
175
176  if (action=='-')
177    Number  = Num1-Num2;
178
179  if (action=='*')
180    Number = Num1*Num2;
181
182  if (action=='/')
183    Number = Num1/Num2; 
184}
185
186void DisplayResult()
187{
188  lcd.setCursor(0,  0);   // set the cursor to column 0, line 1
189  lcd.print(Num1); lcd.print(action);  lcd.print(Num2); 
190  
191  if (result==true)
192  {lcd.print(" ="); lcd.print(Number);}  //Display the result
193  
194  lcd.setCursor(0, 1);   // set the cursor to column  0, line 1
195  lcd.print(Number); //Display the result
196}
197

1*
2 * Arduino Keypad calculator Program
3 */
4
5#include <LiquidCrystal.h>
6  //Header file for LCD from https://www.arduino.cc/en/Reference/LiquidCrystal
7#include
8  <Keypad.h> //Header file for Keypad from https://github.com/Chris--A/Keypad
9
10const
11  byte ROWS = 4; // Four rows
12const byte COLS = 4; // Three columns
13
14// Define
15  the Keymap
16char keys[ROWS][COLS] = {
17
18  {'7','8','9','D'},
19
20  {'4','5','6','C'},
21
22
23  {'1','2','3','B'},
24
25  {'*','0','#','A'}
26
27};
28
29byte rowPins[ROWS]
30  = { 0, 1, 2, 3 };// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
31byte
32  colPins[COLS] = { 4, 5, 6, 7 }; // Connect keypad COL0, COL1 and COL2 to these Arduino
33  pins.
34
35Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS
36  ); //  Create the Keypad
37
38const int rs = 8, en = 9, d4 = 10, d5 = 11, d6 =
39  12, d7 = 13; //Pins to which LCD is connected
40LiquidCrystal lcd(rs, en, d4, d5,
41  d6, d7);
42
43 long Num1,Num2,Number;
44 char key,action;
45 boolean result
46  = false;
47 
48void setup() {
49  lcd.begin(16, 2); //We are using a 16*2 LCD
50  display
51  lcd.print("DIY Calculator"); //Display a intro message
52  lcd.setCursor(0,
53  1);   // set the cursor to column 0, line 1
54  lcd.print("-CircuitDigest");
55  //Display a intro message 
56
57   delay(2000); //Wait for display to show info
58
59    lcd.clear(); //Then clean it
60}
61
62void loop() {
63  
64key = kpd.getKey();
65  //storing pressed key value in a char
66
67if (key!=NO_KEY)
68DetectButtons();
69
70if
71  (result==true)
72CalculateResult();
73
74DisplayResult();   
75}
76
77void
78  DetectButtons()
79{ 
80     lcd.clear(); //Then clean it
81    if (key=='*')
82  //If cancel Button is pressed
83    {Serial.println ("Button Cancel"); Number=Num1=Num2=0;
84  result=false;}
85    
86     if (key == '1') //If Button 1 is pressed
87    {Serial.println
88  ("Button 1"); 
89    if (Number==0)
90    Number=1;
91    else
92    Number
93  = (Number*10) + 1; //Pressed twice
94    }
95    
96     if (key == '4') //If
97  Button 4 is pressed
98    {Serial.println ("Button 4"); 
99    if (Number==0)
100
101    Number=4;
102    else
103    Number = (Number*10) + 4; //Pressed twice
104    }
105
106    
107     if (key == '7') //If Button 7 is pressed
108    {Serial.println ("Button
109  7");
110    if (Number==0)
111    Number=7;
112    else
113    Number = (Number*10)
114  + 7; //Pressed twice
115    } 
116  
117
118    if (key == '0')
119    {Serial.println
120  ("Button 0"); //Button 0 is Pressed
121    if (Number==0)
122    Number=0;
123
124    else
125    Number = (Number*10) + 0; //Pressed twice
126    }
127    
128     if
129  (key == '2') //Button 2 is Pressed
130    {Serial.println ("Button 2"); 
131     if
132  (Number==0)
133    Number=2;
134    else
135    Number = (Number*10) + 2; //Pressed
136  twice
137    }
138    
139     if (key == '5')
140    {Serial.println ("Button
141  5"); 
142     if (Number==0)
143    Number=5;
144    else
145    Number = (Number*10)
146  + 5; //Pressed twice
147    }
148    
149     if (key == '8')
150    {Serial.println
151  ("Button 8"); 
152     if (Number==0)
153    Number=8;
154    else
155    Number
156  = (Number*10) + 8; //Pressed twice
157    }   
158  
159
160    if (key == '#')
161
162    {Serial.println ("Button Equal"); 
163    Num2=Number;
164    result = true;
165
166    }
167    
168     if (key == '3')
169    {Serial.println ("Button 3"); 
170
171     if (Number==0)
172    Number=3;
173    else
174    Number = (Number*10) + 3;
175  //Pressed twice
176    }
177    
178     if (key == '6')
179    {Serial.println
180  ("Button 6"); 
181    if (Number==0)
182    Number=6;
183    else
184    Number
185  = (Number*10) + 6; //Pressed twice
186    }
187    
188     if (key == '9')
189
190    {Serial.println ("Button 9");
191    if (Number==0)
192    Number=9;
193    else
194
195    Number = (Number*10) + 9; //Pressed twice
196    }  
197
198      if (key ==
199  'A' || key == 'B' || key == 'C' || key == 'D') //Detecting Buttons on Column 4
200
201  {
202    Num1 = Number;    
203    Number =0;
204    if (key == 'A')
205    {Serial.println
206  ("Addition"); action = '+';}
207     if (key == 'B')
208    {Serial.println ("Subtraction");
209  action = '-'; }
210     if (key == 'C')
211    {Serial.println ("Multiplication");
212  action = '*';}
213     if (key == 'D')
214    {Serial.println ("Devesion"); action
215  = '/';}  
216
217    delay(100);
218  }
219  
220}
221
222void CalculateResult()
223{
224
225  if (action=='+')
226    Number = Num1+Num2;
227
228  if (action=='-')
229    Number
230  = Num1-Num2;
231
232  if (action=='*')
233    Number = Num1*Num2;
234
235  if (action=='/')
236
237    Number = Num1/Num2; 
238}
239
240void DisplayResult()
241{
242  lcd.setCursor(0,
243  0);   // set the cursor to column 0, line 1
244  lcd.print(Num1); lcd.print(action);
245  lcd.print(Num2); 
246  
247  if (result==true)
248  {lcd.print(" ="); lcd.print(Number);}
249  //Display the result
250  
251  lcd.setCursor(0, 1);   // set the cursor to column
252  0, line 1
253  lcd.print(Number); //Display the result
254}
255