LED Bar Graph and Keypad

Display the key pressed from the keypad on the LED bar graph in binary.

May 1, 2019

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keypad

control

led bar graph

Apps and platforms

Arduino IDE

Project description

Code

LED Bar Graph and 16-key Keypad

arduino

1//Take input from a keypad and display the binary number of the key pressed
2  on the LED bar graph
3
4//variable declarations
5int button1 = 0;
6int button2
7  = 0;
8int button3 = 0;
9int buttonA = 0;
10int button4 = 0;
11int button5
12  = 0;
13int button6 = 0;
14int buttonB = 0;
15int button7 = 0;
16int button8
17  = 0;
18int button9 = 0;
19int buttonC = 0;
20int buttonAst = 0;
21int button0
22  = 0;
23int buttonHash = 0;
24int buttonD = 0;
25
26
27void setup() {
28  //
29  put your setup code here, to run once:
30  //set pins 0-3 as output and 4-7 as
31  input
32  DDRD = B00001111;
33
34  //set pins 8-11 as output
35  pinMode(8,
36  OUTPUT);
37  pinMode(9, OUTPUT);
38  pinMode(10, OUTPUT);
39  pinMode(11, OUTPUT);
40
41}
42
43void
44  loop() {
45  // put your main code here, to run repeatedly:
46
47  digitalWrite(0,
48  HIGH);   //set pin 0 high
49  //check if input pins go high (button pressed)
50
51  button1 = digitalRead(4);
52  button4 = digitalRead(5);
53  button7 = digitalRead(6);
54
55  buttonAst = digitalRead(7);
56  digitalWrite(0, LOW);    //set pin 0 low
57
58  
59  if(button1 == 1){
60    delay(100);   //wait until switch settles
61    
62
63    //set LEDs to 0001
64    digitalWrite(8, HIGH);
65    digitalWrite(9, LOW);
66
67    digitalWrite(10, LOW);
68    digitalWrite(11, LOW);
69  }
70
71  if(button4
72  == 1){
73    delay(100);   //wait until switch settles
74
75    //set LEDs to
76  0100
77    digitalWrite(8, LOW);
78    digitalWrite(9, LOW);
79    digitalWrite(10,
80  HIGH);
81    digitalWrite(11, LOW);
82  }
83
84  if(button7 == 1){
85    delay(100);
86   //wait until switch settles
87
88    //set LEDs to 0111
89    digitalWrite(8,
90  HIGH);
91    digitalWrite(9, HIGH);
92    digitalWrite(10, HIGH);
93    digitalWrite(11,
94  LOW);
95  }
96
97  if(buttonAst == 1){
98    delay(100);   //wait until switch
99  settles
100
101    //set LEDs to 1110
102    digitalWrite(8, HIGH);
103    digitalWrite(9,
104  HIGH);
105    digitalWrite(10, HIGH);
106    digitalWrite(11, LOW);
107  }
108
109
110  digitalWrite(1, HIGH);   //set pin 1 high
111  //check if input pins go high (button
112  pressed)
113  button2 = digitalRead(4);
114  button5 = digitalRead(5);
115  button8
116  = digitalRead(6);
117  button0 = digitalRead(7);
118  digitalWrite(1, LOW);    //set
119  pin 1 low
120  
121  if(button2 == 1){
122    delay(100);   //wait until switch
123  settles
124    
125    //set LEDs to 0010
126    digitalWrite(8, LOW);
127    digitalWrite(9,
128  HIGH);
129    digitalWrite(10, LOW);
130    digitalWrite(11, LOW);
131  }
132
133
134  if(button5 == 1){
135    delay(100);   //wait until switch settles
136
137    //set
138  LEDs to 0101
139    digitalWrite(8, HIGH);
140    digitalWrite(9, LOW);
141    digitalWrite(10,
142  HIGH);
143    digitalWrite(11, LOW);
144  }
145
146  if(button8 == 1){
147    delay(100);
148   //wait until switch settles
149
150    //set LEDs to 1000
151    digitalWrite(8,
152  LOW);
153    digitalWrite(9, LOW);
154    digitalWrite(10, LOW);
155    digitalWrite(11,
156  HIGH);
157  }
158
159  if(button0 == 1){
160    delay(100);   //wait until switch
161  settles
162    
163    //set LEDs to 0000
164    digitalWrite(8, LOW);
165    digitalWrite(9,
166  LOW);
167    digitalWrite(10, LOW);
168    digitalWrite(11, LOW);
169  }
170
171
172  digitalWrite(2, HIGH);   //set pin 2 high
173  //check if input pins go high (button
174  pressed)
175  button3 = digitalRead(4);
176  button6 = digitalRead(5);
177  button9
178  = digitalRead(6);
179  buttonHash = digitalRead(7);
180  digitalWrite(2, LOW);    //set
181  pin 2 low
182  
183  if(button3 == 1){
184    delay(100);   //wait until switch
185  settles
186    
187    //set LEDs to 0011
188    digitalWrite(8, HIGH);
189    digitalWrite(9,
190  HIGH);
191    digitalWrite(10, LOW);
192    digitalWrite(11, LOW);
193  }
194
195
196  if(button6 == 1){
197    delay(100);   //wait until switch settles
198    
199
200    //set LEDs to 0110
201    digitalWrite(8, LOW);
202    digitalWrite(9, HIGH);
203
204    digitalWrite(10, HIGH);
205    digitalWrite(11, LOW);
206  }
207
208  if(button9
209  == 1){
210    delay(100);   //wait until switch settles
211
212    //set LEDs to
213  1001
214    digitalWrite(8, HIGH);
215    digitalWrite(9, LOW);
216    digitalWrite(10,
217  LOW);
218    digitalWrite(11, HIGH);
219  }
220
221  if(buttonHash == 1){
222    delay(100);
223   //wait until switch settles
224
225    //set LEDs to 1111
226    digitalWrite(8,
227  HIGH);
228    digitalWrite(9, HIGH);
229    digitalWrite(10, HIGH);
230    digitalWrite(11,
231  HIGH);
232  }
233
234  digitalWrite(3, HIGH);   //set pin 3 high
235  //check if
236  input pins go high (button pressed)
237  buttonA = digitalRead(4);
238  buttonB
239  = digitalRead(5);
240  buttonC = digitalRead(6);
241  buttonD = digitalRead(7);
242
243  digitalWrite(3, LOW);    //set pin 3 low
244  
245  if(buttonA == 1){
246    delay(100);
247   //wait until switch settles
248
249    //set LEDs to 1010
250    digitalWrite(8,
251  LOW);
252    digitalWrite(9, HIGH);
253    digitalWrite(10, LOW);
254    digitalWrite(11,
255  HIGH);
256  }
257
258  if(buttonB == 1){
259    delay(100);   //wait until switch
260  settles
261
262    //set LEDs to 1011
263    digitalWrite(8, HIGH);
264    digitalWrite(9,
265  HIGH);
266    digitalWrite(10, LOW);
267    digitalWrite(11, HIGH);
268  }
269
270
271  if(buttonC == 1){
272    delay(100);   //wait until switch settles
273
274    //set
275  LEDs to 1100
276    digitalWrite(8, LOW);
277    digitalWrite(9, LOW);
278    digitalWrite(10,
279  HIGH);
280    digitalWrite(11, HIGH);
281  }
282
283  if(buttonD == 1){
284    delay(100);
285   //wait until switch settles
286
287    //set LEDs to 1101
288    digitalWrite(8,
289  HIGH);
290    digitalWrite(9, LOW);
291    digitalWrite(10, HIGH);
292    digitalWrite(11,
293  HIGH);
294  }
295
296}

//Take input from a keypad and display the binary number of the key pressed
  on the LED bar graph

//variable declarations
int button1 = 0;
int button2
  = 0;
int button3 = 0;
int buttonA = 0;
int button4 = 0;
int button5
  = 0;
int button6 = 0;
int buttonB = 0;
int button7 = 0;
int button8
  = 0;
int button9 = 0;
int buttonC = 0;
int buttonAst = 0;
int button0
  = 0;
int buttonHash = 0;
int buttonD = 0;


void setup() {
  //
  put your setup code here, to run once:
  //set pins 0-3 as output and 4-7 as
  input
  DDRD = B00001111;

  //set pins 8-11 as output
  pinMode(8,
  OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);

}

void
  loop() {
  // put your main code here, to run repeatedly:

  digitalWrite(0,
  HIGH);   //set pin 0 high
  //check if input pins go high (button pressed)

  button1 = digitalRead(4);
  button4 = digitalRead(5);
  button7 = digitalRead(6);

  buttonAst = digitalRead(7);
  digitalWrite(0, LOW);    //set pin 0 low

  
  if(button1 == 1){
    delay(100);   //wait until switch settles
    

    //set LEDs to 0001
    digitalWrite(8, HIGH);
    digitalWrite(9, LOW);

    digitalWrite(10, LOW);
    digitalWrite(11, LOW);
  }

  if(button4
  == 1){
    delay(100);   //wait until switch settles

    //set LEDs to
  0100
    digitalWrite(8, LOW);
    digitalWrite(9, LOW);
    digitalWrite(10,
  HIGH);
    digitalWrite(11, LOW);
  }

  if(button7 == 1){
    delay(100);
   //wait until switch settles

    //set LEDs to 0111
    digitalWrite(8,
  HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(11,
  LOW);
  }

  if(buttonAst == 1){
    delay(100);   //wait until switch
  settles

    //set LEDs to 1110
    digitalWrite(8, HIGH);
    digitalWrite(9,
  HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(11, LOW);
  }


  digitalWrite(1, HIGH);   //set pin 1 high
  //check if input pins go high (button
  pressed)
  button2 = digitalRead(4);
  button5 = digitalRead(5);
  button8
  = digitalRead(6);
  button0 = digitalRead(7);
  digitalWrite(1, LOW);    //set
  pin 1 low
  
  if(button2 == 1){
    delay(100);   //wait until switch
  settles
    
    //set LEDs to 0010
    digitalWrite(8, LOW);
    digitalWrite(9,
  HIGH);
    digitalWrite(10, LOW);
    digitalWrite(11, LOW);
  }


  if(button5 == 1){
    delay(100);   //wait until switch settles

    //set
  LEDs to 0101
    digitalWrite(8, HIGH);
    digitalWrite(9, LOW);
    digitalWrite(10,
  HIGH);
    digitalWrite(11, LOW);
  }

  if(button8 == 1){
    delay(100);
   //wait until switch settles

    //set LEDs to 1000
    digitalWrite(8,
  LOW);
    digitalWrite(9, LOW);
    digitalWrite(10, LOW);
    digitalWrite(11,
  HIGH);
  }

  if(button0 == 1){
    delay(100);   //wait until switch
  settles
    
    //set LEDs to 0000
    digitalWrite(8, LOW);
    digitalWrite(9,
  LOW);
    digitalWrite(10, LOW);
    digitalWrite(11, LOW);
  }


  digitalWrite(2, HIGH);   //set pin 2 high
  //check if input pins go high (button
  pressed)
  button3 = digitalRead(4);
  button6 = digitalRead(5);
  button9
  = digitalRead(6);
  buttonHash = digitalRead(7);
  digitalWrite(2, LOW);    //set
  pin 2 low
  
  if(button3 == 1){
    delay(100);   //wait until switch
  settles
    
    //set LEDs to 0011
    digitalWrite(8, HIGH);
    digitalWrite(9,
  HIGH);
    digitalWrite(10, LOW);
    digitalWrite(11, LOW);
  }


  if(button6 == 1){
    delay(100);   //wait until switch settles
    

    //set LEDs to 0110
    digitalWrite(8, LOW);
    digitalWrite(9, HIGH);

    digitalWrite(10, HIGH);
    digitalWrite(11, LOW);
  }

  if(button9
  == 1){
    delay(100);   //wait until switch settles

    //set LEDs to
  1001
    digitalWrite(8, HIGH);
    digitalWrite(9, LOW);
    digitalWrite(10,
  LOW);
    digitalWrite(11, HIGH);
  }

  if(buttonHash == 1){
    delay(100);
   //wait until switch settles

    //set LEDs to 1111
    digitalWrite(8,
  HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(11,
  HIGH);
  }

  digitalWrite(3, HIGH);   //set pin 3 high
  //check if
  input pins go high (button pressed)
  buttonA = digitalRead(4);
  buttonB
  = digitalRead(5);
  buttonC = digitalRead(6);
  buttonD = digitalRead(7);

  digitalWrite(3, LOW);    //set pin 3 low
  
  if(buttonA == 1){
    delay(100);
   //wait until switch settles

    //set LEDs to 1010
    digitalWrite(8,
  LOW);
    digitalWrite(9, HIGH);
    digitalWrite(10, LOW);
    digitalWrite(11,
  HIGH);
  }

  if(buttonB == 1){
    delay(100);   //wait until switch
  settles

    //set LEDs to 1011
    digitalWrite(8, HIGH);
    digitalWrite(9,
  HIGH);
    digitalWrite(10, LOW);
    digitalWrite(11, HIGH);
  }


  if(buttonC == 1){
    delay(100);   //wait until switch settles

    //set
  LEDs to 1100
    digitalWrite(8, LOW);
    digitalWrite(9, LOW);
    digitalWrite(10,
  HIGH);
    digitalWrite(11, HIGH);
  }

  if(buttonD == 1){
    delay(100);
   //wait until switch settles

    //set LEDs to 1101
    digitalWrite(8,
  HIGH);
    digitalWrite(9, LOW);
    digitalWrite(10, HIGH);
    digitalWrite(11,
  HIGH);
  }

}

LED Bar Graph and 16-key Keypad

arduino

1//Take input from a keypad and display the binary number of the key pressed  on the LED bar graph
2
3//variable declarations
4int button1 = 0;
5int button2  = 0;
6int button3 = 0;
7int buttonA = 0;
8int button4 = 0;
9int button5  = 0;
10int button6 = 0;
11int buttonB = 0;
12int button7 = 0;
13int button8  = 0;
14int button9 = 0;
15int buttonC = 0;
16int buttonAst = 0;
17int button0  = 0;
18int buttonHash = 0;
19int buttonD = 0;
20
21
22void setup() {
23  //  put your setup code here, to run once:
24  //set pins 0-3 as output and 4-7 as  input
25  DDRD = B00001111;
26
27  //set pins 8-11 as output
28  pinMode(8,  OUTPUT);
29  pinMode(9, OUTPUT);
30  pinMode(10, OUTPUT);
31  pinMode(11, OUTPUT);
32
33}
34
35void  loop() {
36  // put your main code here, to run repeatedly:
37
38  digitalWrite(0,  HIGH);   //set pin 0 high
39  //check if input pins go high (button pressed)
40  button1 = digitalRead(4);
41  button4 = digitalRead(5);
42  button7 = digitalRead(6);
43  buttonAst = digitalRead(7);
44  digitalWrite(0, LOW);    //set pin 0 low
45  
46  if(button1 == 1){
47    delay(100);   //wait until switch settles
48    
49    //set LEDs to 0001
50    digitalWrite(8, HIGH);
51    digitalWrite(9, LOW);
52    digitalWrite(10, LOW);
53    digitalWrite(11, LOW);
54  }
55
56  if(button4  == 1){
57    delay(100);   //wait until switch settles
58
59    //set LEDs to  0100
60    digitalWrite(8, LOW);
61    digitalWrite(9, LOW);
62    digitalWrite(10,  HIGH);
63    digitalWrite(11, LOW);
64  }
65
66  if(button7 == 1){
67    delay(100);   //wait until switch settles
68
69    //set LEDs to 0111
70    digitalWrite(8,  HIGH);
71    digitalWrite(9, HIGH);
72    digitalWrite(10, HIGH);
73    digitalWrite(11,  LOW);
74  }
75
76  if(buttonAst == 1){
77    delay(100);   //wait until switch  settles
78
79    //set LEDs to 1110
80    digitalWrite(8, HIGH);
81    digitalWrite(9,  HIGH);
82    digitalWrite(10, HIGH);
83    digitalWrite(11, LOW);
84  }
85
86  digitalWrite(1, HIGH);   //set pin 1 high
87  //check if input pins go high (button  pressed)
88  button2 = digitalRead(4);
89  button5 = digitalRead(5);
90  button8  = digitalRead(6);
91  button0 = digitalRead(7);
92  digitalWrite(1, LOW);    //set  pin 1 low
93  
94  if(button2 == 1){
95    delay(100);   //wait until switch  settles
96    
97    //set LEDs to 0010
98    digitalWrite(8, LOW);
99    digitalWrite(9,  HIGH);
100    digitalWrite(10, LOW);
101    digitalWrite(11, LOW);
102  }
103
104  if(button5 == 1){
105    delay(100);   //wait until switch settles
106
107    //set  LEDs to 0101
108    digitalWrite(8, HIGH);
109    digitalWrite(9, LOW);
110    digitalWrite(10,  HIGH);
111    digitalWrite(11, LOW);
112  }
113
114  if(button8 == 1){
115    delay(100);   //wait until switch settles
116
117    //set LEDs to 1000
118    digitalWrite(8,  LOW);
119    digitalWrite(9, LOW);
120    digitalWrite(10, LOW);
121    digitalWrite(11,  HIGH);
122  }
123
124  if(button0 == 1){
125    delay(100);   //wait until switch  settles
126    
127    //set LEDs to 0000
128    digitalWrite(8, LOW);
129    digitalWrite(9,  LOW);
130    digitalWrite(10, LOW);
131    digitalWrite(11, LOW);
132  }
133
134  digitalWrite(2, HIGH);   //set pin 2 high
135  //check if input pins go high (button  pressed)
136  button3 = digitalRead(4);
137  button6 = digitalRead(5);
138  button9  = digitalRead(6);
139  buttonHash = digitalRead(7);
140  digitalWrite(2, LOW);    //set  pin 2 low
141  
142  if(button3 == 1){
143    delay(100);   //wait until switch  settles
144    
145    //set LEDs to 0011
146    digitalWrite(8, HIGH);
147    digitalWrite(9,  HIGH);
148    digitalWrite(10, LOW);
149    digitalWrite(11, LOW);
150  }
151
152  if(button6 == 1){
153    delay(100);   //wait until switch settles
154    
155    //set LEDs to 0110
156    digitalWrite(8, LOW);
157    digitalWrite(9, HIGH);
158    digitalWrite(10, HIGH);
159    digitalWrite(11, LOW);
160  }
161
162  if(button9  == 1){
163    delay(100);   //wait until switch settles
164
165    //set LEDs to  1001
166    digitalWrite(8, HIGH);
167    digitalWrite(9, LOW);
168    digitalWrite(10,  LOW);
169    digitalWrite(11, HIGH);
170  }
171
172  if(buttonHash == 1){
173    delay(100);   //wait until switch settles
174
175    //set LEDs to 1111
176    digitalWrite(8,  HIGH);
177    digitalWrite(9, HIGH);
178    digitalWrite(10, HIGH);
179    digitalWrite(11,  HIGH);
180  }
181
182  digitalWrite(3, HIGH);   //set pin 3 high
183  //check if  input pins go high (button pressed)
184  buttonA = digitalRead(4);
185  buttonB  = digitalRead(5);
186  buttonC = digitalRead(6);
187  buttonD = digitalRead(7);
188  digitalWrite(3, LOW);    //set pin 3 low
189  
190  if(buttonA == 1){
191    delay(100);   //wait until switch settles
192
193    //set LEDs to 1010
194    digitalWrite(8,  LOW);
195    digitalWrite(9, HIGH);
196    digitalWrite(10, LOW);
197    digitalWrite(11,  HIGH);
198  }
199
200  if(buttonB == 1){
201    delay(100);   //wait until switch  settles
202
203    //set LEDs to 1011
204    digitalWrite(8, HIGH);
205    digitalWrite(9,  HIGH);
206    digitalWrite(10, LOW);
207    digitalWrite(11, HIGH);
208  }
209
210  if(buttonC == 1){
211    delay(100);   //wait until switch settles
212
213    //set  LEDs to 1100
214    digitalWrite(8, LOW);
215    digitalWrite(9, LOW);
216    digitalWrite(10,  HIGH);
217    digitalWrite(11, HIGH);
218  }
219
220  if(buttonD == 1){
221    delay(100);   //wait until switch settles
222
223    //set LEDs to 1101
224    digitalWrite(8,  HIGH);
225    digitalWrite(9, LOW);
226    digitalWrite(10, HIGH);
227    digitalWrite(11,  HIGH);
228  }
229
230}

//Take input from a keypad and display the binary number of the key pressed  on the LED bar graph

//variable declarations
int button1 = 0;
int button2  = 0;
int button3 = 0;
int buttonA = 0;
int button4 = 0;
int button5  = 0;
int button6 = 0;
int buttonB = 0;
int button7 = 0;
int button8  = 0;
int button9 = 0;
int buttonC = 0;
int buttonAst = 0;
int button0  = 0;
int buttonHash = 0;
int buttonD = 0;


void setup() {
  //  put your setup code here, to run once:
  //set pins 0-3 as output and 4-7 as  input
  DDRD = B00001111;

  //set pins 8-11 as output
  pinMode(8,  OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);

}

void  loop() {
  // put your main code here, to run repeatedly:

  digitalWrite(0,  HIGH);   //set pin 0 high
  //check if input pins go high (button pressed)
  button1 = digitalRead(4);
  button4 = digitalRead(5);
  button7 = digitalRead(6);
  buttonAst = digitalRead(7);
  digitalWrite(0, LOW);    //set pin 0 low
  
  if(button1 == 1){
    delay(100);   //wait until switch settles
    
    //set LEDs to 0001
    digitalWrite(8, HIGH);
    digitalWrite(9, LOW);
    digitalWrite(10, LOW);
    digitalWrite(11, LOW);
  }

  if(button4  == 1){
    delay(100);   //wait until switch settles

    //set LEDs to  0100
    digitalWrite(8, LOW);
    digitalWrite(9, LOW);
    digitalWrite(10,  HIGH);
    digitalWrite(11, LOW);
  }

  if(button7 == 1){
    delay(100);   //wait until switch settles

    //set LEDs to 0111
    digitalWrite(8,  HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(11,  LOW);
  }

  if(buttonAst == 1){
    delay(100);   //wait until switch  settles

    //set LEDs to 1110
    digitalWrite(8, HIGH);
    digitalWrite(9,  HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(11, LOW);
  }

  digitalWrite(1, HIGH);   //set pin 1 high
  //check if input pins go high (button  pressed)
  button2 = digitalRead(4);
  button5 = digitalRead(5);
  button8  = digitalRead(6);
  button0 = digitalRead(7);
  digitalWrite(1, LOW);    //set  pin 1 low
  
  if(button2 == 1){
    delay(100);   //wait until switch  settles
    
    //set LEDs to 0010
    digitalWrite(8, LOW);
    digitalWrite(9,  HIGH);
    digitalWrite(10, LOW);
    digitalWrite(11, LOW);
  }

  if(button5 == 1){
    delay(100);   //wait until switch settles

    //set  LEDs to 0101
    digitalWrite(8, HIGH);
    digitalWrite(9, LOW);
    digitalWrite(10,  HIGH);
    digitalWrite(11, LOW);
  }

  if(button8 == 1){
    delay(100);   //wait until switch settles

    //set LEDs to 1000
    digitalWrite(8,  LOW);
    digitalWrite(9, LOW);
    digitalWrite(10, LOW);
    digitalWrite(11,  HIGH);
  }

  if(button0 == 1){
    delay(100);   //wait until switch  settles
    
    //set LEDs to 0000
    digitalWrite(8, LOW);
    digitalWrite(9,  LOW);
    digitalWrite(10, LOW);
    digitalWrite(11, LOW);
  }

  digitalWrite(2, HIGH);   //set pin 2 high
  //check if input pins go high (button  pressed)
  button3 = digitalRead(4);
  button6 = digitalRead(5);
  button9  = digitalRead(6);
  buttonHash = digitalRead(7);
  digitalWrite(2, LOW);    //set  pin 2 low
  
  if(button3 == 1){
    delay(100);   //wait until switch  settles
    
    //set LEDs to 0011
    digitalWrite(8, HIGH);
    digitalWrite(9,  HIGH);
    digitalWrite(10, LOW);
    digitalWrite(11, LOW);
  }

  if(button6 == 1){
    delay(100);   //wait until switch settles
    
    //set LEDs to 0110
    digitalWrite(8, LOW);
    digitalWrite(9, HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(11, LOW);
  }

  if(button9  == 1){
    delay(100);   //wait until switch settles

    //set LEDs to  1001
    digitalWrite(8, HIGH);
    digitalWrite(9, LOW);
    digitalWrite(10,  LOW);
    digitalWrite(11, HIGH);
  }

  if(buttonHash == 1){
    delay(100);   //wait until switch settles

    //set LEDs to 1111
    digitalWrite(8,  HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(11,  HIGH);
  }

  digitalWrite(3, HIGH);   //set pin 3 high
  //check if  input pins go high (button pressed)
  buttonA = digitalRead(4);
  buttonB  = digitalRead(5);
  buttonC = digitalRead(6);
  buttonD = digitalRead(7);
  digitalWrite(3, LOW);    //set pin 3 low
  
  if(buttonA == 1){
    delay(100);   //wait until switch settles

    //set LEDs to 1010
    digitalWrite(8,  LOW);
    digitalWrite(9, HIGH);
    digitalWrite(10, LOW);
    digitalWrite(11,  HIGH);
  }

  if(buttonB == 1){
    delay(100);   //wait until switch  settles

    //set LEDs to 1011
    digitalWrite(8, HIGH);
    digitalWrite(9,  HIGH);
    digitalWrite(10, LOW);
    digitalWrite(11, HIGH);
  }

  if(buttonC == 1){
    delay(100);   //wait until switch settles

    //set  LEDs to 1100
    digitalWrite(8, LOW);
    digitalWrite(9, LOW);
    digitalWrite(10,  HIGH);
    digitalWrite(11, HIGH);
  }

  if(buttonD == 1){
    delay(100);   //wait until switch settles

    //set LEDs to 1101
    digitalWrite(8,  HIGH);
    digitalWrite(9, LOW);
    digitalWrite(10, HIGH);
    digitalWrite(11,  HIGH);
  }

}

Downloadable files

LED Bar Graph and Keypad Wiring

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