Adaptive Button Keyboard for Kids with Muscular Conditions

A simple 5 button USB keyboard using Logitech Adaptive Gaming Kit for kids with muscular conditions like myopathy or muscular dystrophy.

May 26, 2021

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10 respects

kids

communication

disability reduction

Components and supplies

Resistor 10k ohm

Arduino Micro

Breadboard (generic)

Project description

Code

arduino

Note that some variables are in catalan. 'Boto' means 'Button', 'Fila' means 'Row', 'Columna' means 'Column', 'StatusAnterior' means 'LastStatus'

1#include "Keyboard.h"
2
3// constants won't change. They're used  here to set pin numbers:
4const int button1Pin = 2;     // the number of the pushbutton  pin
5const int button2Pin = 3;     // the number of the pushbutton pin
6const  int button3Pin = 4;     // the number of the pushbutton pin
7const int button4Pin  = 5;     // the number of the pushbutton pin
8const int button5Pin = 6;     //  the number of the pushbutton pin
9
10
11// variables will change:
12int button1State  = 0;         // variable for reading the pushbutton status
13int button2State =  0;
14int button3State = 0;
15int button4State = 0;
16int button5State = 0;
17
18int  boto1status = 0;
19int boto2status = 0;
20int boto3status = 0;
21int boto4status  = 0;
22int boto5status = 0;
23int boto1statusanterior = 0;
24int boto2statusanterior  = 0;
25int boto3statusanterior = 0;
26int boto4statusanterior = 0;
27int boto5statusanterior  = 0;
28
29int fila = 0;
30int columna = 0;
31
32
33void setup() {
34  Serial.begin(9600);
35  Keyboard.begin();
36  // initialize the pushbutton pin as an input:
37  pinMode(button1Pin,  INPUT);
38  pinMode(button2Pin, INPUT);
39  pinMode(button3Pin, INPUT);
40  pinMode(button4Pin,  INPUT);
41  pinMode(button5Pin, INPUT);
42
43}
44
45void loop() {
46
47
48  // PULSACIO FÍSICA DE BOTONS ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
49
50  
51  button1State = digitalRead(button1Pin);
52  button2State = digitalRead(button2Pin);
53  button3State = digitalRead(button3Pin);
54  button4State = digitalRead(button4Pin);
55  button5State = digitalRead(button5Pin);
56
57  boto1statusanterior = boto1status;
58  boto2statusanterior = boto2status;
59  boto3statusanterior = boto3status;
60  boto4statusanterior = boto4status;
61  boto5statusanterior = boto5status;
62
63  if (button1State == HIGH) {
64    boto1status = 1;
65    delay (50);
66  }  else {
67    boto1status = 0;
68//    delay (50);
69  }
70  if (button2State  == HIGH) {
71    boto2status = 1;
72    delay (50);
73  } else {
74    boto2status  = 0;
75//    delay (50);
76  }
77  if (button3State == HIGH) {
78    boto3status  = 1;
79    delay (50);
80  } else {
81    boto3status = 0;
82//    delay (50);
83  }
84  if (button4State == HIGH) {
85    boto4status = 1;
86    delay (50);
87  } else {
88    boto4status = 0;
89//    delay (50);
90  }
91  if (button5State  == HIGH) {
92    boto5status = 1;
93    delay (50);
94  } else {
95    boto5status  = 0;
96//    delay (50);
97  }
98
99
100// ASSIGNAR FILES O COLUMNES SEGONS  EL BOTÓ PULSAT ++++++++++++++++++++++++++++++++++++++++++++++
101
102  if (boto1statusanterior  != boto1status) {
103    if (boto1status == 0) {
104      if (fila == 0) {
105        fila  = 1;
106      } else {
107        columna = 1;
108      }
109    }
110  }  
111  if (boto2statusanterior != boto2status) {
112    if (boto2status == 0) {
113      if  (fila == 0) {
114        fila = 2;
115      } else {
116        columna = 2;
117      }
118    }
119  }  
120  if (boto3statusanterior != boto3status) {
121    if  (boto3status == 0) {
122      if (fila == 0) {
123        fila = 3;
124      } else  {
125        columna = 3;
126      }
127    }
128  }  
129  if (boto4statusanterior  != boto4status) {
130    if (boto4status == 0) {
131      if (fila == 0) {
132        fila  = 4;
133      } else {
134        columna = 4;
135      }
136    }
137  }  
138  if (boto5statusanterior != boto5status) {
139    if (boto5status == 0) {
140      if  (fila == 0) {
141        fila = 5;
142      } else {
143        columna = 5;
144      }
145    }
146  }  
147
148
149// ESCRIU SEGONS FILA I COLUMNA
150
151    if  (fila != 0 && columna != 0) {
152
153      ////// VOCALS
154      
155      if (fila  == 1 && columna == 1) {
156        Serial.write("A");
157        Keyboard.write('a');
158      }
159      if (fila == 1 && columna == 2) {
160        Serial.write("E");
161        Keyboard.write('e');
162      }
163      if (fila == 1 && columna == 3)  {
164        Serial.write("I");
165        Keyboard.write('i');
166      }
167      if (fila == 1 && columna == 4) {
168        Keyboard.write('o');
169        Serial.write("O");
170      }
171      if (fila == 1 && columna == 5) {
172        Keyboard.write('u');
173        Serial.write("U");
174      }      
175
176      ////// CONSONANTS 1
177      
178      if (fila == 2 && columna == 1) {
179        Serial.write("C");
180        Keyboard.write('c');
181      }
182      if (fila == 2 && columna == 2)  {
183        Serial.write("D");
184        Keyboard.write('d');
185      }
186      if (fila == 2 && columna == 3) {
187        Serial.write("L");
188        Keyboard.write('l');
189      }
190      if (fila == 2 && columna == 4) {
191        Serial.write("N");
192        Keyboard.write('n');
193      }
194      if (fila == 2 && columna == 5)  {
195        Serial.write("R");
196        Keyboard.write('r');
197      }      
198
199      ////// CONSONANTS 2
200      
201      if (fila == 3 && columna == 1) {
202        Serial.write("S");
203        Keyboard.write('s');
204      }
205      if  (fila == 3 && columna == 2) {
206        Serial.write("T");
207        Keyboard.write('t');
208      }
209      if (fila == 3 && columna == 3) {
210        Serial.write("B");
211        Keyboard.write('b');
212      }
213      if (fila == 3 && columna == 4)  {
214        Serial.write("F");
215        Keyboard.write('f');
216      }
217      if (fila == 3 && columna == 5) {
218        Serial.write("G");
219        Keyboard.write('g');
220      }      
221      
222      ////// CONSONANTS 3
223      
224      if (fila  == 4 && columna == 1) {
225        Serial.write("M");
226        Keyboard.write('m');
227      }
228      if (fila == 4 && columna == 2) {
229        Serial.write("P");
230        Keyboard.write('p');
231      }
232      if (fila == 4 && columna == 3)  {
233        Serial.write("J");
234        Keyboard.write('j');
235      }
236      if (fila == 4 && columna == 4) {
237        Serial.write("X");
238        Keyboard.write('x');
239      }
240      if (fila == 4 && columna == 5) {
241        Serial.write("Z");
242        Keyboard.write('z');
243      }      
244      
245      fila = 0;
246      columna  = 0;      
247    }
248    if (fila == 5) {
249      Serial.println();          
250      Keyboard.write(10);
251      fila = 0;
252      columna = 0;      
253    }
254
255    
256}

#include "Keyboard.h"

// constants won't change. They're used  here to set pin numbers:
const int button1Pin = 2;     // the number of the pushbutton  pin
const int button2Pin = 3;     // the number of the pushbutton pin
const  int button3Pin = 4;     // the number of the pushbutton pin
const int button4Pin  = 5;     // the number of the pushbutton pin
const int button5Pin = 6;     //  the number of the pushbutton pin


// variables will change:
int button1State  = 0;         // variable for reading the pushbutton status
int button2State =  0;
int button3State = 0;
int button4State = 0;
int button5State = 0;

int  boto1status = 0;
int boto2status = 0;
int boto3status = 0;
int boto4status  = 0;
int boto5status = 0;
int boto1statusanterior = 0;
int boto2statusanterior  = 0;
int boto3statusanterior = 0;
int boto4statusanterior = 0;
int boto5statusanterior  = 0;

int fila = 0;
int columna = 0;


void setup() {
  Serial.begin(9600);
  Keyboard.begin();
  // initialize the pushbutton pin as an input:
  pinMode(button1Pin,  INPUT);
  pinMode(button2Pin, INPUT);
  pinMode(button3Pin, INPUT);
  pinMode(button4Pin,  INPUT);
  pinMode(button5Pin, INPUT);

}

void loop() {


  // PULSACIO FÍSICA DE BOTONS ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

  
  button1State = digitalRead(button1Pin);
  button2State = digitalRead(button2Pin);
  button3State = digitalRead(button3Pin);
  button4State = digitalRead(button4Pin);
  button5State = digitalRead(button5Pin);

  boto1statusanterior = boto1status;
  boto2statusanterior = boto2status;
  boto3statusanterior = boto3status;
  boto4statusanterior = boto4status;
  boto5statusanterior = boto5status;

  if (button1State == HIGH) {
    boto1status = 1;
    delay (50);
  }  else {
    boto1status = 0;
//    delay (50);
  }
  if (button2State  == HIGH) {
    boto2status = 1;
    delay (50);
  } else {
    boto2status  = 0;
//    delay (50);
  }
  if (button3State == HIGH) {
    boto3status  = 1;
    delay (50);
  } else {
    boto3status = 0;
//    delay (50);
  }
  if (button4State == HIGH) {
    boto4status = 1;
    delay (50);
  } else {
    boto4status = 0;
//    delay (50);
  }
  if (button5State  == HIGH) {
    boto5status = 1;
    delay (50);
  } else {
    boto5status  = 0;
//    delay (50);
  }


// ASSIGNAR FILES O COLUMNES SEGONS  EL BOTÓ PULSAT ++++++++++++++++++++++++++++++++++++++++++++++

  if (boto1statusanterior  != boto1status) {
    if (boto1status == 0) {
      if (fila == 0) {
        fila  = 1;
      } else {
        columna = 1;
      }
    }
  }  
  if (boto2statusanterior != boto2status) {
    if (boto2status == 0) {
      if  (fila == 0) {
        fila = 2;
      } else {
        columna = 2;
      }
    }
  }  
  if (boto3statusanterior != boto3status) {
    if  (boto3status == 0) {
      if (fila == 0) {
        fila = 3;
      } else  {
        columna = 3;
      }
    }
  }  
  if (boto4statusanterior  != boto4status) {
    if (boto4status == 0) {
      if (fila == 0) {
        fila  = 4;
      } else {
        columna = 4;
      }
    }
  }  
  if (boto5statusanterior != boto5status) {
    if (boto5status == 0) {
      if  (fila == 0) {
        fila = 5;
      } else {
        columna = 5;
      }
    }
  }  


// ESCRIU SEGONS FILA I COLUMNA

    if  (fila != 0 && columna != 0) {

      ////// VOCALS
      
      if (fila  == 1 && columna == 1) {
        Serial.write("A");
        Keyboard.write('a');
      }
      if (fila == 1 && columna == 2) {
        Serial.write("E");
        Keyboard.write('e');
      }
      if (fila == 1 && columna == 3)  {
        Serial.write("I");
        Keyboard.write('i');
      }
      if (fila == 1 && columna == 4) {
        Keyboard.write('o');
        Serial.write("O");
      }
      if (fila == 1 && columna == 5) {
        Keyboard.write('u');
        Serial.write("U");
      }      

      ////// CONSONANTS 1
      
      if (fila == 2 && columna == 1) {
        Serial.write("C");
        Keyboard.write('c');
      }
      if (fila == 2 && columna == 2)  {
        Serial.write("D");
        Keyboard.write('d');
      }
      if (fila == 2 && columna == 3) {
        Serial.write("L");
        Keyboard.write('l');
      }
      if (fila == 2 && columna == 4) {
        Serial.write("N");
        Keyboard.write('n');
      }
      if (fila == 2 && columna == 5)  {
        Serial.write("R");
        Keyboard.write('r');
      }      

      ////// CONSONANTS 2
      
      if (fila == 3 && columna == 1) {
        Serial.write("S");
        Keyboard.write('s');
      }
      if  (fila == 3 && columna == 2) {
        Serial.write("T");
        Keyboard.write('t');
      }
      if (fila == 3 && columna == 3) {
        Serial.write("B");
        Keyboard.write('b');
      }
      if (fila == 3 && columna == 4)  {
        Serial.write("F");
        Keyboard.write('f');
      }
      if (fila == 3 && columna == 5) {
        Serial.write("G");
        Keyboard.write('g');
      }      
      
      ////// CONSONANTS 3
      
      if (fila  == 4 && columna == 1) {
        Serial.write("M");
        Keyboard.write('m');
      }
      if (fila == 4 && columna == 2) {
        Serial.write("P");
        Keyboard.write('p');
      }
      if (fila == 4 && columna == 3)  {
        Serial.write("J");
        Keyboard.write('j');
      }
      if (fila == 4 && columna == 4) {
        Serial.write("X");
        Keyboard.write('x');
      }
      if (fila == 4 && columna == 5) {
        Serial.write("Z");
        Keyboard.write('z');
      }      
      
      fila = 0;
      columna  = 0;      
    }
    if (fila == 5) {
      Serial.println();          
      Keyboard.write(10);
      fila = 0;
      columna = 0;      
    }

    
}

Code

arduino

Note that some variables are in catalan. 'Boto' means 'Button', 'Fila' means 'Row', 'Columna' means 'Column', 'StatusAnterior' means 'LastStatus'

1#include "Keyboard.h"
2
3// constants won't change. They're used
4  here to set pin numbers:
5const int button1Pin = 2;     // the number of the pushbutton
6  pin
7const int button2Pin = 3;     // the number of the pushbutton pin
8const
9  int button3Pin = 4;     // the number of the pushbutton pin
10const int button4Pin
11  = 5;     // the number of the pushbutton pin
12const int button5Pin = 6;     //
13  the number of the pushbutton pin
14
15
16// variables will change:
17int button1State
18  = 0;         // variable for reading the pushbutton status
19int button2State =
20  0;
21int button3State = 0;
22int button4State = 0;
23int button5State = 0;
24
25int
26  boto1status = 0;
27int boto2status = 0;
28int boto3status = 0;
29int boto4status
30  = 0;
31int boto5status = 0;
32int boto1statusanterior = 0;
33int boto2statusanterior
34  = 0;
35int boto3statusanterior = 0;
36int boto4statusanterior = 0;
37int boto5statusanterior
38  = 0;
39
40int fila = 0;
41int columna = 0;
42
43
44void setup() {
45  Serial.begin(9600);
46
47  Keyboard.begin();
48  // initialize the pushbutton pin as an input:
49  pinMode(button1Pin,
50  INPUT);
51  pinMode(button2Pin, INPUT);
52  pinMode(button3Pin, INPUT);
53  pinMode(button4Pin,
54  INPUT);
55  pinMode(button5Pin, INPUT);
56
57}
58
59void loop() {
60
61
62
63  // PULSACIO FÍSICA DE BOTONS ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
64
65
66  
67  button1State = digitalRead(button1Pin);
68  button2State = digitalRead(button2Pin);
69
70  button3State = digitalRead(button3Pin);
71  button4State = digitalRead(button4Pin);
72
73  button5State = digitalRead(button5Pin);
74
75  boto1statusanterior = boto1status;
76
77  boto2statusanterior = boto2status;
78  boto3statusanterior = boto3status;
79
80  boto4statusanterior = boto4status;
81  boto5statusanterior = boto5status;
82
83
84  if (button1State == HIGH) {
85    boto1status = 1;
86    delay (50);
87  }
88  else {
89    boto1status = 0;
90//    delay (50);
91  }
92  if (button2State
93  == HIGH) {
94    boto2status = 1;
95    delay (50);
96  } else {
97    boto2status
98  = 0;
99//    delay (50);
100  }
101  if (button3State == HIGH) {
102    boto3status
103  = 1;
104    delay (50);
105  } else {
106    boto3status = 0;
107//    delay (50);
108
109  }
110  if (button4State == HIGH) {
111    boto4status = 1;
112    delay (50);
113
114  } else {
115    boto4status = 0;
116//    delay (50);
117  }
118  if (button5State
119  == HIGH) {
120    boto5status = 1;
121    delay (50);
122  } else {
123    boto5status
124  = 0;
125//    delay (50);
126  }
127
128
129// ASSIGNAR FILES O COLUMNES SEGONS
130  EL BOTÓ PULSAT ++++++++++++++++++++++++++++++++++++++++++++++
131
132  if (boto1statusanterior
133  != boto1status) {
134    if (boto1status == 0) {
135      if (fila == 0) {
136        fila
137  = 1;
138      } else {
139        columna = 1;
140      }
141    }
142  }  
143
144  if (boto2statusanterior != boto2status) {
145    if (boto2status == 0) {
146      if
147  (fila == 0) {
148        fila = 2;
149      } else {
150        columna = 2;
151
152      }
153    }
154  }  
155  if (boto3statusanterior != boto3status) {
156    if
157  (boto3status == 0) {
158      if (fila == 0) {
159        fila = 3;
160      } else
161  {
162        columna = 3;
163      }
164    }
165  }  
166  if (boto4statusanterior
167  != boto4status) {
168    if (boto4status == 0) {
169      if (fila == 0) {
170        fila
171  = 4;
172      } else {
173        columna = 4;
174      }
175    }
176  }  
177
178  if (boto5statusanterior != boto5status) {
179    if (boto5status == 0) {
180      if
181  (fila == 0) {
182        fila = 5;
183      } else {
184        columna = 5;
185
186      }
187    }
188  }  
189
190
191// ESCRIU SEGONS FILA I COLUMNA
192
193    if
194  (fila != 0 && columna != 0) {
195
196      ////// VOCALS
197      
198      if (fila
199  == 1 && columna == 1) {
200        Serial.write("A");
201        Keyboard.write('a');
202
203      }
204      if (fila == 1 && columna == 2) {
205        Serial.write("E");
206
207        Keyboard.write('e');
208      }
209      if (fila == 1 && columna == 3)
210  {
211        Serial.write("I");
212        Keyboard.write('i');
213      }
214
215      if (fila == 1 && columna == 4) {
216        Keyboard.write('o');
217        Serial.write("O");
218
219      }
220      if (fila == 1 && columna == 5) {
221        Keyboard.write('u');
222
223        Serial.write("U");
224      }      
225
226      ////// CONSONANTS 1
227
228      
229      if (fila == 2 && columna == 1) {
230        Serial.write("C");
231
232        Keyboard.write('c');
233      }
234      if (fila == 2 && columna == 2)
235  {
236        Serial.write("D");
237        Keyboard.write('d');
238      }
239
240      if (fila == 2 && columna == 3) {
241        Serial.write("L");
242        Keyboard.write('l');
243
244      }
245      if (fila == 2 && columna == 4) {
246        Serial.write("N");
247
248        Keyboard.write('n');
249      }
250      if (fila == 2 && columna == 5)
251  {
252        Serial.write("R");
253        Keyboard.write('r');
254      }      
255
256
257      ////// CONSONANTS 2
258      
259      if (fila == 3 && columna == 1) {
260
261        Serial.write("S");
262        Keyboard.write('s');
263      }
264      if
265  (fila == 3 && columna == 2) {
266        Serial.write("T");
267        Keyboard.write('t');
268
269      }
270      if (fila == 3 && columna == 3) {
271        Serial.write("B");
272
273        Keyboard.write('b');
274      }
275      if (fila == 3 && columna == 4)
276  {
277        Serial.write("F");
278        Keyboard.write('f');
279      }
280
281      if (fila == 3 && columna == 5) {
282        Serial.write("G");
283        Keyboard.write('g');
284
285      }      
286      
287      ////// CONSONANTS 3
288      
289      if (fila
290  == 4 && columna == 1) {
291        Serial.write("M");
292        Keyboard.write('m');
293
294      }
295      if (fila == 4 && columna == 2) {
296        Serial.write("P");
297
298        Keyboard.write('p');
299      }
300      if (fila == 4 && columna == 3)
301  {
302        Serial.write("J");
303        Keyboard.write('j');
304      }
305
306      if (fila == 4 && columna == 4) {
307        Serial.write("X");
308        Keyboard.write('x');
309
310      }
311      if (fila == 4 && columna == 5) {
312        Serial.write("Z");
313
314        Keyboard.write('z');
315      }      
316      
317      fila = 0;
318      columna
319  = 0;      
320    }
321    if (fila == 5) {
322      Serial.println();          
323
324      Keyboard.write(10);
325      fila = 0;
326      columna = 0;      
327    }
328
329
330    
331}

#include "Keyboard.h"

// constants won't change. They're used
  here to set pin numbers:
const int button1Pin = 2;     // the number of the pushbutton
  pin
const int button2Pin = 3;     // the number of the pushbutton pin
const
  int button3Pin = 4;     // the number of the pushbutton pin
const int button4Pin
  = 5;     // the number of the pushbutton pin
const int button5Pin = 6;     //
  the number of the pushbutton pin


// variables will change:
int button1State
  = 0;         // variable for reading the pushbutton status
int button2State =
  0;
int button3State = 0;
int button4State = 0;
int button5State = 0;

int
  boto1status = 0;
int boto2status = 0;
int boto3status = 0;
int boto4status
  = 0;
int boto5status = 0;
int boto1statusanterior = 0;
int boto2statusanterior
  = 0;
int boto3statusanterior = 0;
int boto4statusanterior = 0;
int boto5statusanterior
  = 0;

int fila = 0;
int columna = 0;


void setup() {
  Serial.begin(9600);

  Keyboard.begin();
  // initialize the pushbutton pin as an input:
  pinMode(button1Pin,
  INPUT);
  pinMode(button2Pin, INPUT);
  pinMode(button3Pin, INPUT);
  pinMode(button4Pin,
  INPUT);
  pinMode(button5Pin, INPUT);

}

void loop() {



  // PULSACIO FÍSICA DE BOTONS ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


  
  button1State = digitalRead(button1Pin);
  button2State = digitalRead(button2Pin);

  button3State = digitalRead(button3Pin);
  button4State = digitalRead(button4Pin);

  button5State = digitalRead(button5Pin);

  boto1statusanterior = boto1status;

  boto2statusanterior = boto2status;
  boto3statusanterior = boto3status;

  boto4statusanterior = boto4status;
  boto5statusanterior = boto5status;


  if (button1State == HIGH) {
    boto1status = 1;
    delay (50);
  }
  else {
    boto1status = 0;
//    delay (50);
  }
  if (button2State
  == HIGH) {
    boto2status = 1;
    delay (50);
  } else {
    boto2status
  = 0;
//    delay (50);
  }
  if (button3State == HIGH) {
    boto3status
  = 1;
    delay (50);
  } else {
    boto3status = 0;
//    delay (50);

  }
  if (button4State == HIGH) {
    boto4status = 1;
    delay (50);

  } else {
    boto4status = 0;
//    delay (50);
  }
  if (button5State
  == HIGH) {
    boto5status = 1;
    delay (50);
  } else {
    boto5status
  = 0;
//    delay (50);
  }


// ASSIGNAR FILES O COLUMNES SEGONS
  EL BOTÓ PULSAT ++++++++++++++++++++++++++++++++++++++++++++++

  if (boto1statusanterior
  != boto1status) {
    if (boto1status == 0) {
      if (fila == 0) {
        fila
  = 1;
      } else {
        columna = 1;
      }
    }
  }  

  if (boto2statusanterior != boto2status) {
    if (boto2status == 0) {
      if
  (fila == 0) {
        fila = 2;
      } else {
        columna = 2;

      }
    }
  }  
  if (boto3statusanterior != boto3status) {
    if
  (boto3status == 0) {
      if (fila == 0) {
        fila = 3;
      } else
  {
        columna = 3;
      }
    }
  }  
  if (boto4statusanterior
  != boto4status) {
    if (boto4status == 0) {
      if (fila == 0) {
        fila
  = 4;
      } else {
        columna = 4;
      }
    }
  }  

  if (boto5statusanterior != boto5status) {
    if (boto5status == 0) {
      if
  (fila == 0) {
        fila = 5;
      } else {
        columna = 5;

      }
    }
  }  


// ESCRIU SEGONS FILA I COLUMNA

    if
  (fila != 0 && columna != 0) {

      ////// VOCALS
      
      if (fila
  == 1 && columna == 1) {
        Serial.write("A");
        Keyboard.write('a');

      }
      if (fila == 1 && columna == 2) {
        Serial.write("E");

        Keyboard.write('e');
      }
      if (fila == 1 && columna == 3)
  {
        Serial.write("I");
        Keyboard.write('i');
      }

      if (fila == 1 && columna == 4) {
        Keyboard.write('o');
        Serial.write("O");

      }
      if (fila == 1 && columna == 5) {
        Keyboard.write('u');

        Serial.write("U");
      }      

      ////// CONSONANTS 1

      
      if (fila == 2 && columna == 1) {
        Serial.write("C");

        Keyboard.write('c');
      }
      if (fila == 2 && columna == 2)
  {
        Serial.write("D");
        Keyboard.write('d');
      }

      if (fila == 2 && columna == 3) {
        Serial.write("L");
        Keyboard.write('l');

      }
      if (fila == 2 && columna == 4) {
        Serial.write("N");

        Keyboard.write('n');
      }
      if (fila == 2 && columna == 5)
  {
        Serial.write("R");
        Keyboard.write('r');
      }      


      ////// CONSONANTS 2
      
      if (fila == 3 && columna == 1) {

        Serial.write("S");
        Keyboard.write('s');
      }
      if
  (fila == 3 && columna == 2) {
        Serial.write("T");
        Keyboard.write('t');

      }
      if (fila == 3 && columna == 3) {
        Serial.write("B");

        Keyboard.write('b');
      }
      if (fila == 3 && columna == 4)
  {
        Serial.write("F");
        Keyboard.write('f');
      }

      if (fila == 3 && columna == 5) {
        Serial.write("G");
        Keyboard.write('g');

      }      
      
      ////// CONSONANTS 3
      
      if (fila
  == 4 && columna == 1) {
        Serial.write("M");
        Keyboard.write('m');

      }
      if (fila == 4 && columna == 2) {
        Serial.write("P");

        Keyboard.write('p');
      }
      if (fila == 4 && columna == 3)
  {
        Serial.write("J");
        Keyboard.write('j');
      }

      if (fila == 4 && columna == 4) {
        Serial.write("X");
        Keyboard.write('x');

      }
      if (fila == 4 && columna == 5) {
        Serial.write("Z");

        Keyboard.write('z');
      }      
      
      fila = 0;
      columna
  = 0;      
    }
    if (fila == 5) {
      Serial.println();          

      Keyboard.write(10);
      fila = 0;
      columna = 0;      
    }


    
}

Downloadable files

Rough sketch

Scheme

Considering my lack of experience in electronics, I'm sure there is some way to optimize the scheme. But this is the one that works well for me at the moment.

Scheme

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