44 Analog Keyboard writing on a LCD

1/* 
2   simple code to test and use analog  kepads to make a full Keyboard  
3    
4    2021 ~ by rogermarin
5    this code is in public domain
6    thsi  program uses the serial monitor to see tue values for each button 
7    because  the hrdware di  not 100% reliable on the readings I gave a + - 5 ohms of tolerance  to all the mesurements 
8*/
9
10
11#include <LiquidCrystal_I2C.h>
12LiquidCrystal_I2C  lcd(0x27,16,2);
13
14int analogPin0 = A0; // Or any pin you are using 
15int  analogPin1 = A1; // Or any pin you are using 
16int analogPin2 = A2; // Or any  pin you are using 
17int val0 = 0;  // an auxiliar variable to store  the value
18int  val1 = 0;  // an auxiliar variable to store  the value
19int val2 = 0;  // an auxiliar  variable to store  the value
20char key;
21
22void setup () 
23{
24 Serial.begin  (9600); //Setup serial to use the serial monitor 
25
26
27// initialize the lcd  
28lcd.init();                      
29lcd.backlight();
30lcd.setCursor(0,0);
31}
32
33void  show (String key) //Here is where the things get print 
34{
35        if (key  == "Clear") //Clear Screen
36          {
37          lcd.init();                      
38          lcd.setCursor(0,0);
39          }
40        else if (key == "ENTER")  //Cahnges Line
41          {                      
42          lcd.setCursor(0,1);
43          }
44        else
45            {
46            lcd.print(key);
47            };
48delay(500);
49}
50void loop () // Here we read the Keyboard  
51{
52     val0 = analogRead (analogPin0); //3x4 keypad 
53     if (val0 >=  1020 and val0 <= 1024){show("9");};  
54     if (val0 >= 925 and val0<= 935){show("0");};  
55     if (val0 >= 845 and val0<= 855){show("Clear");};
56     if (val0 >=  785 and val0<= 795){show("O");};
57     if (val0 >= 725 and val0 <= 735){show  ("P");};
58     if (val0 >= 675 and val0 <=685 ){show("!");};
59     if (val0  >= 640 and val0 <= 645){show("K");};
60     if (val0 >= 600 and val0 <= 610){show("L");};
61     if (val0 >= 565 and val0<= 575){show("YES");};
62     if (val0 >= 530 and  val0 <= 550){show("M");};
63     if (val0 >= 500 and val0<=515){show(" ");};
64     if (val0 >= 485 and val0<=495){show("#");};
65
66     val1 = analogRead  (analogPin1); //4x4 keypad 1
67     if (val1 >= 1020 and val1 <= 1024){show ("5");};  
68     if (val1 >= 925 and val1 <= 935){show("6");}; 
69     if (val1 >= 845  and val1 <= 855){show("7");};
70     if (val1 >= 785 and val1 <= 795){show("8");};
71     if (val1 >= 675 and val1 <= 685){show("T");};
72     if (val1 >= 630 and  val1 <= 640){show("Y");};
73     if (val1 >= 595 and val1 <= 605){show("U");};
74     if (val1 >= 560 and val1 <= 570){show("I");};
75     if (val1 >= 500 and  val1 <= 510){show("F");}; 
76     if (val1 >= 480 and val1 <= 490){show("G");};
77     if (val1 >= 450 and val1 <= 460){show("H");};
78     if (val1 >= 435 and  val1 <= 445){show("J");};
79     if (val1 >= 400 and val1 <= 410){show("C");};
80     if (val1 >= 320 and val1 <= 330){show("V");};
81     if (val1 >= 265 and  val1 <= 275){show("B");};
82     if (val1 >= 233 and val1 <= 243){show("N");};
83    
84      val2 = analogRead (analogPin2); //4x4 kepay 2 
85     if (val2 >=  1020 and val2 <= 1024){show("1");};   
86     if (val2 >= 925 and val2 <= 935){show("2");};  
87     if (val2 >= 845 and val2 <= 855){show("3");}; 
88     if (val2 >= 785  and val2 <= 795){show("4");}; 
89     if (val2 >= 675 and val2 <= 685){show("Q");};
90     if (val2 >= 630 and val2 <= 640){show("W");}; 
91     if (val2 >= 595 and  val2 <= 605){show("E");}; 
92     if (val2 >= 560 and val2 <= 570){show("R");};  
93     if (val2 >= 500 and val2 <= 510){show("ARDUINO");}; 
94     if (val2  >= 480 and val2 <= 490){show("A");};
95     if (val2 >= 450 and val2 <= 460){show("S");};  
96     if (val2 >= 435 and val2 <= 445){show("D");};
97     if (val2 >= 400  and val2 <= 410){show("ENTER");};
98     if (val2 >= 320 and val2 <= 330){show("DELETE");};
99     if (val2 >= 265 and val2 <= 275){show("Z");};
100     if (val2 >= 233 and  val2 <= 243){show("X");}; 
101     
102}