DIY Arduino Morse code Decoder and Trainer

1/* 
2 *  Morse code receiver
3 */
4
5#include <U8g2lib.h>
6#include <TimerOne.h>
7
8U8G2_ST7565_ERC12864_1_4W_SW_SPI u8g2 ( U8G2_R0, /* scl=*/  13 , /* si=*/  11 , /* cs=*/  10 , /* rs=*/  9 , /* rse=*/  8 ) ;
9
10byte inPin1 = 0;                  //analog input to telegraph key or radio output
11byte P1, P2;                      //button states
12int readPin1;                     //telegraph key or radio output variableradia
13int k, i;                         //iloop index
14int kropka;                       //dot length
15int z, s;                         //character pulses
16int p, r;                         //break pulses
17int wpm;                          //word per minute
18String znak_M;
19String litera_M;                  
20char S_str[6];
21char P_str[6];
22char wpm_str[2];
23char* znak;
24char* wiersz[12];                                 //char workline*
25char* wiersz1[12];                                //top line char*
26
27
28const byte index_key = 48;                        //number of characters in the array 48
29const char* Z_char[index_key] = {
30"a","b","c","d","e","f","g","h","i","j","k","l","m",
31"n","o","p","q","r","s","t","u","v","w","x","y","z",
32"0","1","2","3","4","5","6","7","8","9",
33"!","(",")","+",",","-",".","/","=","?","_"};
34
35const String Morse[index_key] = {                 //Morse code
36".-","-...","-.-.","-..",".","..-.","--.","....","..",".---","-.-",".-..","--",
37"-.","---",".--.","--.-",".-.","...","-","..-","...-",".--","-..-","-.--","--..",
38"-----",".----","..---","...--","....-",".....","-....","--...","---..","----.", 
39"-.-.--","-.--.","-.--.-",".-.-.","--..--","-....-",".-.-.-","-..-.","-...-","..--..","..--.-"};
40/*
41' (single apostrophe) • — — — — •
42" (quote) • — • • — •
43: (colon) — — — • • •
44; (semicolon) — • — • — •
45@ (monkey or at)  • — — • — •
46*/
47
48void setup() {
49  
50  Serial.begin(9600);
51  u8g2.begin();
52  u8g2.setContrast(210);
53  Timer1.initialize(1000);
54  Timer1.attachInterrupt(Zliczaj);
55}
56
57void loop() {
58  //Serial.println(s);
59  //delay(100); 
60  Display(); 
61}
62
63void Display() {
64  //sprintf(S_str,"%d", s);
65  //sprintf(P_str,"%d", r);
66  u8g2.setFontMode(1);
67  u8g2.setFont(u8g2_font_10x20_tr);
68  u8g2.firstPage();
69  do {
70     u8g2.drawStr(0, 15, "Morse"); 
71     u8g2.drawStr(75, 15, wpm_str); 
72     u8g2.drawStr(98, 15, "w/m");
73     //u8g2.drawStr(75, 30, S_str);
74     //u8g2.drawStr(105, 30, P_str);
75     for (k = 0; k < 12; k++){  
76       u8g2.drawStr(k*10, 40, wiersz1[k] );   //top line
77       u8g2.drawStr(k*10, 60, wiersz[k] );    //workline
78     }
79  } while ( u8g2.nextPage() );
80  delay(10);
81}
82  
83void Zliczaj(){
84  readPin1 = analogRead(inPin1);
85  if (readPin1 > 10 ) {             //key is pressed
86    z++;
87    if (z == 1){
88      r = p;
89      //Display();                    //Displays the length of the last pause
90      //delay(5);
91      p = 0;
92    }
93  }
94  if (readPin1 <= 10) {             //key released
95    p++;
96    if (p == 1) {
97      s = z;
98      if ( kropka == 0){
99         kropka = s ;
100         //wpm = 1200/s;
101         //sprintf(wpm_str,"%d", wpm);
102      }
103      if ( z > 5 && z < 1.5 * kropka){ znak_M = "."; kropka = z ;}
104      if ( z > 2 * kropka ){ znak_M = "-";}
105      if ( r < 2 * kropka){ litera_M += znak_M;}
106      if ( litera_M.length() == 0 ) {litera_M = znak_M;}
107      z = 0;
108    }
109    if (p == 2 * kropka) {
110      wpm = 1200/kropka;
111      if (wpm > 90) {wpm = 0 ; z = 0;}
112      sprintf(wpm_str,"%d", wpm);
113      if ( litera_M.length() > 0 ) {
114        ZnajdzZnak();
115        i++;
116        wiersz[i-1] = znak;
117        if (i > 11) {
118          for (int k = 0; k < 12; k++) {
119            wiersz1[k] = " ";                        //delete the top line
120            wiersz1[k] = wiersz[k];                  //rewriting characters from the working line to the top line
121            wiersz[k] = " ";                         //delete work line    
122          }
123          i = 0;
124        } 
125      }   
126      Display();                                   //displays the read characters
127   }
128    if (p == 100 * kropka && i > 0) {
129       for (int k = 0; k < 12; k++) {
130          wiersz1[k] = " ";                        //rewriting characters from the working line to the top line
131          wiersz1[k] = wiersz[k];                  //rewriting characters from the working line to the top line
132          wiersz[k] = " ";                         //delete work line    
133        }
134        i = 0;
135        Display();                                //Displays the characters read
136    }
137  }
138}
139
140void ZnajdzZnak(){
141  znak = "";
142  for (k = 0; k <= index_key; k++){
143     if (Morse[k] == litera_M) {
144        znak = Z_char[k];            //converting the key code to a letter
145        break;
146     }
147  }
148  k = 0;
149  litera_M = "";
150}