This device is especially useful for HAM radio beginners, as well as SW listeners who can monitor CW communications without knowing Morse code.
Devices and components
Arduino-Nano
10k resistance
128x64 LCD with ST7565 driver
Diode 1N4148
Grove - Button (P)
capacitors
Materials and tools
Soldering kit
Software and tools
Arduino IDE
Project description
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}
Downloadable files
schematic
Schema.png
Note: Content and images are from: https://projecthub.arduino.cc/, with some modifications.
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