Archiving a bunch of old stuff

oldstuff/arduino/msaqsg/ch04/Telegraph/Makefile

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+../../../arduino.mk

oldstuff/arduino/msaqsg/ch04/Telegraph/Telegraph.ino

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+void setup() {
+}
+
+void loop() {
+}

oldstuff/arduino/msaqsg/ch04/Telegraph/telegraph.cpp

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+// vim:filetype=arduino
+#include <ctype.h>
+#include <Arduino.h>
+#include "telegraph.h"
+
+const char* LETTERS[] = {
+    ".-",   // A
+    "-...", // B
+    "-.-.", // C
+    "-..",  // D
+    ".",    // E
+    "..-.", // F
+    "--.",  // G
+    "....", // H
+    "..",   // I
+    ".---", // J
+    "-.-",  // K
+    ".-..", // L
+    "--",   // M
+    "-.",   // N
+    "---",  // O
+    ".--.", // P
+    "--.-", // Q
+    ".-.",  // R
+    "...",  // S
+    "-",    // T
+    "..-",  // U
+    "...-", // V
+    ".--",  // W
+    "-..-", // X
+    "-.--", // Y
+    "--.."  // Z
+};
+
+const char* DIGITS[] = {
+    "-----", // 0
+    ".----", // 1
+    "..---", // 2
+    "...--", // 3
+    "....-", // 4
+    ".....", // 5
+    "-....", // 6
+    "--...", // 7
+    "---..", // 8
+    "----.", // 9
+};
+
+Telegraph::Telegraph(const int output_pin, const int dit_length) {
+    _output_pin = output_pin;
+    _dit_length = dit_length;
+    _dah_length = dit_length * 3;
+    pinMode(_output_pin, OUTPUT);
+}
+
+void Telegraph::output_code(const char* code) {
+    const unsigned int code_length = strlen(code);
+
+    for (unsigned int i = 0; i < code_length; i++) {
+        if (code[i] == '.') {
+            dit();
+        } else {
+            dah();
+        }
+
+        if (i != code_length - 1) {
+            delay(_dit_length);
+        }
+    }
+}
+
+void Telegraph::dit() {
+    Serial.print(".");
+    output_symbol(_dit_length);
+}
+
+void Telegraph::dah() {
+    Serial.print("-");
+    output_symbol(_dah_length);
+}
+
+void Telegraph::output_symbol(const int length) {
+    digitalWrite(_output_pin, HIGH);
+    delay(length);
+    digitalWrite(_output_pin, LOW);
+}
+
+void Telegraph::send_message(const char* message) {
+    unsigned int message_length = (unsigned int)strlen(message);
+    for (unsigned int i = 0; i < message_length; i++) {
+        const char current_char = toupper(message[i]);
+
+        if (isalpha(current_char)) {
+            output_code(LETTERS[current_char - 'A']);
+            delay(_dah_length);
+        } else if (isdigit(current_char)) {
+            output_code(DIGITS[current_char - '0']);
+            delay(_dah_length);
+        } else if (current_char == ' ') {
+            Serial.print(" ");
+            delay(_dit_length * 7);
+        }
+    }
+
+    Serial.println();
+}

oldstuff/arduino/msaqsg/ch04/Telegraph/telegraph.h

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+#ifndef __TELEGRAPH_H__
+#define __TELEGRAPH_H__
+
+class Telegraph {
+public:
+    Telegraph(const int output_pin, const int dit_length);
+    void send_message(const char* message);
+private:
+    void dit();
+    void dah();
+    void output_code(const char* code);
+    void output_symbol(const int length);
+
+    int _output_pin;
+    int _dit_length;
+    int _dah_length;
+};
+#endif