From 96d20d8d73f4429a679ce38e98ab1c43924587e3 Mon Sep 17 00:00:00 2001
From: josepmarti <josep.marti.elias@gmail.com>
Date: Tue, 3 Dec 2024 23:46:20 +0100
Subject: [PATCH] Day 04

---
 docs/index.md           |   3 +-
 docs/solutions/04/04.md | 277 ++++++++++++++++++++++++++++++++++++++++
 mkdocs.yml              |   4 +-
 3 files changed, 280 insertions(+), 4 deletions(-)
 create mode 100644 docs/solutions/04/04.md

diff --git a/docs/index.md b/docs/index.md
index 3179b3f..81041a0 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -19,8 +19,7 @@ hide:
 1. Let's see your graphic design skills
 
 !!! example annotate "4. Talk morse to me (1)"
-    Day 04
-    [](solutions/04/04.md)
+    [Day 04](solutions/04/04.md)
 1. -... .- .-. -.. ..- .. -. ---
 
 !!! warning annotate "5. Jingle Bells! (1)"
diff --git a/docs/solutions/04/04.md b/docs/solutions/04/04.md
new file mode 100644
index 0000000..47e9580
--- /dev/null
+++ b/docs/solutions/04/04.md
@@ -0,0 +1,277 @@
+# Day four:
+
+Communicate using morse code using the Barduino.  
+
+dot dot dash... Use your resources to encode a message, and try to decode the rest of messages! 
+
+Here is my solution, using the LED and the buzzer. Try to do it yourself first, and check this one if you don't manage. :winking_face:
+
+## Possible solution!
+
+### Arduino code
+
+```c++
+const int led = 48;
+const int buzzer = 14;
+const int freq = 800;
+
+const int wait = 200;  // Duration of a unit
+
+String message = "Bon dia Pere";
+
+void setup() {
+  pinMode(led, OUTPUT);
+  ledcAttachPin(buzzer, 1);
+  //pinMode(buzzer, OUTPUT);
+  Serial.begin(115200);
+  delay(2000); //wait 2 seconds to start transmitting
+
+  for (int i = 0; i < message.length(); i++) {
+    char letter = toLowerCase(message[i]);
+    Serial.print(letter);
+    morse(letter);
+    delay(wait * 2);  // wait 3 units if time after each character (1 in each letter and 2 here)
+
+  }
+}
+
+void loop() {
+}
+
+void dot() {
+  digitalWrite(led, HIGH);
+  ledcWriteTone(1, freq);
+  delay(wait);
+  digitalWrite(led, LOW);
+  ledcWriteTone(1, 0);
+  delay(wait);  //space between parts of a letter
+}
+
+void dash() {
+  digitalWrite(led, HIGH);
+  ledcWriteTone(1, freq);
+  delay(wait * 3);  // A dash are 3 dots
+  digitalWrite(led, LOW);
+  ledcWriteTone(1, 0);
+  delay(wait);  //space between parts of a letter
+}
+
+void morse(char letter) {
+  switch (letter) {
+    case 'a':
+      dot();
+      dash();
+      break;
+    case 'b':
+      dash();
+      dot();
+      dot();
+      dot();
+      break;
+    case 'c':
+      dash();
+      dot();
+      dash();
+      dot();
+      break;
+    case 'd':
+      dash();
+      dot();
+      dot();
+      break;
+    case 'e':
+      dot();
+      break;
+    case 'f':
+      dot();
+      dot();
+      dash();
+      dot();
+      break;
+    case 'g':
+      dash();
+      dash();
+      dot();
+      break;
+    case 'h':
+      dot();
+      dot();
+      dot();
+      dot();
+      break;
+    case 'i':
+      dot();
+      dot();
+      break;
+    case 'j':
+      dot();
+      dash();
+      dash();
+      dash();
+      break;
+    case 'k':
+      dash();
+      dot();
+      dash();
+      break;
+    case 'l':
+      dot();
+      dash();
+      dot();
+      dot();
+      break;
+    case 'm':
+      dash();
+      dash();
+      break;
+    case 'n':
+      dash();
+      dot();
+      break;
+    case 'o':
+      dash();
+      dash();
+      dash();
+      break;
+    case 'p':
+      dot();
+      dash();
+      dash();
+      dot();
+      break;
+    case 'q':
+      dash();
+      dash();
+      dot();
+      dash();
+      break;
+    case 'r':
+      dot();
+      dash();
+      dot();
+      break;
+    case 's':
+      dot();
+      dot();
+      dot();
+      break;
+    case 't':
+      dash();
+      break;
+    case 'u':
+      dot();
+      dot();
+      dash();
+      break;
+    case 'v':
+      dot();
+      dot();
+      dot();
+      dash();
+      break;
+    case 'w':
+      dot();
+      dash();
+      dash();
+      break;
+    case 'x':
+      dash();
+      dot();
+      dot();
+      dash();
+      break;
+    case 'y':
+      dash();
+      dot();
+      dash();
+      dash();
+      break;
+    case 'z':
+      dash();
+      dash();
+      dot();
+      dot();
+      break;
+    case '0':
+      dash();
+      dash();
+      dash();
+      dash();
+      dash();
+      break;
+    case '1':
+      dot();
+      dash();
+      dash();
+      dash();
+      dash();
+      break;
+    case '2':
+      dot();
+      dot();
+      dash();
+      dash();
+      dash();
+      break;
+    case '3':
+      dot();
+      dot();
+      dot();
+      dash();
+      dash();
+      break;
+    case '4':
+      dot();
+      dot();
+      dot();
+      dot();
+      dash();
+      break;
+    case '5':
+      dot();
+      dot();
+      dot();
+      dot();
+      dot();
+      break;
+    case '6':
+      dash();
+      dot();
+      dot();
+      dot();
+      dot();
+      break;
+    case '7':
+      dash();
+      dash();
+      dot();
+      dot();
+      dot();
+      break;
+    case '8':
+      dash();
+      dash();
+      dash();
+      dot();
+      dot();
+      break;
+    case '9':
+      dash();
+      dash();
+      dash();
+      dash();
+      dot();
+      break;
+    case ' ':
+      delay(wait * 5);  //wait 7 units of time if there is a space (1 from the last character, 5 here and 1 in the loop)
+    default:
+      break;
+  }
+}
+```
+
+## Hero shot
+
+<video controls autoplay loop style="display: block; margin: auto;">
+    <source src="../../../video/day04.mp4" type="video/mp4">
+</video>
\ No newline at end of file
diff --git a/mkdocs.yml b/mkdocs.yml
index 2216665..797d127 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -15,8 +15,8 @@ nav:
   - Solutions:
     - Day 1: solutions/01/01.md
     - Day 2: solutions/02/02.md
-    #- Day 3: solutions/03/03.md
-    #- Day 4: solutions/04/04.md
+    - Day 3: solutions/03/03.md
+    - Day 4: solutions/04/04.md
     #- Day 5: solutions/05/05.md
     #- Day 6: solutions/06/06.md
     #- Day 7: solutions/07/07.md