diff --git a/src/sound/sound.cpp b/src/sound/sound.cpp
new file mode 100644
index 0000000..cbae621
--- /dev/null
+++ b/src/sound/sound.cpp
@@ -0,0 +1,98 @@
+#include "sound.h"
+#include "defs/defs.h"
+
+static const Note* currentMelody = nullptr;
+
+static uint16_t melodyLength = 0;
+static uint16_t currentNote = 0;
+
+static bool playing = false;
+
+static unsigned long nextNoteTime = 0;
+
+void sound_init() {
+    pinMode(SPK_PIN, OUTPUT);
+}
+
+void sound_playTone(uint16_t frequency, uint16_t duration) {
+    if (!soundEnabled) { return; }
+
+    currentMelody = nullptr;
+    melodyLength = 0;
+    currentNote = 0;
+
+    if (frequency == 0) {
+        noTone(SPK_PIN);
+    } else {
+        tone(SPK_PIN, frequency, duration);
+    }
+
+    playing = true;
+    nextNoteTime = millis() + duration;
+}
+
+void sound_playMelody(const Note* melody, uint16_t noteCount) {
+    if (!soundEnabled) { return; }
+
+    if (melody == nullptr || noteCount == 0) {
+        return;
+    }
+
+    currentMelody = melody;
+    melodyLength = noteCount;
+    currentNote = 0;
+    playing = true;
+    nextNoteTime = 0;
+}
+
+void sound_stop() {
+    noTone(SPK_PIN);
+    playing = false;
+    currentMelody = nullptr;
+    melodyLength = 0;
+    currentNote = 0;
+}
+
+bool sound_isPlaying() {
+    return playing;
+}
+
+void sound_update() {
+    if (!soundEnabled) {
+        sound_stop();
+        return;
+    }
+
+    if (!playing) {
+        return;
+    }
+
+    if (currentMelody == nullptr) {
+        if (millis() >= nextNoteTime) {
+            sound_stop();
+        }
+
+        return;
+    }
+
+    if (millis() < nextNoteTime) {
+        return;
+    }
+
+    if (currentNote >= melodyLength) {
+        sound_stop();
+        return;
+    }
+
+    const Note& note = currentMelody[currentNote];
+
+    if (note.frequency == 0) {
+        noTone(SPK_PIN);
+    } else {
+        tone(SPK_PIN, note.frequency, note.duration);
+    }
+
+    nextNoteTime = millis() + note.duration;
+
+    currentNote++;
+}
diff --git a/src/sound/sound.h b/src/sound/sound.h
new file mode 100644
index 0000000..1c02bde
--- /dev/null
+++ b/src/sound/sound.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <Arduino.h>
+
+struct Note {
+    uint16_t frequency;
+    uint16_t duration;
+};
+
+void sound_init();
+void sound_update();
+void sound_playTone(uint16_t frequency, uint16_t duration);
+void sound_playMelody(const Note* melody, uint16_t noteCount);
+void sound_stop();
+bool sound_isPlaying();
\ No newline at end of file