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  <title>Lab &amp; Experiment Notebook - Ertunç Özbay</title>
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          Ertunç Özbay
          <span class="brand-subtitle">Electrical &amp; Electronics Engineering</span>
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        <span class="workshop-eyebrow"> WORKSHOP BENCH // LAB NOTEBOOK</span>
        <h1 id="lab-heading"><span class="gradient-title">Lab &amp; Experiment Notebook</span></h1>
        <p class="hero-lead">
          Welcome to my open workbench. This page tracks my real engineering experiments, hardware debugging breakthroughs, Python/Rust tooling scripts, and reverse-engineering study notes.
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      <!-- Section 1: Current experiments -->
      <section class="section-block" aria-labelledby="lab-current">
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            <span class="section-label">Active Bench Breakthroughs</span>
            <h2 id="lab-current">Recent Hardware &amp; Firmware Experiments</h2>
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                <span class="badge badge-experimental">Solved on Breadboard</span>
                <span>ESP32 Dual-Core · Python RLE</span>
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              <h3>Defeating the 30 Hz MIDI "Strobe-Light" Bug &amp; Piezo Bass Roll-Off</h3>
              <p>
                While building the <a href="projects/midi-breadboard-instrument.html">16-Track MIDI Breadboard Instrument</a>, raw MIDI delta-slices caused the LEDs and 1.3" SPI OLED to strobe violently. Writing a custom Run-Length Encoding (RLE) compressor in Python (<code>midi_to_c.py</code>) and transposing bass-heavy tracks like <em>Seven Nation Army</em> +2 octaves solved both flash exhaustion and piezo acoustic roll-off.
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              <a class="btn btn-cyan" href="assets/downloads/midi_to_c.py" download="midi_to_c.py">Download midi_to_c.py</a>
              <a class="btn btn-emerald" href="assets/downloads/desk_rave_16track_esp32.c" download="mmcontroller.c">Download 16-Track C Code</a>
              <a class="btn btn-secondary" href="projects/midi-breadboard-instrument.html">Full MIDI Project →</a>
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                <span class="badge badge-progress">Hardware Rev 0.1 → Phase 2</span>
                <span>ESP32-S3-N16R8 · SPI2 Bus</span>
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              <h3>ESP32-S3 Octal PSRAM Pin Collisions &amp; Shared SPI2 Arbitration</h3>
              <p>
                On the <a href="projects/multi-functional-controller.html">Multi-Functional RC Controller</a>, the ESP32-S3-N16R8 reserves <code>GPIO 35–37</code> for internal Octal PSRAM/Flash. We remapped the shared SPI2 bus (<code>MOSI: 11, MISO: 13, SCK: 12</code>) with dedicated hardware CS lines for the nRF24L01+ (<code>CSN: 10</code>), MicroSD (<code>CS: 39</code>), and ST7789 IPS TFT (<code>CS: 40</code>).
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              <a class="btn btn-cyan" href="assets/downloads/mfc-1.kicad_sch" download="mfc-1.kicad_sch">Download KiCad Schematic</a>
              <a class="btn btn-emerald" href="assets/downloads/mfc_esp32s3_firmware.c" download="mmcontroller.c">Download S3 Firmware</a>
              <a class="btn btn-secondary" href="projects/multi-functional-controller.html">Full Controller Page →</a>
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      <!-- Section 2: Software and conversion tools -->
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            <span class="section-label">Code &amp; Systems Tooling</span>
            <h2 id="lab-software">Custom Compilers &amp; Linux Runtime Tools</h2>
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                <span class="badge badge-coral">KiCad · Hardware Design</span>
                <span>Schematic &amp; PCB Capture</span>
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              <h3>KiCad Schematic Capture for ESP32-S3 Hardware (<code>mfc-1.kicad_sch</code>)</h3>
              <p>
                In <a href="projects/multi-functional-controller.html">multi-functional-controller</a>, we captured a complete modular schematic linking dual Hall-effect analog gimbals, a 16-channel CD74HC4067 multiplexer, an nRF24L01+ PA+LNA RF module, and an SSD1306 I2C OLED display to an ESP32-S3.
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            <div class="card-actions">
              <a class="btn btn-emerald" href="/assets/downloads/mfc-1.kicad_sch" download="mfc-1.kicad_sch">Download KiCad Schematic</a>
              <a class="btn btn-secondary" href="projects/multi-functional-controller.html">View Hardware Page →</a>
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          <div class="card card-emerald">
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                <span class="badge badge-active">Python 3 · mido</span>
                <span>Embedded Audio Tooling</span>
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              <h3>RLE MIDI-to-C Struct Compiler (<code>midi_to_c.py</code>)</h3>
              <p>
                Converts multi-channel `.mid` files into compact C99 <code>SequenceStep</code> struct arrays (<code>{frequency, duration, kick_drum, hi_hat}</code>), automatically routing MIDI Channel 10 and low bass notes (<code>&lt; MIDI 50</code>) to hardware percussion buzzers.
              </p>
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              <a class="btn btn-secondary" href="https://git.ertuncozbay.dev/ertunc-ozbay/midi-breadboard-instrument/src/branch/main/scripts/midi_to_c.py" rel="noopener noreferrer">View Script on Git Server →</a>
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      <!-- Section 3: Reverse-engineering learning -->
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            <span class="section-label">System Internals</span>
            <h2 id="lab-re">Reverse-Engineering &amp; Low-Level Study Log</h2>
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          <span class="callout-title">Looking Under the Hood</span>
          <p>
            I study reverse engineering using <strong>Ghidra</strong>, <strong>x64dbg</strong>, <strong>radare2</strong>, and <strong>Cheat Engine</strong> to understand how compiled C/C++ binaries, memory layouts, calling conventions, and hardware registers work at the machine instruction level.
          </p>
          <p style="margin-bottom:0;">
            Every time I inspect a compiled binary or debug an ESP32 panic backtrace, it reinforces why deep knowledge of C, memory alignment, and Assembly is indispensable.
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        <strong>Ertunç Özbay</strong> - Electrical &amp; Electronics Engineering Student · <a href="mailto:ertunc.ozbay@outlook.com">ertunc.ozbay@outlook.com</a>
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