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  <title>Ertunç Özbay — Embedded Systems, Hardware Lab &amp; Open-Source Projects</title>
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          Ertunç Özbay
          <span class="brand-subtitle">embedded // hardware // open-source</span>
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        <span class="workshop-eyebrow">⚡ ELECTRICAL &amp; ELECTRONICS ENGINEERING // OPEN WORKBENCH</span>
        <h1 id="hero-heading"><span class="gradient-title">Hi, I’m Ertunç Özbay.</span></h1>
        <p class="hero-lead">
          I design embedded hardware, write bare-metal C &amp; FreeRTOS firmware, and build open-source systems from the transistor level up to Linux desktop tooling.
        </p>
        <p class="reading-width">
          Welcome to my engineering studio and notebook. Here you can inspect my real hardware prototypes, copy build/flash commands, browse source code, and download releases—from my <strong>ESP32-S3 2.4 GHz Multi-Functional RC Console</strong> and <strong>Dual-Core ESP32 16-Track MIDI Synthesizer</strong> to my <strong>4WD Autonomous Vehicle</strong> and <strong>Standalone Linux Game Launcher written in Rust</strong>.
        </p>
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          <a class="btn btn-primary" href="projects/index.html">🚀 Explore Projects, Code &amp; Downloads</a>
          <a class="btn btn-cyan" href="https://git.ertuncozbay.dev/ertunc-ozbay" rel="noopener noreferrer">💻 Git Server (@ertunc-ozbay)</a>
          <a class="btn btn-secondary" href="contact.html">✉️ Contact (ertunc.ozbay@outlook.com)</a>
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        <div class="stats-strip" aria-label="Workshop highlights">
          <div class="stat-pill">
            <span class="stat-value">4 Active Builds</span>
            <span class="stat-label">ESP32-S3, ESP32, 4WD RC &amp; Linux/Rust</span>
          </div>
          <div class="stat-pill">
            <span class="stat-value">ESP-IDF v5.2.2</span>
            <span class="stat-label">ISO C99, Dual-Core FreeRTOS &amp; KiCad</span>
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          <div class="stat-pill">
            <span class="stat-value">16-Track Synth</span>
            <span class="stat-label">Custom Python RLE MIDI-to-C Compiler</span>
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          <div class="stat-pill">
            <span class="stat-value">Direct Downloads</span>
            <span class="stat-label">Pre-Built Binaries, Firmware &amp; Schematics</span>
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      </section>

      <section class="section-block" aria-labelledby="active-builds-heading">
        <div class="section-header">
          <div>
            <span class="section-label">01 // Featured Hardware, Firmware &amp; Software Builds</span>
            <h2 id="active-builds-heading">Projects, Commands &amp; Downloads</h2>
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          <a href="projects/index.html">View all project code, commands &amp; PoC videos →</a>
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          <!-- Project 1 -->
          <article class="card card-amber">
            <div class="card-top">
              <div class="card-meta">
                <span class="badge badge-progress">Hardware Rev 0.1 → Phase 2 Console</span>
                <span>ESP32-S3 • 2.4 GHz RF</span>
              </div>
              <h3><a href="projects/multi-functional-controller.html">Multi-Functional RC Controller (MFC)</a></h3>
              <p>
                A handheld 2.4 GHz wireless transmitter and embedded control console powered by an <strong>ESP32-S3-N16R8</strong> (16 MB Flash / 8 MB Octal PSRAM), <strong>nRF24L01+ PA+LNA</strong> RF transceiver, dual <strong>K-Silver Hall-effect gimbals</strong>, and shared SPI2 <strong>1.3" ST7789 IPS TFT + MicroSD</strong> bus.
              </p>
              <ul class="tag-list" aria-label="Technologies">
                <li><span class="tag tag-esp">ESP32-S3-N16R8</span></li>
                <li><span class="tag tag-c">ESP-IDF C99</span></li>
                <li><span class="tag tag-hw">nRF24L01+ 2.4GHz</span></li>
                <li><span class="tag tag-python">KiCad Schematic</span></li>
              </ul>
            </div>
            <div class="card-actions">
              <a class="btn btn-primary" href="projects/multi-functional-controller.html">Code, Commands &amp; PoC Video</a>
              <a class="btn btn-emerald" href="/assets/downloads/multi-functional-controller.zip">⬇ Download ZIP</a>
              <a class="btn btn-secondary" href="https://git.ertuncozbay.dev/ertunc-ozbay/multi-functional-controller" rel="noopener noreferrer">Git Server</a>
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          <!-- Project 2 -->
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                <span class="badge badge-experimental">Active Prototype</span>
                <span>Dual-Core ESP32 • Audio &amp; UI</span>
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              <h3><a href="projects/midi-breadboard-instrument.html">MIDI Breadboard Instrument (Desk Rave 16-Track Symphony)</a></h3>
              <p>
                A standalone dual-core <strong>ESP32 MIDI synthesizer, drum sequencer, and 30 FPS SPI OLED visualizer</strong> with a custom <strong>Python RLE MIDI-to-C compiler</strong> (<code>midi_to_c.py</code>), hardware PCNT rotary encoder, passive melody piezo, and dual active drum buzzers.
              </p>
              <ul class="tag-list" aria-label="Technologies">
                <li><span class="tag tag-esp">ESP32 Dual-Core</span></li>
                <li><span class="tag tag-python">Python RLE Compiler</span></li>
                <li><span class="tag tag-synth">30 FPS SPI OLED</span></li>
                <li><span class="tag tag-c">FreeRTOS IPC</span></li>
              </ul>
            </div>
            <div class="card-actions">
              <a class="btn btn-primary" href="projects/midi-breadboard-instrument.html">Code, Commands &amp; PoC Video</a>
              <a class="btn btn-emerald" href="/assets/downloads/midi-breadboard-instrument.zip">⬇ Download ZIP</a>
              <a class="btn btn-secondary" href="https://git.ertuncozbay.dev/ertunc-ozbay/midi-breadboard-instrument" rel="noopener noreferrer">Git Server</a>
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          </article>

          <!-- Project 3 -->
          <article class="card card-emerald">
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                <span class="badge badge-active">In Development</span>
                <span>Robotics • Control Logic</span>
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              <h3><a href="projects/rc-autonomous-vehicle.html">RC and Autonomous 4WD Vehicle</a></h3>
              <p>
                A companion 4WD robotic vehicle platform designed to pair with the 2.4 GHz Multi-Functional Controller while exploring closed-loop motor control, telemetry feedback, and autonomous obstacle-avoidance logic.
              </p>
              <ul class="tag-list" aria-label="Technologies">
                <li><span class="tag tag-hw">4WD Robotics</span></li>
                <li><span class="tag tag-c">Embedded Control</span></li>
                <li><span class="tag tag-esp">2.4 GHz Telemetry</span></li>
              </ul>
            </div>
            <div class="card-actions">
              <a class="btn btn-primary" href="projects/rc-autonomous-vehicle.html">Telemetry Structs &amp; PoC Video</a>
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          </article>
        </div>
      </section>

      <!-- Quick Clone & Build Terminal Showcase -->
      <section class="section-block" aria-labelledby="quick-cli-heading">
        <div class="section-header">
          <div>
            <span class="section-label">02 // Quick Terminal Access</span>
            <h2 id="quick-cli-heading">Clone &amp; Build My Embedded Hardware Projects</h2>
          </div>
        </div>

        <div class="code-window">
          <div class="code-window-header">
            <span class="code-window-title">
              <span class="code-dots"><span class="code-dot red"></span><span class="code-dot amber"></span><span class="code-dot green"></span></span>
              bash — Clone &amp; Build ESP-IDF Firmware (Arch Linux / ESP-IDF v5.2.2)
            </span>
            <button type="button" class="copy-code-btn" data-copy-code>📋 Copy Commands</button>
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          <pre><code># 1. ESP32-S3 Multi-Functional Controller (ESP-IDF v5.2.2 + KiCad Schematic)
git clone https://git.ertuncozbay.dev/ertunc-ozbay/multi-functional-controller.git
cd multi-functional-controller/firmware &amp;&amp; source ~/esp/esp-idf/export.sh &amp;&amp; idf.py build

# 2. ESP32 16-Track MIDI Breadboard Synthesizer &amp; Python RLE Compiler
git clone https://git.ertuncozbay.dev/ertunc-ozbay/midi-breadboard-instrument.git
cd midi-breadboard-instrument &amp;&amp; python3 scripts/midi_to_c.py scripts/midillis/Alla_Turca/Alla_Turca.mid</code></pre>
        </div>
      </section>

      <section class="section-block" aria-labelledby="workshop-areas-heading">
        <div class="section-header">
          <div>
            <span class="section-label">03 // Inside This Studio</span>
            <h2 id="workshop-areas-heading">How I Approach Engineering</h2>
          </div>
        </div>

        <div class="card-grid">
          <div class="card card-amber">
            <div class="card-top">
              <span class="section-label">Hardware + Software</span>
              <h3>Understanding the Whole Stack</h3>
              <p>
                From decoupling capacitors, BJT switches, and SPI bus arbitration up to FreeRTOS tasks and Python/Rust tooling—I study how every layer connects so I can take full ownership of what I build.
              </p>
            </div>
            <a href="about.html">Read my engineering philosophy →</a>
          </div>

          <div class="card card-synth">
            <div class="card-top">
              <span class="section-label">Lab &amp; Bench Notes</span>
              <h3>The Open Workbench</h3>
              <p>
                Explore my active breadboard tests, RLE MIDI-to-C compression algorithms, hardware protection fixes, and reverse-engineering study notes.
              </p>
            </div>
            <a href="lab.html">Open the Lab Notebook →</a>
          </div>

          <div class="card card-emerald">
            <div class="card-top">
              <span class="section-label">Direct Contact</span>
              <h3>Collaborate &amp; Connect</h3>
              <p>
                Reach out directly via email at <code>ertunc.ozbay@outlook.com</code>, LinkedIn, or my self-hosted Git server to discuss embedded systems, electronics, or open-source builds.
              </p>
            </div>
            <a href="contact.html">View Contact &amp; Email Details →</a>
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        </div>
      </section>

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