191 lines
10 KiB
HTML
191 lines
10 KiB
HTML
<!DOCTYPE html>
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<html lang="en" data-theme="colorful">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Lab & Experiment Notebook — Ertunç Özbay</title>
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<meta name="description" content="Workshop lab notebook of Ertunç Özbay: ESP32-S3 hardware protection notes, RLE MIDI-to-C compression tools, Linux Wine/DX11 experiments, and reverse-engineering study logs.">
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<link rel="icon" type="image/svg+xml" href="assets/images/favicon.svg">
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<link rel="stylesheet" href="assets/css/style.css?v=2">
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<body>
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<a class="skip-link" href="index.html#main-content">Skip to main content</a>
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<header class="site-header">
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<div class="container header-inner">
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<a class="site-brand" href="index.html">
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<span class="brand-mark" aria-hidden="true">EÖ</span>
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<span>
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Ertunç Özbay
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<span class="brand-subtitle">embedded // hardware // open-source</span>
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<div class="theme-switcher" role="group" aria-label="Select UI Theme">
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<button type="button" class="theme-btn" data-set-theme="colorful" aria-pressed="true">🎨 Colorful</button>
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<nav id="primary-navigation" class="site-nav" data-site-nav aria-label="Main navigation">
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<ul class="nav-list">
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<li><a class="nav-link" href="index.html">Home</a></li>
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<li><a class="nav-link" href="about.html">About</a></li>
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<li><a class="nav-link" href="projects/index.html">Projects</a></li>
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<li><a class="nav-link" href="blog/index.html">Blog</a></li>
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<li><a class="nav-link" href="lab.html" aria-current="page">Lab</a></li>
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<main id="main-content">
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<div class="container">
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<section class="workshop-hero" aria-labelledby="lab-heading">
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<span class="workshop-eyebrow">🔬 WORKSHOP BENCH // LAB NOTEBOOK</span>
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<h1 id="lab-heading"><span class="gradient-title">Lab & Experiment Notebook</span></h1>
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<p class="hero-lead">
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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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</p>
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</section>
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<!-- Section 1: Current experiments -->
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<section class="section-block" aria-labelledby="lab-current">
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<div class="section-header">
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<div>
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<span class="section-label">01 // Active Bench Breakthroughs</span>
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<h2 id="lab-current">Recent Hardware & Firmware Experiments</h2>
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</div>
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</div>
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<div class="card-grid-2">
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<div class="card card-synth">
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<div class="card-top">
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<div class="card-meta">
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<span class="badge badge-experimental">Solved on Breadboard</span>
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<span>ESP32 Dual-Core • Python RLE</span>
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</div>
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<h3>Defeating the 30 Hz MIDI "Strobe-Light" Bug & Piezo Bass Roll-Off</h3>
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<p>
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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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</p>
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</div>
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<div class="card-actions">
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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>
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<a class="btn btn-emerald" href="assets/downloads/desk_rave_16track_esp32.c" download="mmcontroller.c">⬇ Download 16-Track C Code</a>
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<a class="btn btn-secondary" href="projects/midi-breadboard-instrument.html">Full MIDI Project →</a>
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</div>
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</div>
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<div class="card card-amber">
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<div class="card-top">
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<div class="card-meta">
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<span class="badge badge-progress">Hardware Rev 0.1 → Phase 2</span>
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<span>ESP32-S3-N16R8 • SPI2 Bus</span>
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</div>
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<h3>ESP32-S3 Octal PSRAM Pin Collisions & Shared SPI2 Arbitration</h3>
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<p>
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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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</p>
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</div>
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<div class="card-actions">
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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>
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<a class="btn btn-emerald" href="assets/downloads/mfc_esp32s3_firmware.c" download="mmcontroller.c">⬇ Download S3 Firmware</a>
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<a class="btn btn-secondary" href="projects/multi-functional-controller.html">Full Controller Page →</a>
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</div>
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</div>
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</div>
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</section>
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<!-- Section 2: Software and conversion tools -->
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<section class="section-block" aria-labelledby="lab-software">
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<div class="section-header">
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<div>
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<span class="section-label">02 // Code & Systems Tooling</span>
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<h2 id="lab-software">Custom Compilers & Linux Runtime Tools</h2>
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</div>
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</div>
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<div class="card-grid-2">
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<div class="card card-coral">
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<div class="card-top">
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<div class="card-meta">
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<span class="badge badge-coral">KiCad • Hardware Design</span>
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<span>Schematic & PCB Capture</span>
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</div>
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<h3>KiCad Schematic Capture for ESP32-S3 Hardware (<code>mfc-1.kicad_sch</code>)</h3>
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<p>
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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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</p>
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</div>
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<div class="card-actions">
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<a class="btn btn-emerald" href="/assets/downloads/mfc-1.kicad_sch" download="mfc-1.kicad_sch">⬇ Download KiCad Schematic</a>
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<a class="btn btn-secondary" href="projects/multi-functional-controller.html">View Hardware Page →</a>
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</div>
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</div>
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<div class="card card-emerald">
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<div class="card-top">
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<div class="card-meta">
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<span class="badge badge-active">Python 3 • mido</span>
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<span>Embedded Audio Tooling</span>
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</div>
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<h3>RLE MIDI-to-C Struct Compiler (<code>midi_to_c.py</code>)</h3>
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<p>
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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>< MIDI 50</code>) to hardware percussion buzzers.
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</p>
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</div>
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<div class="card-actions">
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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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</div>
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</div>
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</div>
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</section>
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<!-- Section 3: Reverse-engineering learning -->
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<section class="section-block" aria-labelledby="lab-re">
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<div class="section-header">
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<div>
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<span class="section-label">03 // System Internals</span>
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<h2 id="lab-re">Reverse-Engineering & Low-Level Study Log</h2>
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</div>
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</div>
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<div class="callout-box magenta">
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<span class="callout-title">Looking Under the Hood</span>
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<p>
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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.
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</p>
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<p style="margin-bottom:0;">
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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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</p>
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</div>
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</section>
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</div>
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</main>
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<footer class="site-footer">
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<div class="container footer-inner">
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<div>
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<strong>Ertunç Özbay</strong> — Electrical & Electronics Engineering Student • <a href="mailto:ertunc.ozbay@outlook.com">ertunc.ozbay@outlook.com</a>
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</div>
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<ul class="footer-links" aria-label="Footer links">
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<li><a href="projects/index.html">Projects</a></li>
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<li><a href="blog/index.html">Blog</a></li>
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<li><a href="lab.html">Lab</a></li>
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<li><a href="contact.html">Contact</a></li>
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<li><a href="https://git.ertuncozbay.dev/ertunc-ozbay" rel="noopener noreferrer">Git Server</a></li>
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<li><a href="https://www.linkedin.com/in/ertunc-ozbay" rel="noopener noreferrer">LinkedIn</a></li>
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