I build things that switch, sense, and talk back.

Power electronics, embedded systems and high voltage. In my first year of Power Engineering at TUM, Munich.

Move across the signal. Drag across the signal.

Projects

  • 4-Quadrant Bidirectional Current Source Ongoing

    48 V H-bridge that pushes current in both directions, through zero, without flinching. Full closed-loop PI control on a TI C2000, hardware OCP that doesn't wait for firmware, custom 4-layer PCB. Still in progress.

    Power electronics, TI C2000, H-bridge, INA240A2, MCP6567

  • Europe Travel Map July 2025

    A0 wall map where pressing a physical button fires up a photo slideshow for that country on a small TFT. 40 buttons, an ESP32, and a lot of wire routing. It's hanging on a wall now, which is the best possible outcome.

    ESP32, MCP23017, ILI9488 TFT, microSD

  • Speaking Duolingo Owl December 2025

    Duolingo plush that hits the API at 9 PM, and if you haven't done your lesson, starts guilt-tripping you, out loud. Built as a birthday gift for someone on a 1000+ day streak. ESP32-S2, I2S audio, surprisingly good at its job.

    ESP32-S2, I2S audio, Duolingo API, LittleFS, IoT

  • CAN Bus Mini-Workshop November 2025

    Workshop I designed to teach CAN bus from scratch in an afternoon. Three progressively harder tasks, then a team game at the end. The kind of thing where people leave actually understanding what an arbitration ID is.

    ESP32, Arduino UNO, MCP2515, CAN bus, DS18B20

Writing

    About

    Oliwia Hejduk

    I studied Computer Science & Engineering at TU/e, now I'm starting my MSc degree in Power Engineering at TUM. I spend most of my time on power electronics and PCB design. It started with a half-bridge that barely worked and I've been hooked since.

    Right now I'm building a bidirectional current source for magnet testing: full H-bridge, hardware overcurrent protection, the whole thing designed from schematic to board. It's the kind of project where you learn something new every time you turn on the bench supply. I like problems where the datasheet doesn't quite tell you everything.

    Outside of that I'm starting my research at the High Voltage Lab at TUM, run and hike sometimes and learning how to dance hip-hop. I also love to write... articles coming up I promise!

    Contact

    The best way to reach me is by email at [email protected].

    You can also find me on LinkedIn and GitHub, or call +48 791 130 881.