Justinas Petkauskas

Projects

featured

Buzzer receiver, transmitter, and one clicker.

Hybrid Quizbowl Buzzers

2026 / ESP-IDF, ESP-NOW, KiCad, Fusion

Semi-wireless ESP32 based quizbowl buzzers built on custom ESP-NOW layer.

The flip-climb mechanism on the bench, with its concentric pipes, sprockets and chain.

2026 FRC Flip Climb

2026 / Fusion, FusionCAM, Mach3Mill

Flip climb mechanism for 2026 FRC game that transmits 400Nm torques to flip and hold 115+ lb robot.

The JPL.mp3 digital music player.

Classical MP3 Player

2025 / PlatformIO, SQLite, KiCad, FreeCAD

Novel ESP32 based MP3 player featuring custom, classical music-focused SQL schema.

as featured on Hackaday / Aug 2025

earlier

The finished turntable playing a record with headphones plugged into the new front jack.

AT-LP60X Headphone Mod

2024 / KiCad, Fusion

Headphone amp, volume control and jack integrated into a turntable that shipped without one.

The CartridgeMP3 with a cartridge leaning against its front face.

CartridgeMP3

2022 / Arduino, Fusion, VS1053

MP3 player that selects tracks from physical 8-bit cartridges read over a 12-pin interface.

as featured on Hackaday / May 2022