Tag: Arduino

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A MIDI step sequencer built on a Raspberry Pi Pico, with an OLED display, a rotary encoder, and an 8×8 NeoPixel matrix used as the step grid.

Besides manually programmed tracks, it supports a set of generative sequencing strategies — Euclidean rhythms, L-systems, cellular automata, Markov chains, arpeggios, call-and-response, drones, and more — each one turning a track into an algorithm instead of a fixed pattern. Scale/root-note awareness, adjustable mutation, and chord-note support keep the generated parts musical. Multiple tracks can run different strategies and step counts at once for polyrhythms.

Sends MIDI notes over a hardware serial DIN port, with optional MIDI input via an optocoupler. Can run tethered via USB or portably off a LiPo battery and a 5V booster board.

To make this extra fun, I repurposed a kids’ toy briefcase and made it a bit punk.

Status: Finished.

Project page: https://git.dejvino.cz/dejvino/PicoWaveTracker

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Keyboard converter between a Zbrojovka Consul 262.5 terminal keyboard and a Videoton VDX 52600 terminal.

This is a multi-purpose converter that enables the two vintage devices to be used on their own (1. USB keyboard adapter, 2. keyboard emulator over serial) or together to form an honest VT52 terminal.

Status: Semi-finished.
Reading from the keyboard works. Writing to the terminal works. Though it is unreliable and I haven’t discovered all the keycodes that the terminal accepts.

Project page: https://git.dejvino.cz/dejvino/consul-vdx-term-keyboard-converter

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Replace the old electronics of your tapedeck with an mp3 player, all while keeping the retro controls working!

A conversion project that takes a beautiful piece of obsolete hardware and gives it a new life. The aim is to retain as much of the look and the controls as possible. Buttons still control the playback, turning the knobs impacts the sound. Yet there is a tiny MP3 player board that loads the music from a microSD card and the turning cassette reels are just for show.

Status: Finished.

Project page: https://git.dejvino.cz/dejvino/tapedeck-player

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Powering on many devices at once might trip a circuit breaker due to the initial surge. A slow-start power socket avoids this by introducing a delay for the grid to stabilize.

The device uses an MCU to gradually energize a strip of power sockets using relays. This way, the startup is more gentle and there is no need to manually connect and disconnect devices.

Status: Finished.

Project page: https://git.dejvino.cz/dejvino/slow-start-power-socket

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3D printable case for a Geiger Counter kit packing a battery, ON/OFF switches and a servo motor to display the measurement.

Enclosed is a “RadiationD-v1.1 (CAJOE)” Geiger Counter kit that does all the work. A standard power bank for an 18650 battery cell provides the power. An Arduino reads the radiation ticks and drives a servo motor to display a time-windowed value. Switches enable or disable 1) the whole system 2) the clicking sound 3) the servo display. The case is modeled in OpenSCAD with the battery and the servo parts of the case being optional.

Status: Finished.

Project page: https://git.dejvino.cz/dejvino/GeigerCounterEnclosure