Index · 09 builds

Projects.

Open hardware we are designing, machining, soldering and breaking — out loud. Photos, schematics and BOMs go up as we go.

Active09
Open-source100 %
UpdatedMay 2026
Self-hosted server rack — SklepCentrum
Active · v2
01 / 09

SklepCentrum

Self-hosted server rack. NAS and compute for scRNA-seq, protein design and a Minecraft server. HA K8s, 4 nodes.

Stack
HA K8s
Hosts
4 nodes
Status
running
Read the build
Smart Basement sensor stack
Operating
02 / 09

Smart Basement

CO₂, CH₄, CO, temperature, humidity and pressure logged live. Controls the basement light and door system. Grafana on SklepCentrum.

MCU
3× ATmega328P + RPi Zero
Sensors
CO₂ · CO · CH₄ · T · RH · P
Status
operating
Read the build
Enxt long-tail e-bike
Prototype done
03 / 09

Enxt

A long-tail e-bike for hauling tools, groceries and a second human across town. Aluminium frame, every part designed to attach to it.

Type
e-bike
Drive
1800 W · 48 V
Phase
prototype
Read the build
Automatic feeding router for milling machine
Testing · rev 1
04 / 09

Automatic Feeding Router

Stepper-driven automatic feed for a manual milling machine — STM32F103 + TB6600HG + GLCD 128×64. Lets the operator focus on the cut.

MCU
STM32F103RBT6
PCB
rev 1 · 16/08/25
Status
testing
Read the build
URX — open-source handheld console
holtyc.com/urx
05 / 09

URX

Open-source handheld with a red dot-matrix display and six action buttons. Running an Arduino Nano Every, documented on the GitHub wiki. Competed at SOC, Stretech and Maker Faire.

MCU
Arduino Nano Every
Display
red dot-matrix
Shown at
SOC · Stretech · MF
Open holtyc.com/urx
HolTyc Watch — open-source smartwatch PCB
On sale
06 / 09

HolTyc Watch

Smartwatch designed and engineered from scratch by Czech students. 4× 7-segment display, 12 RGB LEDs, motion wake, alien shooter game, USB-C. Every part is open-source — and it is on sale now.

MCU
STM32L031 · 32 MHz
Battery
~50 d · 6 mo standby
Status
on sale
Open holtyc.com/watch
CD4 CTL — single-cell research
Research
07 / 09

CD4 CTL

Cytotoxic CD4⁺ T cells across public scRNA-seq atlases. R, Seurat, and a long evening reading Phan, Collora and Upadhyay.

Pipeline
10x · Seurat
Compute
Solek-1 · K8s job
Status
analysis
Read the build
HolTyc RC car — 3D-printed, Arduino-based
Driving
08 / 09

RC Car

A pocket-sized RC car — every part 3D-printed in ABS, an Arduino Nano on top, hobby gearmotors below, and a custom 2.4 GHz handset. My very first project, spring 2020.

MCU
Arduino Nano
Build
3D-printed ABS
Status
driving
Read the build
HolTyc RC ship — 3D-printed, Arduino-based
Floating
09 / 09

RC Ship

A printed-hull RC boat. Watertight PLA shell, brushed motor, servo rudder, Arduino Nano control board — sized for the bath and the local pond.

MCU
Arduino Nano
Hull
3D-printed PLA
Status
floating
Read the build