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Apps, hardware, and workbench notes from Max in Wasbüttel.

Tinkerer · apps · hardware

Notes from
the workbench.

I’m Max, a tinkerer in Wasbüttel. This is where I document the small apps and hardware projects I build for problems I encounter myself.

bluecherlab / nowJuly 2026
01 SleepTrack AudioAndroid · Google Play Available 02 WakeFromFariOS · Android · Self-hosted Private beta 03 OutlaysmacOS · Windows · Self-hosted Public demo 04 CarScreenESP32-P4 · LVGL · OVMS Open source
Workbench notes by MaxWasbüttel, DE

Project archive

Apps, hardware, and experiments.

Each entry records what prompted the build, what works today, and which parts are still unfinished.

Live productAvailable

SleepTrack Audio

Finds the moment you fell asleep during an audiobook, locally through Health Connect.

In use

Resume at the right point the next morning.

Open product site
Mobile & homelabPrivate beta

WakeFromFar

Wakes home servers through a private tunnel without opening ports or using a cloud relay.

In use

Family can start Jellyfin or Immich safely without asking the admin.

View project
Outlays dashboard with synthetic sample data Synthetic demo
Local-first financePublic demo

Outlays

Combines receipts, orders, OCR, and manual expenses in a local analytics workspace.

In use

Spending, discounts, and recurring costs become understandable.

View project
CarScreen mounted in a Seat Mii while driving 86 km/h · 52% SOC · 9°C
Hardware build storyOpen source

CarScreen

A round EV add-on display for the Seat Mii with live data and a custom mount.

In use

State of charge, battery temperature, and power stay visible while driving.

View project

Workbench note

CarScreen: how missing measurements became a custom vehicle display

The build story follows the path from the first missing OVMS values through ESP32-P4 and LVGL to the mount that now travels in my Seat Mii.

Read the workbench note
CarScreen mounted in a Seat Mii while driving 86 km/h · 52% SOC · 9°C

Development notes

What I’m working on now.

All notes
Live

SleepTrack Audio

Available on Google Play, with focus on reliable sleep-time detection and a calm morning flow.

Private beta

WakeFromFar

Tunnel setup, user roles, and native clients are being hardened against real home-network scenarios.

Public demo

Outlays

The demo already shows the product breadth; next come installation, signing, and a tighter core scope.

About Max

Tinkering across software, hardware, and everyday life.

I build these projects in my spare time in Wasbüttel. Most begin with something missing from everyday life and end with code, a prototype, or a workbench note.

GitHub
Working approach
  • Start with a problem I have encountered myself.
  • Keep the first useful version small.
  • Document limits and unfinished parts alongside the results.

Contact

Questions, ideas, or a similar setup?

Write to me at max@bluecherlab.com. I read every message myself.