ni.c

also known as Willi Thiel

Projects

All these projects were created with the power of open source.

  • The Ebbe forecast view: income and spending per month with the projected balance
  • Owl Be There: one person's days on the left, the whole group as a heatmap on the right, with the best day standing out
  • Architecture diagram: an MCP client reaches mcp-hub through a reverse proxy, which serves each server under its own path Coding
    MCP Servers
  • The assembled ESPtemp board with an ESP8266 and an HTU21D sensor in an acrylic case, next to its 18650 cell
  • Screenshot of Vanaja
  • Raspberry Pi and Arduino on a breadboard
  • The omniwheel robot Eve
  • Screenshot of the blog nightsi.de

Vanaja

An open source HTML5 RPG

Vanaja is an open source 2D HTML5 RPG, created with the RPGjs Framework. It has not a lot of functionality yet, but you can move around and kill some enemies.

https://vanaja.willithiel.net

Screenshot of Vanaja

heimcontrol.js

Home automation

Open source home automation in Node.js using Raspberry PI and Arduino.

https://ni-c.github.io/heimcontrol.js/

Raspberry Pi and Arduino on a breadboard

Ebbe

Budget forecast

Ebbe projects recurring income and fixed costs month by month, so you can see when it gets tight — before it does. It only looks forward: no ledger, no bank import.

https://ebbe.onl

The Ebbe forecast view: income and spending per month with the projected balance

Owl Be There

Find a day everyone can make

Owl Be There helps a group pick a day — for a match, a tournament, a hike or a barbecue. The organiser picks the candidate days, everyone marks the days they can make it on a calendar, and the calendar turns into a heatmap that shows at a glance when the whole group is free.

No accounts, no cookies, no tracking — and self-hostable as one container with one SQLite file.

https://owlbethere.app

https://github.com/ni-c/owl-be-there

Owl Be There: one person's days on the left, the whole group as a heatmap on the right, with the best day standing out

ESPtemp

Battery-powered ESP8266 sensor

A battery-powered sensor that measures temperature, humidity and its own battery voltage, sends the readings to a server such as Home Assistant over MQTT, and then goes into deep sleep for five minutes to save energy.

https://github.com/ni-c/ESPtemp

The assembled ESPtemp board with an ESP8266 and an HTU21D sensor in an acrylic case, next to its 18650 cell

Eve

Autonomous omniwheel robot

Eve is an autonomous omniwheel robot. The heart of the robot is a Raspberry PI.

https://github.com/ni-c/eve

The omniwheel robot Eve

nightsi.de

Blog

In my blog nightsi.de i write about hacks, photography and travel.

https://nightsi.de

Screenshot of the blog nightsi.de