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DIY Nuki Opener

Hobby - May 2021

My Intercom System wasn't compatible with the Nuki Opener, so I build a quick prototype as a weekend project that essentially does the same thing. Open the Main Entrance Door of a residential building whenever someone rings and a webhook was called before. In combination with an Home Assistant automation it functionality is almost identical to the commercial product.

Used Tools:

Arduino

Links:

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PWCamera

Hobby - December 2020

A simple camera PWA to show the capabilities of the web. It works completely offline, you can use all the connected cameras and is using the File Access API to save all photos in a local directory on your device.

Used Tools:

CSS3HTML5JavascriptServiceWorker

Links:

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PWACalculator

Hobby - May 2020

A simple calculator web app that works like native and has full offline support. No network connection required.

Used Tools:

CSS3HTML5JavascriptServiceWorker

Links:

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GitHub File Sync Action

Hobby - May 2020

I wanted to configure some actions for multiple repositories in a single location, so I wrote a GitHub Action to sync files between git repositories.

Used Tools:

GitHub ActionsJavascriptNode.js

Links:

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Surge.Sh Teardown GitHub Action

Work - December 2019

At work we  deploy all pull requests to surge.sh. To reduce the amount of deployed pages I developed this GitHub Action to tear down all projects that match a RegEx

Used Tools:

GitHub ActionsJavascript

Links:

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SmartLight V3

Hobby - November 2019

Version 3 of my own Smart Home Lighting System is featuring gradient support for using it as a light alert in the morning. It is planned to be compatible with a wide variety of devices and supports all features of the previous versions plus a beautiful new minimalistic ui.

Used Tools:

ArduinoCSS3EasyEDAFirebaseGitHTML5JavascriptsolderingTravis CIVue.jsVuex

Links:

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Two Channel Picker

Hobby - November 2019

As part of SmartLight V3 I developed a two channel color picker that I also published on npmjs.org.

Used Tools:

CSS3GitHTML5JavascriptVue.js

Links:

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Markdown 2 Latex Converter

Hobby - August 2019

I was to lazy to write my bachelor thesis with Latex, so I've build a Markdown to Latex Converter 😅.

Used Tools:

GitJavascriptNode.js

Links:

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Vue filter component

Work - July 2019

Vue Filter Component for FeathersJS inspired by the UI of Googles Webmaster Console. The complete UI is exchangeable and it offers an API to customise the output query for different databases.

Used Tools:

CSS3FeathersJSGitJavascriptMongoDBVue.js

Links:

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Dedent Tabs

Hobby - June 2019

The package dmnd/dedent is pretty awesome, but it is lacking support for tab indentation and is not maintained anymore. For that reason I continued maintaining it and published dedent-tabs which is now downloaded over 10.000x per Week.

Used Tools:

JavascriptNode.js

Links:

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Slate.JS Sorting Task Plugin

University - February 2019

As part of the course "Web Development with Web Frameworks" we have developed a Slate.JS plugin, which will transfer the educational concept of sorting tasks into the digital world. We focused our development on a super simple, intuitive design for students and teachers. In addition, we focused on writing really clean code to ensure a smooth transition to the core editor development team.

Used Tools:

BEMCSS3GitHTML5JavascriptReactSlate.js

Links:

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Nextcloud Metadata Plugin

University - January 2019

For research, my fellow students and I implemented an prototype of an Nextcloud Plugin that can display additional, externally saved metadata for files.

Used Tools:

GitJavascriptNextcloudPHP

Links:

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Console TicTacToe

Hobby - November 2018

Just for fun, I created a basic TicTacToe game that you can run in your browsers console.

Used Tools:

GitJavascript

Links:

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Modular Text Editor

University - July 2018

I think Smalltalk is a dead language, but we got the task to develop a component-based, modular editor, similar to the editors of Gitbook.io and Wordpress (Gutenberg). We have done our best to ensure good usability.

Used Tools:

Coveralls.ioGitSCRUMSmalltalkSqueakTravis CI

Links:

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Metadaten Editor

University - June 2018

In the seminar "Web Programming and Web Frameworks" we developed a content management software for teaching content.

Used Tools:

CSS3FeathersJSGitHTML5JavascriptTravis CIVue.js

Links:

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Robot Competition

University - May 2018

We had many really cheap electronic components, a piece of plywood and the task of building a robot that can navigate to a destination with simple light sensors. Our robot was one of only two robots that could move and the only one that could find the target, so we won this competition.

Used Tools:

ArduinoLaser Cuttersoldering

Links:

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SmartLight V2

Hobby - April 2018

Version 2 of SmartLight was very experimental to test out new real time websocket communication and fancy features like live-music synchronisation.

Used Tools:

FirebaseGitJavascriptVue.js

Links:

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SmartLight V1

Hobby - September 2017

My own smart home lighting system. I designed it with the goal of a simple setup process, an frictionless UI and very cheap hardware.

Used Tools:

ArduinoCSS3EasyEDAGitHTML5Javascriptsoldering

Links:

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RC Car Lighting System

Hobby - August 2017

With the help of an Arduino I read out the throttle control of the RC receiver and was able to control the brake light accordingly. Additionally I developed circuit boards for the LEDs to mount them easily.

Used Tools:

ArduinoKiCadsoldering

Links:

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FastFeed

Hobby - May 2017

Mobile Internet is really expensive in Germany. I developed FastFeed to be able to read news even when the reception is poor. A super small web-app, which causes only minimal traffic.

Used Tools:

CSS3HTML5JavascriptServiceWorker

Links:

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CleanIT WordPress Theme

Hobby - March 2017

My first own Wordpress theme. The focus of the development was on performance, minimalism and extensibility. To this day, I use it in my blog to ensure optimal loading times.

Used Tools:

CSS3HTML5JavascriptPHPWordpress

Links:

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"Quissen"-App

Work - December 2016

For the company Lightball SSC I finished the development of the quiz app "Quissen". It is using Angular 1 with an Wordpress REST Backend.

Used Tools:

Angular 1CSS3GitHTML5ionicJavascriptWordpress

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Websnooze V1

Hobby - August 2016

Having multiple monitors at your desktop is awesome, but sometimes you aren't using it. Why not showing some calm images on it to keep you relaxed and balanced on work. Websnooze was an application that showed you images from unsplash.com in your new tab page or on a dedicated webpage.

Used Tools:

Chrome ExtensionCSS3HTML5JavascriptServiceWorker

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Open Gallery

Hobby - July 2016

Photosharing and Collecting made easy. The concept of this file sharing software is, to easily collect all photos from all participants at an event. It's meant to be a higher quality, low effort replacement for photo-sharing in WhatsApp-Groups.

Used Tools:

CSS3HTML5JavascriptPHPSQLSQLite

Links:

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Stepcraft CNC GRBL Controler

Hobby - May 2016

Our school got an awesome Stepcraft CNC but the software was horrible. Sadly the used controller was proprietary. The solution: I wired up an Arduino (with a lot of reverse engineering), uploaded some software. We can now use any public available GRBL Software like the one provided by easel.com. 

Used Tools:

ArduinoCNCEasel soldering

Links:

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New Theme For School Library Homepage

Hobby - April 2016

A friend of me programmed a book inventory system for our school library, but the UI was pretty ugly (sorry my friend). So we came together and I updated the css files without changing the HTML structure as best as possible to make it more appealing to the eye.

Used Tools:

CSS3

Links:

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LED Coaster

Hobby - April 2016

We had an CNC machine, and I had some free-time and a lot of ideas. One of those was an cool coaster concept that doubled as a lamp at the late afternoon BBQ parties. The Coaster illuminates your drink and you get some colorful light at your party while still be able to see your friends.

Used Tools:

CNCEasel soldering

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School Information Telegram Bot

Hobby - November 2015

As a student I was tired of actively searching for new substitution lessons or school news. So I developed a telegram bot that can inform me about these things. @archenhold_bot

Used Tools:

PHPPythonTelegram

Links:

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VisualAdvise

Work - July 2015

In a design competition of the company "Visual Advise" I could convince and was allowed to design the factsheet of the company.

Used Tools:

Gimp

Links:

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School App

Hobby - April 2015

For our school I developed an app, which could manage the most important data for students, such as substitutions, study plans and homework.

Used Tools:

MIT App InventorPHPThunkable App Builder

Links:

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Substitution Plan Upload System

Hobby - March 2015

My school uses an custom made software for displaying and managing substitutions. I extended this software with an automatic upload script to our school server. We can now view our substitutions online on our website.

Used Tools:

CSS3HTML5Javascript

Links:

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Mobile Friendly Theme For School Homepage

Hobby - June 2014

At our school we had the privilege to have full control over our website, unfortunately it was not mobile friendly at that time. So my first real web development project was to make this site mobile and friendly. The architecture isn't great, but it works with solid performance thanks to clever caching techniques.

Used Tools:

CSS3HTML5JavascriptPHP

Links:

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Robocup World Championship Eindhoven

Hobby - June 2013

After the success at the German Championship in the Robocup Junior, my team and I were allowed to participate at the World Championship in Eindhoven. Unfortunately this year we were not as successful as last year. Nevertheless it was a great experience and we had a lot of fun.

Used Tools:

ArduinoBricxCCKiCadsoldering

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Robocup 2013 - German Champion

Hobby - March 2013

After successful participation at the World Championships 2012, my team and I finally managed to become German Champion in the Robocup Junior Competition in 2013.

Used Tools:

ArduinoBrixCCKiCadsoldering

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Robocup 2012 - World Champion

Hobby - June 2012

After successful qualification both at the Berlin and the German Championships, my team and I won a competition at the Robocup Junior World Championship 2012 in Mexico City. So I can proudly call myself a world champion . The task was to build and program a line following robot that also had the ability to locate and rescue a victim within a room.

Used Tools:

ArduinoBricxCCKiCadsoldering

Links: