a blog about projects, teaching, programming and other stuff

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Teaching your fish tank LEDs new tricks

192

for just a few bucks and you can even make some virtual clouds


API Heaven ICO

444

finally an ICO for an existing product


Making an awesome dashboard for your crypto currencies in 3 steps

2.298

using InfluxDB, Grafana and PHP


How to defend your website with ZIP bombs

117.329

the good old methods still work today


Creating the safest ETH paper wallet with a Raspberry Pi

4.630

with a printer and without an internet connection


Accepting Ethereum payments without external services

3.823

You don't need to pay for merchant systems


DIY vertical hydroponic system

1.455

grow vegetables in small spaces


Making a simple Raspberry Pi Bitcoin/Ethereum trading bot

12.257

with rocket.chat and Slack status reporting


Is Guetzli useful in production?

1.266

It's much better than google promised - 51% smaller images


Finding bombs in the forest

994

treasure hunters make it easy to find them


How a scammer stole 500$ from me and in the end begged me not to tell his parents

164.571

Thank god not all scammers are professionals


Forget Pay2Win - the time has come for Learn2Win

3.858

how to reward players in any game for academic achievements


My door sends me chat messages

19.771

Raspberry Pi powered door sensor and Rocket.Chat bot with some neat info


DIY cloud lamp for fun and profit

2.992

ok, just for fun.. no profit involved


Letting students mod school computers

1.835

with some amazing results


How to visualize RADIUS connections

4.449

by parsing Windows Server log files


Raspberry Pi controlled power sockets

3.498

it's as easy as it sounds


My company just turned 10 and it was quite a ride

3.058

also: about the time Thomas Schranz and I almost invented Dropbox


That (not so) awesome time the police raided my home

28.617

lesson learned: Don't click on links random people send you


Water cooled NAS made from spare parts

3.758

with Macguyverish solutions for common problems


DIY: Cheap wall mounted, water cooled PC for 51$

26.248

with LED backlight and and all the good stuff


Let's analyze over twenty thousand proxies

3.440

It won't get much better


Analyzing 443 free proxies - Only 21% are not shady

30.519

what about the other 79%?


What would happen if you'd embed a remote JPEG with a HTTP link but the remote server is forcing HTTPS?

1.265


Neue Reifeprüfung analyzed

1.216

The simple way to get a good grade


Repairing a closed loop CPU water cooler with aquarium tubing

3.557

air bubbles... those f***ing air bubbles


Raspberry Pi 2 wireless temperature box

2.661

The π² + wifi + 1wire sensor = pure awesomeness


Chromebooks for Work & Classrooms

2.683

are they worth it?


Announcing: Socialcube LITE

1.423

My proof-of-concept evolved to a intuitive platform which is free for every educational institution


Why hackits are the first thing I teach new classes

3.232

they represent everything I love about computer science


My XP-based grading system

19.576

a modern approach to grading in the year 2014


Raspberry Pi controlled LEDs

12.666

to visualize the up-state of my servers


IKEA Server Rack

4.921

nope, not a lack rack


DIY hydroponic pot for ~36€

4.039

Easy to build and awesome for your plants


Temperature visualization

2.006

from 6 months of data


Raspberry Pi temperature monitor

4.121

with a nice graph and live updates


Why are free proxies free?

173.461

because it's an easy way to infect thousands of users and collect their data


My door sends me emails

10.516

Simple and cheap Raspberry Pi burglar alarm


HTML5 heat spreading simulation

1.542

with a simple JS algorithm


hackthissite.org ascii code picture challenge

1.782


PHP script that filters moods from twitter

1.130

..how depressed is the web?