a blog about projects, teaching, programming and other stuff

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Teaching your fish tank LEDs new tricks

232

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


API Heaven ICO

506

finally an ICO for an existing product


Making an awesome dashboard for your crypto currencies in 3 steps

2.747

using InfluxDB, Grafana and PHP


How to defend your website with ZIP bombs

117.772

the good old methods still work today


Creating the safest ETH paper wallet with a Raspberry Pi

5.117

with a printer and without an internet connection


Accepting Ethereum payments without external services

4.264

You don't need to pay for merchant systems


DIY vertical hydroponic system

1.521

grow vegetables in small spaces


Making a simple Raspberry Pi Bitcoin/Ethereum trading bot

14.086

with rocket.chat and Slack status reporting


Is Guetzli useful in production?

1.304

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


Finding bombs in the forest

1.025

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

164.849

Thank god not all scammers are professionals


Forget Pay2Win - the time has come for Learn2Win

3.874

how to reward players in any game for academic achievements


My door sends me chat messages

19.825

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


DIY cloud lamp for fun and profit

3.016

ok, just for fun.. no profit involved


Letting students mod school computers

1.840

with some amazing results


How to visualize RADIUS connections

4.554

by parsing Windows Server log files


Raspberry Pi controlled power sockets

3.565

it's as easy as it sounds


My company just turned 10 and it was quite a ride

3.070

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


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

28.648

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


Water cooled NAS made from spare parts

3.773

with Macguyverish solutions for common problems


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

26.639

with LED backlight and and all the good stuff


Let's analyze over twenty thousand proxies

3.486

It won't get much better


Analyzing 443 free proxies - Only 21% are not shady

30.641

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?

1.271


Neue Reifeprüfung analyzed

1.225

The simple way to get a good grade


Repairing a closed loop CPU water cooler with aquarium tubing

3.616

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


Raspberry Pi 2 wireless temperature box

2.741

The π² + wifi + 1wire sensor = pure awesomeness


Chromebooks for Work & Classrooms

2.692

are they worth it?


Announcing: Socialcube LITE

1.433

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

3.252

they represent everything I love about computer science


My XP-based grading system

19.627

a modern approach to grading in the year 2014


Raspberry Pi controlled LEDs

12.680

to visualize the up-state of my servers


IKEA Server Rack

4.969

nope, not a lack rack


DIY hydroponic pot for ~36€

4.049

Easy to build and awesome for your plants


Temperature visualization

2.022

from 6 months of data


Raspberry Pi temperature monitor

4.151

with a nice graph and live updates


Why are free proxies free?

174.092

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


My door sends me emails

10.549

Simple and cheap Raspberry Pi burglar alarm


HTML5 heat spreading simulation

1.556

with a simple JS algorithm


hackthissite.org ascii code picture challenge

1.790


PHP script that filters moods from twitter

1.139

..how depressed is the web?