a blog about projects, teaching, programming and other stuff

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Teaching your fish tank LEDs new tricks

135

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


API Heaven ICO

370

finally an ICO for an existing product


Making an awesome dashboard for your crypto currencies in 3 steps

2.011

using InfluxDB, Grafana and PHP


How to defend your website with ZIP bombs

116.728

the good old methods still work today


Creating the safest ETH paper wallet with a Raspberry Pi

4.232

with a printer and without an internet connection


Accepting Ethereum payments without external services

3.377

You don't need to pay for merchant systems


DIY vertical hydroponic system

1.380

grow vegetables in small spaces


Making a simple Raspberry Pi Bitcoin/Ethereum trading bot

10.769

with rocket.chat and Slack status reporting


Is Guetzli useful in production?

1.232

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


Finding bombs in the forest

970

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

164.172

Thank god not all scammers are professionals


Forget Pay2Win - the time has come for Learn2Win

3.851

how to reward players in any game for academic achievements


My door sends me chat messages

19.650

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


DIY cloud lamp for fun and profit

2.965

ok, just for fun.. no profit involved


Letting students mod school computers

1.825

with some amazing results


How to visualize RADIUS connections

4.283

by parsing Windows Server log files


Raspberry Pi controlled power sockets

3.437

it's as easy as it sounds


My company just turned 10 and it was quite a ride

3.044

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


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

28.590

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


Water cooled NAS made from spare parts

3.737

with Macguyverish solutions for common problems


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

25.727

with LED backlight and and all the good stuff


Let's analyze over twenty thousand proxies

3.389

It won't get much better


Analyzing 443 free proxies - Only 21% are not shady

30.367

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?

1.258


Neue Reifeprüfung analyzed

1.210

The simple way to get a good grade


Repairing a closed loop CPU water cooler with aquarium tubing

3.464

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


Raspberry Pi 2 wireless temperature box

2.568

The π² + wifi + 1wire sensor = pure awesomeness


Chromebooks for Work & Classrooms

2.671

are they worth it?


Announcing: Socialcube LITE

1.414

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

3.218

they represent everything I love about computer science


My XP-based grading system

19.525

a modern approach to grading in the year 2014


Raspberry Pi controlled LEDs

12.658

to visualize the up-state of my servers


IKEA Server Rack

4.850

nope, not a lack rack


DIY hydroponic pot for ~36€

4.031

Easy to build and awesome for your plants


Temperature visualization

1.995

from 6 months of data


Raspberry Pi temperature monitor

4.092

with a nice graph and live updates


Why are free proxies free?

172.638

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


My door sends me emails

10.459

Simple and cheap Raspberry Pi burglar alarm


HTML5 heat spreading simulation

1.526

with a simple JS algorithm


hackthissite.org ascii code picture challenge

1.772


PHP script that filters moods from twitter

1.119

..how depressed is the web?