a blog about projects, teaching, programming and other stuff

Never miss a post by liking this blog on Facebook

Is Guetzli useful in production?

541

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


Finding bombs in the forest

375

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

160.178

Thank god not all scammers are professionals


Forget Pay2Win - the time has come for Learn2Win

3.531

how to reward players in any game for academic achievements


My door sends me chat messages

18.110

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


DIY cloud lamp for fun and profit

2.520

ok, just for fun.. no profit involved


Letting students mod school computers

1.522

with some amazing results


How to visualize RADIUS connections

3.105

by parsing Windows Server log files


Raspberry Pi controlled power sockets

2.890

it's as easy as it sounds


My company just turned 10 and it was quite a ride

2.753

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


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

27.862

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


Water cooled NAS made from spare parts

3.357

with Macguyverish solutions for common problems


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

21.123

with LED backlight and and all the good stuff


Let's analyze over twenty thousand proxies

2.484

It won't get much better


Analyzing 443 free proxies - Only 21% are not shady

28.803

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?

1.002


Neue Reifeprüfung analyzed

1.089

The simple way to get a good grade


Repairing a closed loop CPU water cooler with aquarium tubing

2.666

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


Raspberry Pi 2 wireless temperature box

2.067

The π² + wifi + 1wire sensor = pure awesomeness


Chromebooks for Work & Classrooms

2.515

are they worth it?


Announcing: Socialcube LITE

1.321

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

2.928

they represent everything I love about computer science


My XP-based grading system

18.883

a modern approach to grading in the year 2014


Raspberry Pi controlled LEDs

12.532

to visualize the up-state of my servers


IKEA Server Rack

4.124

nope, not a lack rack


DIY hydroponic pot for ~36€

3.816

Easy to build and awesome for your plants


Temperature visualization

1.838

from 6 months of data


Raspberry Pi temperature monitor

3.837

with a nice graph and live updates


Why are free proxies free?

167.424

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


My door sends me emails

10.097

Simple and cheap Raspberry Pi burglar alarm


HTML5 heat spreading simulation

1.330

with a simple JS algorithm


hackthissite.org ascii code picture challenge

1.572


PHP script that filters moods from twitter

979

..how depressed is the web?