a blog about projects, teaching, programming and other stuff

Never miss a post by liking this blog on Facebook

DIY vertical hydroponic system

25

grow vegetables in small spaces


Making a simple Raspberry Pi Bitcoin/Ethereum trading bot

3.006

with rocket.chat and Slack status reporting


Is Guetzli useful in production?

652

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


Finding bombs in the forest

407

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

160.661

Thank god not all scammers are professionals


Forget Pay2Win - the time has come for Learn2Win

3.552

how to reward players in any game for academic achievements


My door sends me chat messages

18.400

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


DIY cloud lamp for fun and profit

2.559

ok, just for fun.. no profit involved


Letting students mod school computers

1.544

with some amazing results


How to visualize RADIUS connections

3.245

by parsing Windows Server log files


Raspberry Pi controlled power sockets

2.941

it's as easy as it sounds


My company just turned 10 and it was quite a ride

2.776

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


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

27.899

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


Water cooled NAS made from spare parts

3.396

with Macguyverish solutions for common problems


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

21.852

with LED backlight and and all the good stuff


Let's analyze over twenty thousand proxies

2.754

It won't get much better


Analyzing 443 free proxies - Only 21% are not shady

29.155

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?

1.008


Neue Reifeprüfung analyzed

1.096

The simple way to get a good grade


Repairing a closed loop CPU water cooler with aquarium tubing

2.780

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


Raspberry Pi 2 wireless temperature box

2.124

The π² + wifi + 1wire sensor = pure awesomeness


Chromebooks for Work & Classrooms

2.528

are they worth it?


Announcing: Socialcube LITE

1.329

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

2.948

they represent everything I love about computer science


My XP-based grading system

18.939

a modern approach to grading in the year 2014


Raspberry Pi controlled LEDs

12.539

to visualize the up-state of my servers


IKEA Server Rack

4.197

nope, not a lack rack


DIY hydroponic pot for ~36€

3.830

Easy to build and awesome for your plants


Temperature visualization

1.850

from 6 months of data


Raspberry Pi temperature monitor

3.867

with a nice graph and live updates


Why are free proxies free?

168.740

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


My door sends me emails

10.148

Simple and cheap Raspberry Pi burglar alarm


HTML5 heat spreading simulation

1.349

with a simple JS algorithm


hackthissite.org ascii code picture challenge

1.583


PHP script that filters moods from twitter

986

..how depressed is the web?