Table Saw Ikea Hack


That was a real fast and amazing hack. I wanted to create me a easy to use table saw and was finally locking for a box which reduce the noise of the saw. I did take a Ikea Samla Box 24l. I did long times the saw not use because it is so annyoing noisy. With the box I could minimize the loudness of the saw so much that you do not need ear plugs anymore. And by the way it brought so many cool features with it that I have to post some pictures here. The box collectes the sawdust. Cause it is transparent you can see when the box is full and from time to time you have to unscrew the box and make it empty. Originally I wanted to mount the wood with clamps to the table but with the box I can just put it on the table for small pieces. It saved me real 50 EUR I guess and brought the moreless not used saw into working conditions back.


First think – No first aid!

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Repair Carl (mobil repair station trailer) Webinar 19.12.14 18:00 MESZ

I was also participating on creating the local repair cafe initiativ in Freiburg. So actually we found a room and the group consisting of repair enthusiasts is stable. Every last Saturday in month we are open to repair stuff the people bringt ot us from 14:00 to 17:00 o’clock. I realy like the location it is in a elderly dorm where all these old people sitting in the background watching us repairing stuff which is most of the time younger then they are. Its realy crazy and gives the room a real special spirit.


Well I just wanted originally to mention that we get funded from anstiftung for the Repair Carl Project. Repair Carl is the Vision of a mobil repair station bike trailer which we are now planning to start. For that and to get as much response as possible in the beginning of our project we organized a webinar with anstiftung to realy get out the needs for that. So I welcome any part of people which are interested in Repair Carl to join our webinar at 19th of December at 18 o’clock (MESZ). The plans for Repair Carl will be open source hardware and hopefully a lot of repair cafes fall in love with this smart idea.

cu online




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Carla Cargo bike trailer presentation

On Monday (08.12.14) I did hold a presentation with a review and an outlook of the carla cargo project in front of students from the class renewable energy management at Uni Freiburg. That was realy intersting to see the project from other perspectives espacially with international background. Also for international folks its possible now to get a clear status of our project where we are and where we maybe wanna go. Just watch the youtube link.



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carla cargo prototyp first test drive

As I said. A lot of thinks happening around me. So we did bring our carla cargo prototyp to a stable beta version. That means there still a lot of little bugs or nice to have ideas but well this prototyp is moreless a stable workable version. I did cut a litte video from the first ride so enjoy and hopefully it will be seen now a lot of times in Freiburg.


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Video from the Elevator Pitch BW in Freiburg about the Carla Cargo Projekt

Hi folks. Here is the Elevator Pitch Talk from Freiburg where our Project Carla Cargo did participate. We did win the second price and also got a wildcard to battle again with a chance to get glory and 3000 euros in cash. Well it was definitly my first chance to convince so many people in one room about the carla cargo idea. I will try to give my best on the next battle to bring the idea forward.


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I am back…

…whu well I dont know how much times I did say this on this page. So I was never away I would definitly say. The thinks which are going on actually brought me back to my old and dusty blog here. Well I wanna try to publish here more of the actuall stuff I am doing & building. It will be a chance for you to interact on certain points with me and helps me of course not to get lost trough all this projects. So enjoy the show.



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raspberry pi webradio with mpd and mpc via linux shell and droid for android


Even when the audio quality from the raspberry pi on board audio card is maybe not that excellent it is still much better than the bad signal I get so far away from my favorite station in town radio dreyeckland. I did make me a fully functional Web Radio from a raspberry pi. Here are some useful steps to get into it…i love it…

You should first check if your on board sound card from the pi is working well:

aplay /usr/share/sounds/alsa/Front_Center.wav sudo nano /etc/mpd.conf

If it is not playing a sound you can visit this Troubleshooting page to get solved the problem.

Having sound you can start installing mpd which is a music player daemon. To connect to the daemon you need a client. There are really a lot of available clients for any computer system or mobile phone. I started with the shell client mpc.

sudo aptitude update
sudo aptitude install mpd mpc alsa-utils

Lets configure something.

sudo vim /etc/mpd.conf

I removed everything in the file and simply entered the configuration from elecc. Maybe make a backup from the original file.

music_directory "/var/lib/mpd/music"
playlist_directory "/var/lib/mpd/playlists"
db_file "/var/lib/mpd/tag_cache"
pid_file "/var/run/mpd/pid"
sticker_file "/var/lib/mpd/sticker.sql"
user "mpd"
input {
 plugin "curl"
audio_output {
 type "alsa"
 name "onboard"
mixer_type "software"
audio_buffer_size "4096"
filesystem_charset "UTF-8"
id3v1_encoding "UTF-8"


sudo service mpd restart

and create a playlist where your radio streams will be inside

sudo vim /var/lib/mpd/playlists/playlist.pls

like this

Title4=Radio Gong

Be careful not to insert urls with .mp3 or .pls ending. Simply download those files open them in a editor and take out the real link to the stream.

Look if mpc is working


well. If yes something like this should appear.

volume:100% repeat: off random: off single: off consume: off

To load your radio playlist make the following

mpc load sender.pls
mpc play 1

The Number links to the radio station you have defined in the playlist.pls file before.

To stop the play

mpc stop

And some realy important especially if you playing around with adding new radio station is to clear your playlist before loading a new one. If you do not the mpc client will overloaded again and again with same playlist.

mpc clear

The cool stuff now is even that you can connect to your mpd daemon via your android smart phone. I installed Droid MPD Client from the Play store and simply configured the server address to my pi IP. To get out your IP from the PI you can type


Well that’s all and now I am looking forward going more into hardware details creating me a fully web radio like plingbloot did it.

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Raspberry Pi as dhcp-server on eth0 via wlan0

I have a small hackerspace in my cellar where I have a lot of old pc’s which I use for testing and programming. Cause my Router ist upstairs and I don’t wanna make a hole in the wall I created me a dhcp server out of a raspberry pi which is connected trough wlan to my Internet. I found a well descriped method in german here from gehaxelt.


 Network Interfaces

There we must configure 2 devices:

  1. Wlan0 (trough Wlan USB Stick) which is connected to the Internet and gets the IP from the DHCP Router
  2. Eth0 (onboard Lan from the Pi) which is getting the IP static


Eth0 is taking the IP but you can choose any other IP Configuration. You should check before if this IP ist used in your local Net. You must edit your “Interfaces”:

sudo vim /etc/network/interfaces
auto lo
iface lo inet loopback

#wlan0 connected to internet
auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
wpa-ap-scan 1
wpa-scan-ssid 1
wpa-ssid "yournameofwlanSSID"
wpa-psk "yourpassword"

#eth0 onboard lan
auto eth0
iface eth0 inet static

After updating the interfaces file I did have to add the IP to eth0 trough the shell:

ifconfig eth0

So I could make a restart of networking:

sudo /etc/init.d/networking restart

A normal restart did bring me later the dhcp server not to run.


 Configure DHCP Server

sudo apt-get install isc-dhcp-server

For your DNS Server which administers all the IPs to the names I recommend you to first use the google Namesserver. You can keep it but you can also change later. You normally should find trough your configuration page from your router.

A testping to the DNS should definitly work well:


After installation of the dhcp-server you must configure the dhcp configuration:

sudo vim /etc/dhcpd/dhcp.conf

I think the fastest is to uncommit everything and put this code here on the end:

subnet netmask {
  option broadcast-address;
  option routers;
  option domain-name "local";
  option domain-name-servers,;
  default-lease-time 600;
  max-lease-time 7200;

Make a restart:

sudo /etc/init.d/isc-dhcp-server restart

Hopefully it starts without any problems. If yes you can look for the logfile:

tail -f /var/log/syslog

When everything went well to this point you should be now able to connect any computer with LAN cable to the raspberry pi and it will generate a IP for the computer. What is still missing is the routing from the Internet to your eth0.



You should perform the following actions:

sudo echo 1 > /proc/sys/net/ipv4/ip_forward

Open the file:

sudo vim /etc/sysctl.con

and remove the # from


and finally add a roule to the iptables as following:

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

Now it should be possible to get a internet connection trough the LAN cable on the raspberry pi.

Fix it for reboot

mkdir /home/pi/router
cd /home/pi/router
sudo iptables-save > ./iptables.tbl

shell script

sudo nano /etc/network/if-pre-up.d/iptables



iptables-restore < /home/pi/router/iptables.tbl
exit 0

and change the rights

sudo chown root:root /etc/network/if-pre-up.d/iptables
sudo chmod +x /etc/network/if-pre-up.d/iptables
sudo chmod 755 /etc/network/if-pre-up.d/iptables

Thats it. Have fun. Next time I will gonna try to make a onion pi.

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