Audio and Battery Upgrade


Here are the latest news.
I worked on a lipo battery system, charging option and a audio amplifier.
The battery system works great. I use a 7,4 V 2 cell lipo battery together with a simple balancer charger circuit.
I installed a voltage regulator for 5V and soldered everything together on a stripboard.
The Audio amplifier is a standard circuit with a tda1519 ic.
I installed two small speakers inside the cube. So everything fits inside.



First real plastic sample

Well, this is my first handmade sample of the RaspiCube and as you can see, it works. It’s made from white polystrol plastic.

There is some tape instead of the screws. I`ll change it on wednesday.

The next thing on my todo list are the audio amplifier and speakers.

There is enough place inside of the raspicube so it should not be too hard.

pre cube tests


First tests with plastic board mounts and a first display frame.

By the way, i use only one 2A 5V Power supply for the raspi, 4 port usb hub and the monitor.

Top and bottom are just some plates from my hobby parts box.

Optimizing resolutions of the monitor

For all of you guys out there using a small video display like this, it tested some different resolutions.

I found something really nice!
Open your nano editor in the Terminal and edit the :

as sample:  sudo nano /boot/config.txt
Then we have to activate (You can activate something if you delete the # in front of a function).

# Overscan

overscan_left 0

overscan_right -18

overscan_top -22

overscan_bottom -14
Change the Resoultion for clear types:


For Games like open arena or super tux it would be better to change the resolution to:


STRG-X will closing the nano editor and asking if you like to save the changes or not.

You can save two of these config files and don`t forget the reboot after changing 😉

After reboot the display should be without black bars around.

searching for a cheap small 3,5 inch monitor

Well, after some research on conrad (german radio shack :-)) and ebay found something.

This small display uses the video connector. So it`s not too sharp. But small, cheap and really bright.

The price was about 25 € including shipping and vat.

This picture is not too good. The display is sharper than it seems.

Display mug

Yes, i started Open Arena 🙂 of course just for the test!

Well, i have to use my screwdriver….

Well, here is just the panel with driver board itself.


It`s really small and has 2 screw holes on each side for a easy fit.

Configuring WPA2 using wpa_supplicant on the Raspberry Pi

By the way, this was extremely helpful getting my wifi dongle running with a hidden wpa2 connection running wheezy.


To use WPA2 pre-shared key on the Raspberry Pi, you will first need to add a network configuration to “/etc/wpa_supplicant/wpa_supplicant.conf”. Note the lack of space in “network={“.

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev

    ssid="Your SSID Here"
    pairwise=CCMP TKIP
    group=CCMP TKIP

After you have modified wpa_supplicant.conf, you will need to change the “wlan0” section of “/etc/network/interfaces”. For a static IP, it will look like this:

# allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet static

For DHCP, it will look like this:

# allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp

After that, you will need to bring up the “wlan0” interface using “ifup”:

# sudo ifup wlan0

You may have to bring the interface down and then back up:

# sudo ifdown wlan0
# sudo ifup wlan0

You may see messages like this:

View original post 145 more words

First drawings and a paper cube


after some drawings later, i decided to create a paper cube to see how it could fit all together.

I will upload some Pictues of the drawings later as well as some ideas about a small circuit board for the power,

external connectors, power-on button and a secondary video out-out.

Maybe it could be helpful to put a audio amplifier on the circuit board?

Update 28th of april: Working on a audio amplifier…

The Idea