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.
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.
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.
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 :
/Boot/config.txt
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:
framebuffer_width=480
framebuffer_height=400
For Games like open arena or super tux it would be better to change the resolution to:
framebuffer_width=640
framebuffer_height=480
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.
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.
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.
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
update_config=1
network={
ssid="Your SSID Here"
proto=RSN
key_mgmt=WPA-PSK
pairwise=CCMP TKIP
group=CCMP TKIP
psk="YourPresharedKeyHere"
}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
address 10.1.2.20
netmask 255.255.255.0
network 10.1.2.0
gateway 10.1.2.1For 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:
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Well,
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…
