Audio and Battery Upgrade

20130428-025509.jpg

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.

 

20130502-121250.jpg

Advertisements

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

IMG_0496

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 :

/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.