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Hello!
I have made a lot of work on the project, with great help from Doru Ignat(idorel@gmail.com) and now the complete list of features is:
- latest Raspberry PI firmware(which supports new models and has fixes for analog sound - no pops any more, you can use the analog out of RPI)
- linux kernel 3.10.30 with various touch screens support and also lirc
- reworked XBMC CarPC skin
- XBMC 13 Gotham beta3(1080p video support, any music and picture format, support playing from archives and more)
- reworked XBMC touch screen calibration algorithm
- XBMC calibration plugin for touch screens(eGalax and others)
- reworked FM Radio plugin
- latest Navit build from source
- fixed Navit to alllow using espeak for speech guidance
- support for WIFI(Airplay, XBMC remotes)
The latest image can be downloaded from the right side of this blog, from the
Downloads page.
Cost of the needed hardware parts: 193$ -
Raspberry PI model B: 45$
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7 inch display with touch screen for car reverse: 80$
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HDMI male to HDMI male golden plated cable: 5$
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8GB SDHC card: 6$
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5V(2A) micro USB charger: 3$
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Columbus V800 GPS module(or any other): 37$
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SI4703 FM Radio breakout board: 13$
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2 rotary encoders: 4$
After installing the image on an sd card, you have to configure the system for your needs.
Calibrate the touch screenThe touch screen calibration involves two steps and you need a keyboard connected:
1. Calibrating the touch screen for X11 applications(like Navit). Open the terminal from Desktop and type xinput_calibrator and follow the indications. After the calibration is completed you have to put the output in a file to make this permanent:
sudo nano /usr/share/X11/xorg.conf.d/01-input.confPut here the output of xinput_calibrator. It will be something like:
Section "InputClass" Identifier "calibration" MatchProduct "eGalax Inc. USB TouchController" Option "Calibration" "121 1917 317 1741" Option "SwapAxes" "1" EndSection 2. Calibrating the touch screen for XBMC. In XBMC use the keyboard to go to Programs/Touch Screen Calibration and follow the informations on screen.
Note, that in order to make a better calibration you can move the finger on screen towards the point, before pressing enter(as can be seen on minute 0:52 in the video).
Touch each point and then press enter to go to the next one. At the end, you have to unplug the touch from usb and then plug it back(works on XBMC Gotham).
After this, he calibration is stored permanently in the file /home/pi/touchscreen_axes_calib. You can edit this file to fine tune the position of the cursor if the calibration isn't perfect.
calib_x_d and calib_y_d - control the cursor displacement up/down/left/right
calib_x_fact and calib_y_fact - some factors obtained in the calibration process(don't edit them)
click_confines - defines the area that will be used for click(if the touch moves outside of this area then a drag action will occur) - this area is measured from the first touched point
touch_mouse - if you want to use a mouse you have to set this to 0, but some touch screens behave as mouses and you have to set this to 1 in order for them to work(with single click). For the most of the touches this can be 0 if you want to also use a mouse, but if you don't want to use a mouse it doesn't mater, let it be 1.
